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Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA. Cc. S />'f

Professor Dr. Carl Ludwig Siegel

geb. 31. Dezember 1896 gest. 4. April 1981

Gettingen

Auf Wunsch des Verstorbenen hat die Beisetzung in aller Stille

stattgefunden.

1m Namen der Freunde und Schuler:

Theodor Schneider Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

NEI' YORK TI~!ES. 15 April 1981

Prof. CarlL Siegel, 84; LeadingMathematician

Prof. Carl LudWIg Siegel, one of this century's leading . died April ~ in GOttingen, West , at , the age of 84. He made fundamental dis- 1 covenes in the theory of numbers, the 1 theory of analytic functions and celestial , m~~. I Professor-Siegel ..... born in and . at the age of 2S was appointed to a !ull : professorship at Unive"'ity ~ he was a member of the faculty I from 1922 to 1937. He was then a profes50r at Glittinlen University until he left Ger­ many in 1940 to join the Institute for Ad- ! vanced Study in Princeton, N.J., where he remained as a member conducting his own research untl1l945. In 1941i he was appointed a faculty member of the institute and took part in ~ sdmlnistrative and policy-malting func­ tions. While there he also served as an ad.­ junct professor of at New York University. Professor Siegel remained with the in­ stitute until 1951, when the Government of invited him to accept a chair at the University of GOttlngen. He was professor emeritus ot mathematics there at his death. In 1978, Professor Siegel was one of nine leading research sclentists who shared the $500,000 Wolf PrIze, estal>­ lIshed in 1976 by the Israeli Parliament. Professor Siegel ..... cited for his work in the theocy of numbers, complex vari­ ables and celestial mechanics. He leaves no Immediatesunivors. I Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

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n ber 22l1ll. 1960, alter CO!18UltaUOD .1 t.a n ftont~17 _ .U. Dr. Op~ told 1Ir. "orpa tbat. tile cnn\.-l..u to Pl"afumr Step1 t. ta.. a 7NI' 1960-1961 8boul4 be abarp4 to tile na,__tlca,= Stipead tuncl 1newad or • latloDal Sa1. OUDdaUOD t tor the aupport ot wo 1n cal,yea. Prot••ear S18 el latt the lnaUtata at aDd of a tint ta ot 18 Jear. '1'ba total paid to b1Ja wu 500.

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Co tol!fr. I'tlr-.. ft1aa lINiar.....t Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

cc 1'1r. !'forgan iss ndenrood

2 00 1"1960

Dear Prot.. 01" s1.celt

ThU 1a to cont1.nl our ~14 nt that 1OUJ' t1naDc1al nppoz t tor Ul1a Tear will der1: t a ennt to th. '. lnetitute t'rolII til. ational o18QDe Fo tion, tor • • port ot 1IQr in analT-1•.

T1Ie J'oundation lIP c1a nt ot 1 contribution in publleat10 ot daDe dUl'inl TOur te ot 10, or a. a resUlt of work do tile. '1'haT ald be glad to ha ottprinta ot aueb ileationa. and we ratora that 1'011 s d to ia 0' rwood one COPT ot preprints. 8DI1 .ix copias ot 1" print J eo at e ~ t th_ to • FoundaUc •

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Prc1!••1ICl11" Carl L. S1. 'ftla IJllltit.ute fbr .ldTaDcec1 Stu

('1$ - 6- Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

cc: Mrs. Barnett cc: Beurling Borel G&l.el Morse ...... OppenheiJller selberg Weil Whitney

Gllttillgen, May 3, 1960

Dear Montgomery:

I vas pleased to get your kind letter. In the meantime I have already written to Mrs. Barnett asking for the reserntion of an aparwent.

I have a berth on the "1ll'ell8n" arriVing in Nev York on October 17, and I should be very gratefUl if the Institute station vagon could Met ae at

the boat.

Please convey to Veblen ~ cordial wishes for his recovery.

I am looking forward to see you again in a fev a:>nt s, and I

hope that it will be a pleasant tiJIle for all of us. Sincerely yours,

/s/ Carl L. Siegel Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

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cc: A. Borel K. Glldel D. Montgomery M. Morse .,/R. Oppenheimer A. Selberg A. vleil H. Whitney O. Veblen TATA INSTITUTE OF FUNDAMENTAL RESEARCH Apollo Pier Road, Bombay 1

February 15, 1960

Dear colleagues Beurling, Borel, Glldel, Montgomery, Morse, Selberg, r/eil and Whitney:

I was very pleased to receive your friendly letter and tbe nice gift which accompanied it. Certainly I should like very DDlch to visit you when I come next time to the .

Perhaps I may add a few words explaining 1I\Y negative answer to the official invitation. I was frightened by the idea that 1I\Y stay at the Institute for a longer period of time would not be welcomed by the younger generation of mathematicians whose scientific taste and interest seems to be very different from 1I\Y own. It is quite possible that the abstract dreams of these people ultimately may lead again to fertile ground and to real progress. However, I feel unable to adapt 1I\Yself to this modern spirit, and I prefer to continue 1I\Y own work in the style of the 19th century.

There is a second reason which I did not mention in 1I\Y letter to Dr. Oppenheimer. During the last years 1I\Y healtb has become very unstable and I was afraid that I should find great difficulties in trying once more for a year the uncomfortable life of an old bachelor in America which I know so well from long experience. Such difficulties might not arise during a shorter stay, but I did not feel free to propose another form of intitation.

Thanking you for your kind intention, I remain

Very sincerely yours,

/s/ Carl Ludwig Siegel. Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby\ White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

TATA INSTITUTE OF FU DAME TAL RESEARCU ~~ National Centre afthe Government of India for Nuclear Science and !tlalhemalit:s

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Note to File

November 17, 1959

Today Professor Weil informed me that, in a personal letter to him, Professor Siegel had said that he hoped to be able to come to the Institute next year if his health allowed. Professor Weil thought it unlikely that Siege! would make a formal answer to the invitation for some time.

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'. Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

r File ce: J'!Mbers, 60-61, Siegel ~ r FacuJ.1ir, Siegel Bd o~ Truatees, pending

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• Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

CC I Professors Beurl1n& rel C&lel ntgo ry Moree vt)ppenbe1ller ell Whitney

Ollttingen, ovBllber 9, 1958

Dear Professor selbergl

Thank you for your kind letter which I r delay because of II;Y abllence frOIll Ollttingen ffillC"1nlll

Next year I shall retire frOIl ar:r l)O!rHi~ April 1st. I shall keep the right to gt e here, if I wish, though I doubt whether I shall do so~ pr t disagreeable situation at our Institute. ;f ot.1ilm , lIlY alth is rather unstable, and it would not be wi 100 tri nee IlOre to find a n .'-" home in another part of the world. V I should be glad if ~ the acadeJll1c year 1960/61 at the I.n8titute for Adv Stu. ng the winter 1959/60, as you probably know, I s be II~ t1JI8 10 Bombay, because of the ColloquiUIII on Fun on~,,oo I would not. dare to expose my bad health to t yurer~~tes of three continents. Please giv bea;;r ardll to Mr.. Selberg. Sincerely yours,

/11/ Carl Siegel Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

cc: Professors BeurliIlg Borel G8dill Montgomery Morse ....-o-ppenheiaer WeU Whitney

GllttiIlgen, Nov8IIber 9, 1958

Dear Professor ~lberg:

Thank you for your kind letter which I rec i~ed with some delay because of II\Y absence trOll 06ttingen during t~ last month.

Next year I shall retire fro. rq po(:I:t1en~'Gllttingen on April 1st. I shall keep the right to ~he lectures ~e, if I wish, though I doubt whether I shall do so utider the prese~'{ disagreeable situation at our Institute. On the other baJ1.d, rq health is rather unstable, and it would not be wise tQ W qnce more to find a new home in another part of the wor

I should be glad if I could spend academic year 1960-61 at the Institute for Advanceli \StUdy~ing the winter 1959/60, as you probably know, I shall, ~o~ illle in Bombay, because of the Colloquium on ~'The

Please give -f est ~s to Mrs. Selberg. ~ Sincerel,y yours,

/s/ Carl Siegel Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From rthe Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

NEW YORK UNIVERSITY : WASHINGTON SQUAltf NEWYOIUC N Y.,OOOl Return Requesled

t~!ce of tne ir _tor .ril'l'; :'0 • ew ersey Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA. MATHEMATICS COLLOQUIUM - NEW YORK UNIVERSITY Courant Institute, 251 Mercer Street Monday, April 10, 1967 Room 109, 3 - 5 p.m. Professor Carl LudWig Siegel of University of G~ttingen THE WEIERSTRASS PREPARATION THEOREM This is a special Colloquium. Professor Siegel will receive an honorary degree at the conclusion of the Colloquium. Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

THE INSTITUTE FOR ADVANCED STUDY

PRINCETON, NEW JERSEY

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The 31 tio of • "1 IlIlll:lbor of Faculty or the nstitute cep1;ed the end of our pre ent !'i cal ar, JUne )0, 1951.

obert Oppenhsillier

Copy to •• Trim81'\ld nss UnderlfOod Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

March 22. 1951

DMr Prof"essor Siegell

Your good letter of ch 21st came to _ this morning. Although it has news in it which. lLS you knOlf. makes e en your friends here sad. I must thank you for the oandor and the riendliness with which you wrote. It is surely true U'at e are content tha in one way at. least t Institute has fulfilled ita real .function and provided a home for you durl so 0 )'Oars in lIhich you have e such DlUsive and beautifUl contributions to sciencs. That is what we are here for.

• As to the future, _ must of oourse wish. far the sake of your OIIII happin.. and oreativeness, that the decision you have now taken return to 08ttingen will prove a wise one. If. when you have bad ti to lLSsess the situation in 08ttinven. it should tum' out that you re ret the decision, or would in any _y wish to reoonsider it, you IIlUSt surely then let us mow. in order that _ uy reopen the question of" your return. I say this despita the good wish.. that go with youJ0nly that you ay be sure of my eagerness and that of all your oolleagues to be helpfUl to you within the limita of our ability.

ith every warm cod wish.

Robert Oppenheimer

Professor Carl L. iegel Institute for ·dvanced Stu1y Princeton. • J. Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

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J r Oppenheimer:

The last Mortgage payment has been ~de on

the Siegel house; pending a little paper work the

place is his.

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s.:...... ,v,. ~, e--t. i-.~ S.R.~. I Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA. • • NEW YORK UNIVERSITY GRADUATE SCHOOL OF ARTS AND SCIENCE

WASHINGTON SQUARE

NEW YORK 3. N. Y.

OFFICE OF THE DEAN TELEPHONE: SPRING 7·2000

April 28, 1950

Professor Carl Siegel Institute for Advance study Princeton, Nell' Jersey

~ dear Professor Siegel:

Professor Courant told me that you prefer not to receive further payments from i ell' York University, in view of the fact that you had to miss a number of class meetings and that your actual ex­ penses have been covered by the payments received so far.

It is only with great reluctance that I comply with your request.

The University is genuinely grateful for the help and inspiration you are giving to our Graduate st.nents. We feel that the ",ayment offered you is only a token expression of our appreciation.

In accepting your generous offer I want to express our nope that in the future you will continue to lecture for our Mat .e:E.tiC5 r:ept:nent in an informal way. Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

Dec • 19, 1949

Dear Prof? ~or iegell

It is a plea ur f r me to inform you that at it ccotin' of !kl'179II1,er 15, 1949, the Executive C ttee of the '011 of Truste of the In titute for A vanced Ct\ldir adopted the follClllin.:: re~oluti n:

It !l ovet.l and carried thnt, operative ss July I, 1 SO, the ::1ni= total ion of pre ent full In: titute ofe- sor ho Id be 0001 that the obligation of the In: titute is to provide the c11fferene between thi ll.ClOunt an th pen ion provide throu h insursn eJ th t th additional ,-menta sh uld be covered in the rdinary et.

TIus, under the t of thi resolution, t e av ila le to you frOlD the TI policy wh1 h you now hol will u 1 ted the In'ltitute to b n'" the t tal to • a year. The Tru t s qf the n: titute w: e tand that in 0 es e a profe or. de~ire to k rovi ion for the support of hi wife in the event of hi death. In neral, the In~t1tute will allow sch Nfes or to ex .rei e this option with re ard to it contri- tion to his ir nt allowance, and in eneral a cordance with e t of options L'l ta lished by the IAA.

J.DCO 1)',

Robert .llhe1J:ler Di etor

Profes~or Carl • e 1 •

t'1 Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

THE INSTlTIlTE FOR ADVANCED STUDY PRINCETON, NEW JERSEY

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~ .. Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

Vq 31, 1949

Milltar,r Pemit OrUce firchenfeldstrasse 78 Demo, Rwitzerland

;entllemcn:

Proi"essor Carl iej;el, the tearer of tbis note, 1s a permanent me bar or t.e aculty of the School 01" tilematics at the Irr-titute for d­ vaneed ftudy.

• It is Profesaor Siebel's hope that he vdll be able to visit his !:lather, • Bertha Siegel, in r.crlin this su:mner. • riegel is seventy-five year~ old and has been seriously ill for I:lOnths; she has no f'amily except Profes~or riegel and he feels that unle s he can 8ee her 800n he will not see her again.

e sincerely hope that evezy consideration will von e"'sor Siegel' 8 reque'Jt for pcr:nission to go to rerlin this sUl:l:ler.

Yours sincerely,

Robert Op nheimer Director Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

DEPARTMENT OF THE ARMY Ple' se refer to MIUTARY PERMIT OFFICE c· se 11839 WASHINGTON 2!S. D. C.

B larch 1949

. s. Jor~ D. Leary The Institute for r~vanced Study Princeton, He Jersey

Dear ~rs. Leary:

Thank you for your letter of ~ch 1st con­ cernin~ rrofessor Siegel's ~roposed visit to Berlin. L cable has been dispe.tched today Lbout his case and ,Ie have asked for an early re~ly by cable.

I T:ill write to you ag..in as soon as a reply i~ received. Yours sincerely,

£. T ·.~T_ill lL. ~ili~-y Pernit Officer

AT/OS Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

~cb 1. 1949

• Dear Ill'. Jbaa·-1r1lUll r. Opp iaer • 04 •• '0 4 lOU \ .noloeell app11 \10R for p.r.l.~10a for Prof•••or Carl 81...1 '0 CO '0 Jerlta. !h1. te 111 r ..p RBe '0 10v le'ter of J.bl'Uarr 18\h. A copT of \he Dl.rec'or'e 1""1' referr111C \0 Usia appll.oatloR 11 alao ellCloa.4• • Slllcerel, Toun.

(Hre. lohn D. Lear,> A14. '0 'he D1r.c\or

Ill'. A.I. lba ll..1r1an 1I111\arr P.r.1\ Office Depar\.IIl' f 'he Arar Va1lh1ac'on 25. D.C.

Enct~eed: Pas8por\ Bo. 138384 Money Order for $3.00 Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

DEPARTMENT OF THE ARMY MIUTARY PERMIT OFFICE WASHINGTON 215. D. C.

18 February 1949

The Institute of Advanced Study Princeton lIew Jersey

Dear • 0p?"nheimer:

Thank you for your letter of 11 February 1949 con­ cerning Professor Carl Ludwig Siegel's mother in Berlin, Ger­ many. As you know the blockade of Berlin =kes it difficult for visits to that city. VIe will, however, upon receipt of the enclosed application form, completed by Professor Siegel, send a cable to our authorities in Berlin requesting that Pro­ fessor Siegel be allowed to visit his mother.

In addition to the application form, it is also re­ quasted that Professor Siegel be asked to forward his pass­ port to this office with a money order for ~3.00 made pey­ able to the "Military Permit Office".

Yours sincerely,

AKK/ms Encls Appl fIn Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

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April 7. 1948 Siegel. Carl Ludwig Studied Univs. Berlin and G8ttingen Dr.Fbil. 1920 cettingen Born Dec.31.1896. Berlin, GeI'llWly Citizenship - ¢~## Naturalized USA '

Fositions held: 'lamburg liniv. -Lecturer 1920 G8ttingen Univ. - bst.to Prof. Courant and Privatdozent 1921; Guest Lecturer 1930; Frankfurt Univ. - Prof. 1922-37 /Prof. 1938- RFSIGNED; Vis.Prof.winter 1946-7 Rockefeller Foundation Fellow 1925 !AS (and Princeton liniv. spring term 1935); Stipend 1940-45; Professor Oct.l/45­ (On leave 1946-7)

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THE INSTITUTE FOR ADVANCED STUDY Founded by Mr. Louis Bamb

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ONE TWENTY FIVE PARK AV~~UE

NEI'l YORK

Office of Samuel D. Leidesdorf

September 26, 1947

Dr. Frank Aydelotte The Institute for Advanced Study Princet~n, Ne Jersey Dear Dr. Aydelotte: Ie ~f the 25th, age on Pro­ in1ng r ormelly bar 9th, but the Ilssumrytlon

With reEar s, I am

S. D. LEIDESDORF

Original )? Professor Siegel Cooy to~r. Oppenhe1mer Miss Trinterud Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

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July 22, 1911-7

Protpa r C 1·. 1 Care ot Prot seor d Bohr Ret ,., . II! Ii t~. 2 Coppnh n I., De • DP 81 e1:

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r t ri and I equ t a lthy Ute ln Pr1 l' mo p 8 or-tors. our 11' v o not 'orr:; bout the r 8 ls exten I'd s s at r B su tlme 1e to r Llrn I hope 1 be oon. t Dlreotor 1p ln brut lone and I o ~lt 1 w th dootor tusain Untortun tp.ly. I nev r aeem to nd 00 e • t e only n p"'oe Blve perl ot war and Btr 1n h 3 o tt t Conr.e t1 t to orrow tor I s 1 mea strenuous etfort to repalr ou nd lU • Br n ~l b.. arriving 1n my return.

1 th kinde t reg I to you both and to bot ot the !~hrs. I am Yours sinoere1y,

J'r nk Aydelotte Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

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Oopy to: Professor Alexander Profsssor Einstein Professor Morse Prof~8Sor yon Neumann Professor Veblen Profe88or ...,.1 Mill Blake Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

COP Y

egensen st. KAnnikestraede 2 Copenhagen 7 - 7 - 1947

Dear Veblen 1 I write to you to tell you more detailed about Siegel's serious illness of: which you already may have heard. For about a month ago, he went to the hospi­ tal to be operated for a doublesided hernia. :rhe operation itself went well, but a few days after he bot pneumonia in one of: the lungs which, however, in some days got cured by help of penicillin. Shortly afterwards he got a new attack of pneumonia, this tiJne in the other lung. And now the medicine did not really work =ymore so that he was rather ill. :rhen when the fever finally went down his pleura was inflamed and, as he was rather weak, the situation began to be danger­ ous. At that time I was sorry to leave Copenhagen to go to a colloqu:i-.nn in Nancy, and while I s away there oame some trouble and the doctors were seriously afraid that he should die (besides the surgeons at the hospital, "iels during ~ abse~ce got also a professor of intern medicin to treat him in order that everything possible could be done to help him). After some very dangerous days it looked, however, as if he should overcome his illness, and when I returned he was so_­ what better, even if he was very weak indeed and the situation still rather critical. rOll', fortunately, the doctors hope that he shall recover in not too far a future, but naturally he still will be very weak for a rather long period. At the ole he has kept up his spirit very well even if he e quite clear how ill he was. But of course sometilllfls he teels rather depressed after all these sufferings. e hope that he in a rather near future will be well enough to come out of the hospital &ad go to a recreation place somewhere in Denmark, perhaps if the journey is not too strenuous -- and also, as he naturally wishes to be together with his Danish friends, llielsen, Jessen, Fuchel, etc. During his stq in the hospital he, when he is not dozing, naturally speculates over many things and among others he feels very unhappy that his friends in Princeton should think that he does not feel his responsibility towards the Institute strong enough in case he -- what seems to me not quite improbable -- shall not be sufficiently restored to go to Princeton in due time for the beginning of the semester. I Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

hAve tried to make it quite clear to him that this is nonsense and that his only and obvious duty both to himself, his science and the Lnsti ute is to recover completely and not mnke this recovering still more dif1'icult by absurd epecula­ tions 01' this kind. I think thAt it will make Iilin good when I tell him that I hAve itten to you and both told you in detail about how seriously ill he 1ul.s been and still is and asked you -- what I there1'ore hereby allow me to do -- to tell to the other authorities at the Institute, 1'irst of all to delotte, about t e content of this letter• • y I allow to add that I hAve the feeling that in legel's weak- ness a kind letter l'rom you _yean very much to him indeed, both in itself and also in order to rele se hi from all kinde 01' absurd speculations of the kind mentioned above. As most of the De.n.i.sh mathemat cians hAve gone on holi­ days only Jessen and I remain in CopenhAgen and we, together with ss Braun or whom we all hAve the very best impression, are daily visiting him in the hospital even if we are only nllowed to stay rather shortly in order that he shall not be too tired. As I should like to send this letter alrea~ this evening, and it is rather late, I fi.liiSl it without telling you about other things, such as the Congres in France, etc. ith kindest regards to you and s. Veblen rrom us all

Ever yours

/s/ Iiarold Bohr Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

BROOKLIN

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BROOKLIN Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

COpy COpenhagen, July 4, 1947 Dear 55 Illalcel Beat thanks for your letter which came 80 8 ago. Since you IV' :Ulne through Dr. ~t.te, I ot ch brought V8 to :tho I IlU.LU:1U8 eml:oJj,e ot the 8, 110 r 'tocat.1cm, thoUl;h I 8 a at - but I rec:cmar8l1l. • • I first I r • I wrote to t Inst1t • • t • v,,"'nnlIl?

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bUtut. tor A4ftDcecl StadT oetaD, .J. 10 J~ 1947

Dear 51 1:

IIS'!'Jake baa j t aJ101md .. ur letter of 4 I am I buten xpr 6 profo w1~ u in all tbe 10 u h ft had 'to Ullde , • eretan4 :your reeling deJlreSS41d tId of JOur letter that. ur e,r,.rl~l.ell CIO , and I bopa t. II 1': Iklntha r 1 IItraJ'l\lOUII re in iDe.ten ill put y:Ju • •

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May 7, 194-7

Prot 8 or Carl L. 81eg 1 o re ot Prof& Bor Harald Bohr Rf> U :1. at. ckeetr. 2 Copen. 'n _., en .rk , De"r .• J tter of K!iy 1st nd /let to to do ev 17th1 to opt n a vis I L.1 c-'ry ot a let them to 1n tr :Jd I am at th ~ h thr u v r. opt1m1stic about ~ _ "lnd of thir • our 0 n ettnr nm r' and I e sler.

t .. t both Y:lU • _i1n vith t E" u t me:i.1cal atto-n.i n. I ~fl Y U 1"" ,11 ho if' t.!. tl t'J.t •

I t:tl yo~ "n ~, th t I 'an Gohedu'.. d to r tire fro. the DlrpctorRhl 8 of OctobRr 19' 7. I on t t 'no 'hether I !'lI:ve ~~d t1 to tell you t~e n s that Dr. 0 penhe1ro9r ot the Un1ver 1t' ot 0 11fo~n1 an Los laDos a been elpote~ a8 my suooe-sor. He h! ju t been pero1n few d ya -1 th us 1n Pr1no ton and we are all entousl 9tl0 bout the prospects of the Inst1tute under h1s 1e d r hin. I think Profeasor N1els Bohr "111 b inter£> tE'd. ' Yours a1r.cer 11,

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'- .~__~_~__~ ~__~~_J_~~ ___ Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

January 12th, 1 ~47

Dear (,swald: I am perfectly delighted to see this abstract trom Siegels letter to you. As you see, it is clear cut, and I think e can count on him. ithout any authority, I took the liberty of telling iss iller to oontinue Siegel on full salary, until my return, and I expect to bring the matter up to the executive Co ttee at its meeting in February. Siegel is a funny person. I can think of a very eaay way to get ss Braun into the United States. Th t would be for them to get married lmmediat lYe I see no indioation from his various letters, that he intends to do that, and I propose therefore, to push the matter of her entr nee in the ordinary aYe I ill bot on that es soon s I set back.

le re having 3 onderful holiday, and re only just now realizing how much we needed it. - hope you ~d ~lizaboth are going to get down hero soon. 3incerely yours,

Frank Aydelotte

Prof. Oswald Veblen, Institute of Advanced Study, rinceton, l'ew Jersey Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

THE INSTITUTE FOR ADVANCED STIlDY

SCHOOL OF KATHElolATICS PRINCETON. NEW JERSEY

January 9, 1947

Dear Frank: I am enclosing for your information a portion of a letter dated December 3 from Siegel. I think it shOlrS, permps even more clearly than his letter to you, that he now has really made up his mind. I think the last sentence which I am quoting is very signif­ icant in view of my previous observations about Siegel's strong sense of,responsibility. I think that we m~ find him extremely helpful in the ev~ affairs of the Institute as well, of course, as one of our great protagonists of mathematics. It is, however, clear now from both of our letters that his return is conditioned on Miss Braun's coming to the United States. In view of the slowness of the process that has so far been used toward bringing her over, I wonder whether there is anything that you could do through your acquaintances in Washington? I hope that your sojourn in Florida is proving most delight­ ful. With cordial greetings from Elizabeth and me to lIrs. Aydelotte and yourself, Yours sincerely, ~y~

Oswald Veblen -:1':> Dr. Frank Aydelotte Highland Park Florida Club Lake Wales, Florida OV:GB Records of the Office of the Director: Faculty files: Box 26: Siegel, Carl, 1946-1981 From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA.

Extracts of letter from C.L.Siegel to O.Veblen

Gllttingen, December 3, 1946

Two months have passed since I saw you the last time, the da;,y lIhen I left Princeton, Six weeks were spent on the way between New York and Gllttingen. l!y lectures started two weeks ago - and now I am wonder­ ing how much time it will take to come back to Princeton. But let me first tell you that my visit to Gllttingen was neces­ sary, both from the general and the personal point of view. It seems that my lectures really mean a great deal to some decent people here, in the present situation of confusion and despair. I firmly believe that I am doing a good work for scientific and moral reasons. *,'Hl-H* I am now convinced that my definite place is on the side of my colleagues from the Institute in Princeton, and I shall try, after my return, to be a more useful member of your scientific community than I was during the past. H~ll~ll