The Year of the Internet
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The Sagemanifolds Project
Tensor calculus with free softwares: the SageManifolds project Eric´ Gourgoulhon1, Micha l Bejger2 1Laboratoire Univers et Th´eories (LUTH) CNRS / Observatoire de Paris / Universit´eParis Diderot 92190 Meudon, France http://luth.obspm.fr/~luthier/gourgoulhon/ 2Centrum Astronomiczne im. M. Kopernika (CAMK) Warsaw, Poland http://users.camk.edu.pl/bejger/ Encuentros Relativistas Espa~noles2014 Valencia 1-5 September 2014 Eric´ Gourgoulhon, Micha l Bejger (LUTH, CAMK) SageManifolds ERE2014, Valencia, 2 Sept. 2014 1 / 44 Outline 1 Differential geometry and tensor calculus on a computer 2 Sage: a free mathematics software 3 The SageManifolds project 4 SageManifolds at work: the Mars-Simon tensor example 5 Conclusion and perspectives Eric´ Gourgoulhon, Micha l Bejger (LUTH, CAMK) SageManifolds ERE2014, Valencia, 2 Sept. 2014 2 / 44 Differential geometry and tensor calculus on a computer Outline 1 Differential geometry and tensor calculus on a computer 2 Sage: a free mathematics software 3 The SageManifolds project 4 SageManifolds at work: the Mars-Simon tensor example 5 Conclusion and perspectives Eric´ Gourgoulhon, Micha l Bejger (LUTH, CAMK) SageManifolds ERE2014, Valencia, 2 Sept. 2014 3 / 44 In 1969, during his PhD under Pirani supervision at King's College, Ray d'Inverno wrote ALAM (Atlas Lisp Algebraic Manipulator) and used it to compute the Riemann tensor of Bondi metric. The original calculations took Bondi and his collaborators 6 months to go. The computation with ALAM took 4 minutes and yield to the discovery of 6 errors in the original paper [J.E.F. Skea, Applications of SHEEP (1994)] In the early 1970's, ALAM was rewritten in the LISP programming language, thereby becoming machine independent and renamed LAM The descendant of LAM, called SHEEP (!), was initiated in 1977 by Inge Frick Since then, many softwares for tensor calculus have been developed.. -
Using Macaulay2 Effectively in Practice
Using Macaulay2 effectively in practice Mike Stillman ([email protected]) Department of Mathematics Cornell 22 July 2019 / IMA Sage/M2 Macaulay2: at a glance Project started in 1993, Dan Grayson and Mike Stillman. Open source. Key computations: Gr¨obnerbases, free resolutions, Hilbert functions and applications of these. Rings, Modules and Chain Complexes are first class objects. Language which is comfortable for mathematicians, yet powerful, expressive, and fun to program in. Now a community project Journal of Software for Algebra and Geometry (started in 2009. Now we handle: Macaulay2, Singular, Gap, Cocoa) (original editors: Greg Smith, Amelia Taylor). Strong community: including about 2 workshops per year. User contributed packages (about 200 so far). Each has doc and tests, is tested every night, and is distributed with M2. Lots of activity Over 2000 math papers refer to Macaulay2. History: 1976-1978 (My undergrad years at Urbana) E. Graham Evans: asked me to write a program to compute syzygies, from Hilbert's algorithm from 1890. Really didn't work on computers of the day (probably might still be an issue!). Instead: Did computation degree by degree, no finishing condition. Used Buchsbaum-Eisenbud \What makes a complex exact" (by hand!) to see if the resulting complex was exact. Winfried Bruns was there too. Very exciting time. History: 1978-1983 (My grad years, with Dave Bayer, at Harvard) History: 1978-1983 (My grad years, with Dave Bayer, at Harvard) I tried to do \real mathematics" but Dave Bayer (basically) rediscovered Groebner bases, and saw that they gave an algorithm for computing all syzygies. I got excited, dropped what I was doing, and we programmed (in Pascal), in less than one week, the first version of what would be Macaulay. -
T H E N E T D E L U S Io N E V G E N Y M O R O Zo V
2/C PMS (BLACK + 809) SOFT-TOUCH MATTE LAMINATION + SPOT GLOSS THE NET DELUSION EVGENY MOROZOV POLITICS/TECHNOLOGY $27.95/$35.50 CAN “ Evgeny Morozov is wonderfully knowledgeable about the Internet—he seems “THE REVOLUTION WILL BE TWITTERED!” to have studied every use of it, or every political use, in every country in the declared journalist Andrew Sullivan after world (and to have read all the posts). And he is wonderfully sophisticated and protests erupted in Iran in June 2009. Yet for tough-minded about politics. This is a rare combination, and it makes for a all the talk about the democratizing power powerful argument against the latest versions of technological romanticism. of the Internet, regimes in Iran and China His book should be required reading for every political activist who hopes to are as stable and repressive as ever. In fact, ALEXANDER KRSTEVSKI ALEXANDER change the world on the Internet.” —MICHAEL WALZER, Institute for authoritarian governments are effectively Advanced Study, Princeton using the Internet to suppress free speech, EVGENY MOROZOV hone their surveillance techniques, dissem- is a contributing editor to Foreign Policy “ Evgeny Morozov has produced a rich survey of recent history that reminds us inate cutting-edge propaganda, and pacify and Boston Review and a Schwartz Fellow that everybody wants connectivity but also varying degrees of control over their populations with digital entertain- at the New American Foundation. Morozov content, and that connectivity on its own is a very poor predictor of political ment. Could the recent Western obsession is currently also a visiting scholar at Stan- pluralism... -
Netscape Guide by Yahoo!
Netscape Guide By Yahoo! Now Available New Customizable Internet Information and Navigation Service Launched by Netscape and Yahoo! SANTA CLARA, CA and MOUNTAIN VIEW, CA -- April 29, 1997 -- Yahoo! Inc. (NASDAQ: YHOO) and Netscape Communications Corporation (NASDAQ: NSCP) today launched Netscape Guide by Yahoo!, a new personalized Internet navigation service designed to provide Internet users with a central source of sites, news and events on the Web. The Guide features customizable sections for several popular information categories, including Business, Finance, Entertainment, Sports, Computers & Internet, Shopping and Travel. Yahoo! plans to expand the service with additional categories in the future, including local information. Netscape Guide by Yahoo! replaces the Destinations section of the Netscape Internet Site and is immediately accessible through Netscape's Internet site (http://home.netscape.com), from the "Guide" button on the Netscape Communicator toolbar and from the "Destinations" button on Netscape Navigator 3.0. Users accessing Destinations will be automatically directed to Netscape Guide by Yahoo!. "Netscape Guide by Yahoo! gives Internet users quick and easy access to the most popular information areas on the Web, all from one central location," said Jeff Mallett, Yahoo!'s senior vice president of business operations. "It also provides Web content providers and advertisers a unique opportunity to reach targeted and growing audiences." "Accessible to the more than four million daily visitors to the Netscape Internet site and the over 50 million users of Netscape client software, Netscape Guide by Yahoo! will direct users to the online sites, news and information they need," said Jennifer Bailey, vice president of electronic marketing at Netscape. -
Finding Alibaba: How Jerry Yang Made the Most Lucrative Bet in Silicon Valley History
Parmy Olson Forbes Staff I cover agitators and innovators in mobile. FOLLOW FORBES 9/30/2014 @ 12:55PM 122,847 views Finding Alibaba: How Jerry Yang Made The Most Lucrative Bet In Silicon Valley History This story appears in the October 20, 2014 issue of Forbes. Comment Now Follow Comments Yahoo's co-founder Jerry Yang at the office of his venture firm AME in Palo Alto, Calif. (Ethan Pines For Forbes) Jerry Yang’s Revenge - Forbes, 2014-10-20 Page 1 Jerry Yang is giving a quick tour of the conference room at his private investment firm in Palo Alto, Calif. It’s dotted with gifts and photos from his 20 years in Silicon Valley. Yahoo’s 45-year-old billionaire co-founder stops before a glass deal toy on a low table. “Um, I have no idea what that is.” He peers more closely, checks the date: September 2012. “That is… that was after I’d gone. I think that was the last deal I worked on at Yahoo.” The plaque commemorates what may have been one of the dumbest business decisions of all time. Yahoo’s board agreed to sell 523 million Alibaba shares, half of its stake, back to Alibaba at $13 apiece. Yang hadn’t been so keen to sell. They did anyway. By then he’d quit the board. Sure enough, Alibaba’s IPO last month rocked global markets. Shares of the Chinese e-commerce giant are now worth around $90. Yahoo still has a 16% stake worth $36 billion, but it left almost as much money on the table–some $35.5 billion–as its entire current market capitalization. -
Community and Communication
Community and 12 Communication A large, diverse, and thriving group of volun- teers produces encyclopedia articles and administers Wikipedia. Over time, members of the Wikipedia community have developed conventions for interacting with each other, processes for managing content, and policies for minimizing disruptions and maximizing use- ful work. In this chapter, we’ll discuss where to find other contributors and how to ask for help with any topic. We’ll also explain ways in which community members interact with each other. Though most discussion occurs on talk pages, Wikipedia has some central community forums for debate about the site’s larger policies and more specific issues. We’ll also talk about the make-up of the community. First, however, we’ll outline aspects of Wikipedia’s shared culture, from key philosophies about how contributors How Wikipedia Works (C) 2008 by Phoebe Ayers, Charles Matthews, and Ben Yates should interact with each other to some long-running points of debate to some friendly practices that have arisen over time. Although explicit site policies cover content guidelines and social norms, informal philosophies and practices help keep the Wikipedia community of contributors together. Wikipedia’s Culture Wikipedia’s community has grown spontaneously and organically—a recipe for a baffling culture rich with in-jokes and insider references. But core tenets of the wiki way, like Assume Good Faith and Please Don’t Bite the Newcomers, have been with the community since the beginning. Assumptions on Arrival Wikipedians try to treat new editors well. Assume Good Faith (AGF) is a funda- mental philosophy, as well as an official guideline (shortcut WP:AGF) on Wikipedia. -
Open Source Ethos Guiding Beliefs Or Ideals That Characterize a Community
Open Source Ethos guiding beliefs or ideals that characterize a community Patrick Masson Open Source Initiative [email protected] What is the mission of the conference? …bring smart and creative people together; …inspire and motivate them to create new and amazing things; …with an intimate group of like minded individuals. What is the mission of the conference? …bring smart and creative people together; …inspire and motivate them to create new and amazing things; …with an intimate group of like minded individuals. This is the open source ethos – guiding beliefs, ideals of a community It's a great time to be working with open source 1.5 Million Projects 78% of companies run on open source 64% of companies participate It's a great time to be working with open source 88% expect contributions to grow 66% consider before proprietary <3% Don't use OSS 2015 Future of Open Source Survey Black Duck, Northbridge It's a great time to be working with open source It's a great time to be working with open source It's a great time to be working with open source It's a great time to be working with open source Open-course/Open-source Marc Wathieu CC-BY-NC-SA https://www.flickr.com/photos/marcwathieu/2412755417/ _____ College first Massive Open source Online Course (MOOC) Are you seeing other examples of this Mini-MOOC trend (free, I began but did not finish my first The Gates grantees aren’t the only ones open source courses by a MOOC (Massive Open-Source, startup or organization)? Online Course). -
IE 5.5 and Netscape 4.75 - Why Upgrade? ..Page 1
In This Issue . IE 5.5 and Netscape 4.75 - Why Upgrade? ..page 1 WindowsME for Home Computing ..…..…..page 1 Critical Updates are Essential ……..……….page 1 Win 95/98 Web Browser Upgrade.…………page 2 Permanent LRC Stations…………...……….page 2 cc:Mail is Retiring ……..…………..………..page 2 The newsletter for IPFW computer users Information Technology Services October 2000 Courses & Resources…………….……….….page 2 IE 5.5 and Netscape for Home 4.75 - Why Upgrade? Computing Campus surfers should update their browsers to the Microsoft recently released its upgrade to Windows 98 latest versions of Netscape and Internet Explorer (IE). for home computing — Windows Millennium (WindowsMe). Windows users may do so by the following instructions on Follett's IPFW Bookstore is now offering the CD to students, page 2. Macintosh users may obtain the instructions for faculty, and staff as part of IU's licensing agreement with creating an alias for either or both programs from the Help Microsoft. Is the upgrade for you? Windows Millennium Desk (e-mail: [email protected]). includes: Very basic digital media editing tools Why upgrade? In general, obtaining the latest 4 IE 5.5 (also downloadable for Windows 98) version of your favorite browser helps ensure that you have 4 4 Media Player 7 (also downloadable for Windows 98) the most capable and secure browser for today's Web If you have no compelling need for the above features environment. Specifically, the newest and most significant or if you take the time to do wnload IE 5.5 and/or Media Player 7 features of each include: for Windows 98, you may want to skip this upgrade. -
Our Comments to the FCC on the NTIA Petition for Rulemaking On
Before the Federal Communications Commission Washington, DC 20554 In the Matter of ) ) National Telecommunications ) RM – 11862 and Information Administration ) ) Petition for Rulemaking to ) Clarify provisions of Section 230 ) Of the Communications Act of 1934 ) COMMENTS OF TECHFREEDOM (CORRECTED) 110 Maryland Ave NE Suite #205 Washington, DC 20002 Dated: September 2, 2020 Before the Federal Communications Commission Washington, DC 20554 In the Matter of ) ) National Telecommunications ) RM – 11862 and Information Administration ) ) Petition for Rulemaking to ) Clarify provisions of Section 230 ) Of the Communications Act of 1934 ) COMMENTS OF TECHFREEDOM: EXECUTIVE SUMMARY Section 230 is the law that made today’s Internet possible. The law has allowed websites to host content created by users without, as the bill’s author, Rep. Chris Cox (R-CA), warned in 1995, “spending vast sums of money trying to define elusive terms that are going to lead to a flood of legal challenges.” Without the broad protections of 230(c)(1) in particular, websites would face “death by ten thousand duck-bites” in the form of massive litigation risks. NTIA asks the FCC to turn this law on its head, but the FCC has no authority to reinterpret the statute. The plain language and the legislative history of Section 230 demonstrate that Congress did not intend to grant any regulatory authority to the FCC. Instead, as Rep. Cox declared, Congress did “not wish to have a Federal Computer Commission with an army of bureaucrats regulating the Internet.” Under the statute’s express terms, the “interactive computer service” providers protected by Section 230 are not “information service providers,” nor are they otherwise subject to the FCC’s jurisdiction. -
Cruising the Information Highway: Online Services and Electronic Mail for Physicians and Families John G
Technology Review Cruising the Information Highway: Online Services and Electronic Mail for Physicians and Families John G. Faughnan, MD; David J. Doukas, MD; Mark H. Ebell, MD; and Gary N. Fox, MD Minneapolis, Minnesota; Ann Arbor and Detroit, Michigan; and Toledo, Ohio Commercial online service providers, bulletin board ser indirectly through America Online or directly through vices, and the Internet make up the rapidly expanding specialized access providers. Today’s online services are “information highway.” Physicians and their families destined to evolve into a National Information Infra can use these services for professional and personal com structure that will change the way we work and play. munication, for recreation and commerce, and to obtain Key words. Computers; education; information services; reference information and computer software. Com m er communication; online systems; Internet. cial providers include America Online, CompuServe, GEnie, and MCIMail. Internet access can be obtained ( JFam Pract 1994; 39:365-371) During past year, there has been a deluge of articles information), computer-based communications, and en about the “information highway.” Although they have tertainment. Visionaries imagine this collection becoming included a great deal of exaggeration, there are some the marketplace and the workplace of the nation. In this services of real interest to physicians and their families. article we focus on the latter interpretation of the infor This paper, which is based on the personal experience mation highway. of clinicians who have played and worked with com There are practical medical and nonmedical reasons puter communications for the past several years, pre to explore the online world. America Online (AOL) is one sents the services of current interest, indicates where of the services described in detail. -
3Com Homeconnect Pc Digital Camera
© 2001. All rights reserved. Black Box Corporation. Black Box Corporation • 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Support: 724-746-5500 • www.blackbox.com • e-mail: [email protected] 3COM HOMECONNECT PC DIGITAL CAMERA Have a face-to-face conversation with your out-of- state relative or a co-worker down the hall—all without leaving your chair. Key Features ometimes an email just isn’t In addition, you can view your the images so that the picture Camera uses your PC’s Senough. For some conver- coworkers in return. See and talk looks brighter and clearer. USB port. sations, you need interact face to to several people—all in different Requirements include a PC face. But what if the person you places—simultaneously, using with at least a 166-MHz Supports 24- or 16-bit need to talk to is halfway around your phone line or the Internet. processor, 32 MB of RAM, a USB video. Uses DSP for the country? Then what? The Camera operates with port, and a CD-ROM drive. high-quality images. Before you make hotel plug-and-play installation. Simply Software on the included CD- reservations, pack your suitcase, plug it into your PC’s USB port and ROM gives you extensive video It’s easy to install and and board your flight, check out install the included software. capabilities, including video perform video editing, the 3Com HomeConnect PC Because of its slim design, the phone calls, video e-mail, enhance photos, and Digital Camera. Use it to project camera takes up minimal space multiparty video chat, and video have interactive your voice and a full-motion video on your PC. -
Ebay Response to Carl Icahn
February 24, 2014 eBay Inc. Responds to Carl Icahn's Feb. 24 Open Letter to Stockholders SAN JOSE, Calif.--(BUSINESS WIRE)-- New eBay shareholder Carl Icahn has cherry-picked old news clips and anecdotes out of context to attack the integrity of two of the most respected, accomplished and value-driven technology leaders in Silicon Valley. Marc Andreessen and Scott Cook bring extraordinary insight, expertise and leadership to eBay's board, which is scrupulous in its governance practices and fully transparent with regard to its directors' other affiliations and businesses. And eBay Inc. President and CEO John Donahoe is widely respected for his turnaround of eBay and leadership of the company over the past six years. As we are sure our other shareholders would agree, we prefer to engage in more constructive and substantive discussions of why, in our view, PayPal and eBay are better together. Instead, Mr. Icahn unfortunately has resorted to mudslinging attacks against two impeccably qualified directors. Mr. Icahn has nominated two of his employees to eBay's board. As we have said, the board's nominating committee will review the nominations of his employees in due course. Even if our board does not support the nominations, ultimately shareholders will decide whether they believe Mr. Icahn's employees are better qualified than directors such as Mr. Cook (Mr. Andreessen is not up for re-election this year) to sit on the board of a leading technology company. The board has been clear in its view that shareholders are best served by keeping PayPal part of eBay. The board regularly assesses all strategic options for the company; should circumstances change the board is entirely capable of evaluating alternatives for optimizing shareholder value.