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Editorial Board Supported by NSFC Honorary Editor General ZHOU GuangZhao (Zhou Guang Zhao) Editor General ZHU ZuoYan Institute of Hydrobiology, CAS, China Editor-in-Chief YUAN YaXiang Academy of Mathematics and Systems Science, CAS, China Associate Editors-in-Chief CHEN YongChuan Tianjin University, China GE LiMing Academy of Mathematics and Systems Science, CAS, China SHAO QiMan The Chinese University of Hong Kong, China XI NanHua Academy of Mathematics and Systems Science, CAS, China ZHANG WeiPing Nankai University, China Members BAI ZhaoJun LI JiaYu WANG YueFei University of California, Davis, USA University of Science and Technology Academy of Mathematics and Systems of China, China Science, CAS, China CAO DaoMin Academy of Mathematics and Systems LIN FangHua WU SiJue Science, CAS, China New York University, USA University of Michigan, USA CHEN XiaoJun LIU JianYa WU SiYe The Hong Kong Polytechnic University, Shandong University, China The University of Hong Kong, China China LIU KeFeng XIAO Jie University of California, Los Angeles, USA Tsinghua University, China CHEN ZhenQing Zhejiang University, China University of Washington, USA XIN ZhouPing LIU XiaoBo The Chinese University of Hong Kong, CHEN ZhiMing Peking University, China China Academy of Mathematics and Systems University of Notre Dame, USA Science, CAS, China XU Fei MA XiaoNan Capital Normal University, China CHENG ChongQing University of Denis Diderot-Paris 7, Nanjing University, China France XU Feng University of California, Riverside, USA DAI YuHong MA ZhiMing Academy of Mathematics and Systems XU JinChao Academy of Mathematics and Systems Pennsylvania State University, USA Science, CAS, China Science, CAS, China MOK NgaiMing XU XiaoPing DONG ChongYing The University of Hong Kong, China Academy of Mathematics and Systems University of California, Santa Cruz, USA PUIG Lluis Science, CAS, China CNRS, Institute of Mathematics of Jussieu, YAN Catherine H. F. DUAN HaiBao France Academy of Mathematics and Systems Texas A&M University, USA Science, CAS, China QIN HouRong YANG DaChun Nanjing University, China E WeiNan Beijing Normal University, China Princeton University, USA RINGEL Claus M. University of Bielefeld, Germany YE XiangDong Peking University, China University of Science and Technology FAN JianQing SHANG ZaiJiu of China, China Princeton University, USA Academy of Mathematics and Systems Science, CAS, China YU XingXing Georgia Institute of Technology, USA FENG Qi SHEN ZhongMin Academy of Mathematics and Systems Indiana University-Purdue University ZHANG James J. Science, CAS, China Indianapolis, USA University of Washington, USA FU JiXiang SHU Chi-Wang ZHANG JiPing Fudan University, China Brown University, USA Peking University, China GAO XiaoShan SIU Yum-Tong ZHANG Ping Academy of Mathematics and Systems Harvard University, USA Academy of Mathematics and Systems Science, CAS, China SUN LiuQuan Science, CAS, China GE GenNian Academy of Mathematics and Systems ZHANG PingWen Zhejiang University, China Science, CAS, China Peking University, China GUO XianPing SUN XiaoTao ZHANG ShouWu Sun Yat-sen University, China Academy of Mathematics and Systems Columbia University, USA Science, CAS, China HE XuMing ZHANG Xu University of Michigan, USA TAN Lei Sichuan University, China University of Angers, France HONG JiaXing ZHANG YiTang Fudan University, China TANG ZiZhou University of New Hampshire, USA Beijing Normal University, China HSU Elton P. ZHOU XiangYu Northwestern University, USA TEBOULLE Marc Academy of Mathematics and Systems Tel Aviv University, Israel JI LiZhen Science, CAS, China University of Michigan, USA WANG FengYu ZHU XiPing Beijing Normal University, China Sun Yat-sen University, China JING Bing-Yi The Hong Kong University of Science WANG HanSheng ZONG ChuanMing and Technology, China Peking University, China Peking University, China E ditorial Staff CHAI Zhao YANG ZhiHua ZHANG RuiYan [email protected] [email protected] [email protected] ISSN 1674-7283 CN 11-5837/O1 Volume 56, Number 12 December 2013 Indexed by: Sponsored by SCI-CD CHINESE ACADEMY OF SCIENCES MR NATIONAL NATURAL SCIENCE FOUNDATION OF CHINA Z Math MathSciNet math.scichina.com www.springer.com/scp SCIENCE CHINA PRESS Ownership by Science China Press; Copyright© by Science China Press, and Springer-Verlag Berlin Heidelberg 2013 Submission of a manuscript implies: that the work described has not been published before (except in the form of an abstract or as part of a published lecture, review, or thesis); that it is not under consideration for publication elsewhere; that its publication has been approved by all co-authors, if any, as well aṣtacitly or explicitlỵby the responsible authorities at the institution where the work was carried out. 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All fees should be paid to the Copyright Clearance Center, Inc., 222 Rosewood Drive, Danvers, MA 01923, USA, Tel.: +1-978-7508400, Fax: +1-978-6468600, http://www.copyright.com, stating the ISSN of the journal, the volume, and the first and last page numbers of each article copied. The copyright owner's consent does not include copying for general distribution, promotion, new works, or resale. In these cases, specific written permission must first be obtained from the publish- ers. Abstracted/indexed in Science Citation Index (SCI), Chemical Abstracts Service, Current Contents Connect, CompuMath Citation Index, Inspec, Zen- tralblatt Math (Z Math), Aquatic Sciences & Fisheries Abstracts (ASFA), Current Mathematical Publications (CMP), MathSciNet, etc. SCIENCE CHINA Mathematics Vol. 56 No. 12 December 1 2013 (Monthly) Supervised by Chinese Academy of Sciences Sponsored by Chinese Academy of Sciences and National Natural Science Foundation of China Published jointly by Science China Press and Springer Subscriptions China Science China Press, 16 Donghuangchenggen North Street, Beijing 100717, China Email: [email protected] Fax: 86-10-64016350 North and South America Springer New York, Inc., Journal Fulfillment, P.O. Box 2485, Secaucus, NJ 07096 USA Email: [email protected] Fax: 1-201-348-4505 Outside North and South America Springer Distribution Center, Customer Service Journals, Haberstr. 7, 69126 Heidelberg, Germany Email: [email protected] Fax: 49-6221-345-4229 Printed by Beijing Zhongke Printing Co., Ltd., Building 101, Songzhuang Industry Zone, Tongzhou District, Beijing 101118, China Edited by Editorial Board of SCIENCE CHINA Mathematics, 16 Donghuangchenggen North Street, Beijing 100717, China Editor-in-Chief YUAN YaXiang CN 11-5837/O1 䚂থҷো: 80-201 ܗ ᑓਞ㒣㧹䆌ৃ䆕: ҀϰᎹଚᑓᄫ㄀ 0429 ো ೑ݙ↣ᳳᅮӋ: 136 Mathematics CONTENTS Vol. 56 No. 12 December 2013 Preface ......................................................................................................................................................................................................
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