c**********j
发帖数: 133 | 1 不知道某些人是不是真是做数论的,如果真是的话,有这番言论就不应该了。公平地说，
自从改革开放以后，国内媒体对陈景润和哥德巴赫猜想的宣传确实是过头的，包括对华
罗庚的宣传也有过头之嫌。但那时是时势所迫，中国百废待兴，需要一些偶像来鼓舞士
气。这个暂且不论。
至于哥德巴赫猜想的地位，这么说吧，它绝对不是数论里面的核心问题，更不是什么皇
冠上的
明珠。但是，由于它已经被提出有两百多年了，难度摆在那里，就像Fermat's Last
Theorem,
象征意义多于它的实际意义。但是倘若有机会攻克这样的问题而不取，那肯定脑子有问
题吧。
你可能说Andrew Wiles 是证明了Taniyama-Shimura, 这个比FLT有意思多了。可是歌德
巴赫，又何尝不是如此呢。想想上世纪60，70年代的时候，正是筛法理论发展的黄金时
期，Atle Selberg,
Enrico Bombieri, Klaus Roth(都是Fields medalist)先后都在小筛法，大筛法方面做
出杰出
贡献，你不能否认说这个领域在当时不是主流吧。相反，这个领域当时正是热火朝天的
。当时
，Bombieri由于证... 阅读全帖 |
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r********9
发帖数: 1116 | 2 厚道啥，你看Goldston多酸
While the new sieve allowed Zhang to prove that there are infinitely many
prime pairs closer together than 70 million, it is unlikely that his methods
can be pushed as far as the twin primes conjecture, Goldston said.
Even with the strongest possible assumptions about the value of the level of
distribution, he said, the best result likely to emerge from the GPY method
would be that there are infinitely many prime pairs that differ by 16 or
less. |
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g****t
发帖数: 31659 | 3 这个没觉得酸.基本上是学术判断.
而且这里的一些说法,张说不定也能同意.
厚道啥，你看Goldston多酸
While the new sieve allowed Zhang to prove that there are infinitely many
prime pairs closer together than 70 million, it is unlikely that his methods
can be pushed as far as the twin primes conjecture, Goldston said.
Even with the strongest possible assumptions about the value of the level of
distribution, he said, the best result likely to emerge from the GPY method
would be that there are infinitely many prime pairs that differ by 16 or
l... 阅读全帖 |
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i****g
发帖数: 3896 | 4 能不能不要只盯着这些无聊的生活细节啊？他的学生对他评价都很高，绝对是一位优秀
的老师：
This man taught me calculus. A wonderful gentleman and a phenomenal
instructor.
[+]Temorse 282 points283 points284 points 12 hours ago (11 children)
[–]Temorse 282 points283 points284 points 12 hours ago
I was also lucky enough to have him as my calc professor, twice. The first
thing he would tell us at the beginning of each term was, "My name is Yitang
Zhang, but in China, you would call me Zhang Yitang." Then he would erase
both names off the white ... 阅读全帖 |
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I*****c
发帖数: 20 | 6 Tao的Polymath8快要完工了，洋洋洒洒写了170页
最近就是不停有一些小修小改，我发现有一个细节比较逗
比较早一个版本里，有若干处出现breakthrough
Zhang's argument built upon an earlier breakthrough of Goldston,...
Zhang's breakthrough paper established a non-trivial case of this conj..
In their breakthrough paper, Goldston, Pintz and Yldrm showed..
In the breakthrough paper [gpy], a variant of the Selberg sieve was..
The main technical breakthrough of Zhang's paper ...
In all the literature based on the breakthrough work of Goldston,..
不知道大家怎么看，我当时感觉好像修饰GP... 阅读全帖 |
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d*****g
发帖数: 1616 | 7 PRIMES IN INTERVALS OF BOUNDED LENGTH
ANDREW GRANVILLE
To Yitang Zhang, for showing that one can, no matter what.
After these clarifications of Zhang's work, two researchers asked themselves
whether the original "set-up" of Goldston, Pintz and Yildirim could be
modified to get better results. James Maynard obtained his Ph.D. this summer
at Oxford, writing one of the finest theses in sieve theory of recent years
. His thesis work equipped him perfectly to question whether the basic
structure of t... 阅读全帖 |
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M****o
发帖数: 4860 | 8 December 02, 2013 9:53 AM
Press release
DURHAM — Yitang “Tom” Zhang, a lecturer in mathematics at the University
of New Hampshire, will receive the 2014 Frank Nelson Cole Prize in Number
Theory from the American Mathematical Society (AMS) and the 2013 Ostrowski
Prize.
Presented every three years, the Cole Prize recognizes an outstanding
research paper in number theory that has appeared in the preceding six years
. The prize will be awarded on Thursday, Jan. 16, 2014, at the AMS's Joint
Mathemati... 阅读全帖 |
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w******n
发帖数: 1837 | 9 【 以下文字转载自 Military 讨论区 】
发信人: tgbqaz (qz), 信区: Military
标 题: 可怜的张汤姆
发信站: BBS 未名空间站 (Wed Jul 9 07:04:44 2014, 美东)
被锁男，民运，轮子吹捧成具有划时代意义，人类科学发展里程碑，光照千秋，彪炳史
册。
google了ABC,CBS,NBC,fox四大新闻网，外加cnn，纽约时报，华盛顿邮报两年报道
纽约时报科学版角落里一个消息
NBC一个小新闻，下面可怜6个评论，大概是nbc历史上评论第一少的新闻吧，第一个评
论是
This is a Prime example of nobody cares
为什么说张汤姆没什么价值呢
听我娓娓道来
一个数论有怎样的价值，取决于1.新理论新思维新方法运用，2.数学其他命题相关性，
3，实际应用转化成生产力，4.对命题猜想的解决程度
1新理论新思维新方法运用
滑铁卢大学统计与精算学教授说张汤姆使用的数学技巧不具备革新性 张汤姆使用是传
统技巧，就是的筛理论Sieve theory，从维果·布朗到陈景润，用得很烂了
2.
黎曼猜想，在今天的数学... 阅读全帖 |
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Q***5
发帖数: 994 | 10 In 1950 Selberg was awarded a Fields Medal at the International
Congress of Mathematicians at Harvard. The Fields Medal was awarded for his
work on generalisations of the sieve methods of Viggo Brun, and for his
major work on the zeros of the Riemann zeta function where he
proved that a positive proportion of its zeros satisfy the Riemann
hypothesis. |
|
I*****c
发帖数: 20 | 11 Polymath发表了一篇总结文字 http://arxiv.org/pdf/1409.8361
Maynard是这么说的:
As a graduate student who had been looking at closely related problems, it
was thrilling to hear of Zhang's initial breakthrough. I didn't participate
in the subsequent Polymath 8a project, although I found myself reading
several of the posts whilst studying Zhang's work for myself. I intended to
avoid working on anything too close to the Polymath project (to avoid any
competition), but one day I was going back through some ideas I'd... 阅读全帖 |
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d**s
发帖数: 920 | 12 Thank you for the post.
According to Maynard "although it didnt produce the equidistribution results
which lie at the heart of Zhang's work."
老张工作的核心是： equidistribution results ， which is just a modified
stronger version of （少许）加强版的bombieri-vinogradov定理.
Maynard工作的核心是多变量sieve method，
他们两个人的工作怎么能混着用， 得到更强的结果 ？
participate
to
( |
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x********i
发帖数: 905 | 13 2014: Alex Kontorovich for From Apollonius to Zaremba: Local-global
phenomena in thin orbits, Bulletin AMS, Vol. 50, 2013, pg. 187-228
2013: John C. Baez and John Huerta, for "The algebra of grand unified
theories". Bulletin Amer. Math. Soc. 47 (3): 483–552. 2010. doi:10.1090/
S0273-0979-10-01294-2.
2012: Persi Diaconis for The Markov chain Monte Carlo revolution,
Bulletin AMS, Vol. 46, 2009, pg. 179–205
2011: David Vogan for The Character Table for E8, Notices of the AMS,
Vol. 5... 阅读全帖 |
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L*m
发帖数: 235 | 14 近十年JAMS上的华人作者，JAMS上的文章相对更多，搜的没那么仔细，有可能不完全。
大家也看看有没有漏的
2015
Kähler-Einstein metrics on Fano manifolds. I: Approximation of metrics
with cone singularities
Xiuxiong Chen, Simon Donaldson and Song Sun.
Kähler-Einstein metrics on Fano manifolds. II: Limits with cone angle
less than 2π
Xiuxiong Chen, Simon Donaldson and Song Sun.
Kähler-Einstein metrics on Fano manifolds. III: Limits as cone angle
approaches 2π and completion of the main proof
Xiuxiong Chen, Simon Donaldson... 阅读全帖 |
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t*******y
发帖数: 2432 | 15 中文杂志哗众取宠而已
事实是，陈的成果很重要，要不当年H. Halberstam and H. -E. Richert也不会在
Sieve Methods付印时临时加入陈的结果
美国数学研究所在介绍2003年Goldstone和Y氁搀爁洁萀结果的简报中提到陈景润时所用
的称呼是 “伟大的中国数学家陈” (the great Chinese mathematician Chen)。
再有就是
陶在素数中存在任意长度的等差数列的论文中引用了陈景润的结果，并在之后引入陈素
数这个称法(Chen Prime) |
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a*****g
发帖数: 19398 | 16 【 以下文字转载自 Programming 讨论区 】
发信人: ananpig (●○ 围棋数学一把抓的安安猪), 信区: Programming
标 题: 19路围棋的所有合法图案终于出来了 Number of legal Go positi
发信站: BBS 未名空间站 (Fri Jan 22 10:38:03 2016, 美东)
Number of legal Go positions
The 361 points on a 19x19 Go board can be colored empty, black, or white.
Only some of the 3^361 possible positions are legal, namely those where
every group of connected stones of the same color has an empty point
adjacent to it. In the position above, black stones at E18 and N9 lack such
``liberti... 阅读全帖 |
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i*****e
发帖数: 218 | 17 向大家请教一个问题：
哥德巴赫猜想的研究传统的有三种方法：
1. schnirelmann density 密率法
2. circle method, 圆法
3. sieve method, 筛法
陈景润用了两个参数的加权筛法证明了他的著名的 1 + 2.
陈景润之后， 哥德巴赫猜想的研究有什么新的方法吗 ？主要新的进展吗 ？
我知道Helfgott关于奇数哥德巴赫猜想的研究， 也主要是改进了圆法。
那么， 陈景润之后， 这个方向有什么新的方法吗 ？
多谢大家。 |
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D******e
发帖数: 1085 | 18 Great minds think alike.
要在美国混，就早点出来，那个MASTER没啥用.
Yes, the master plus 50 cents can buy you a cup of coffee.
考BOARD有什么难的？只要国内大: 学毕业没有考不过的。之所以被传的神乎其神，无非是以后可能挣得多点，大伙很是热衷罢了。
If your memory has no more holes than a sieve, you can pass USMLEs unless you have rocks in your brain.
) 的大作中提到: 】 |
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w******t
发帖数: 107 | 19 Tanev, Peter T.; Pinnavaia, Thomas J. "A neutral templating route to
mesoporous molecular sieves." Science (Washington, D. C.) (1995), 267(
5199), 865-7. |
|
w******t
发帖数: 107 | 20 前言：刚才用高压锅煮了一大锅绿豆大米汤，发现做饭和做实验还真挺象的啊。。。
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
好，言规正传。
在前面的（一）中，俺忽悠了一下这个孔的结构。现在具体来白活白活多孔材料的尺度
分类。根据IUPAC的标准，多孔材料按照其孔径划分为三类：
（1）这个“阿一”呢，是孔径小于2个纳米的，被称为是微孔(microporous)。我们常
见的微孔材料，有大名鼎鼎的分子筛(molecular sieve, zeolite）还有活性炭。他们
的共同特征是具有超大的表面积，一般可达2000－3000 m2/g（BET法测得。有高人可能
会讲：BET测微孔材料表面积不准确！对！不过大家都这么测，所以为了统一标准和可
比较，就都这么搞）而且孔与孔之间高度联通。这就使得它们成为非常吸引人的催化剂
载体和吸附材料。（记得以前听说过什么“纳米冰箱”和“纳米防臭鞋垫”。不知道是
不是利用活性炭来吸附异味呢？哪位知道的请给科普一下）
（2）这个“阿二”呢，是孔径在2到50纳米之间的，称为中孔或介孔(mesoporous)。目
前已经商业化的介孔材料 |
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r********n
发帖数: 149 | 21 For jobs, microporous molecular sieves background is mroe preferred |
|
S*****n
发帖数: 6055 | 22 找到两个，不知道大家通常认为的是哪一个。。。
Kruk M, Jaroniec M, Sayari A
Application of large pore MCM-41 molecular sieves to improve pore size
analysis using nitrogen adsorption measurements
LANGMUIR 13 (23): 6267-6273 NOV 12 1997
Kruk M, Jaroniec M, Sayari A
Adsorption study of surface and structural properties of MCM-41 materials of
different pore sizes
JOURNAL OF PHYSICAL CHEMISTRY B 101 (4): 583-589 JAN 23 1997 |
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D******e
发帖数: 1085 | 23 You are dead wrong. The reason is simple. I have been very adamant in fighting against the bully. Please follow the timeline. The 2nd class thing was 1 yr ago. It was early this year when I was banned by the scorpion after I fought back the bully for his nasty posts on me. And for your information, I will take the credit for being the one who nailed the coffin on the bully and he is gone for good. Lexian, A++, and ChiUSMD, viky, fox, civili, r01, and many others did their parts, but the c... 阅读全帖 |
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D******e
发帖数: 1085 | 24 You are dead wrong. The reason is simple. I have been very adamant in fighting against the bully. Please follow the timeline. The 2nd class thing was 1 yr ago. It was early this year when I was banned by the scorpion after I fought back the bully for his nasty posts on me. And for your information, I will take the credit for being the one who nailed the coffin on the bully and he is gone for good. Lexian, A++, and ChiUSMD, viky, fox, civili, r01, and many others did their parts, but the c... 阅读全帖 |
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i*****s
发帖数: 15215 | 25 Do you like fishing? And do you prefer catching, cutting or cooking fish? As
a rule, these three processes are loved by different people. And you are
lucky if there are representatives of all of them among your friends or
those whom you planning to break bread with.
So, what we have are some fishes.
Let’s start cleaning it.
We are cutting the upper bone-free muscle.
The same is done with the lower bone-free muscle.
In there are other fishermen dreaming of nice fish crop down the stream, you
can ... 阅读全帖 |
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w*******y
发帖数: 60932 | 27 I was looking for a gift and came across this.
Link:
http://www.walmart.com/ip/American-Plastics-Homestyle-Kitchen-P
Excellent Reviews - priced $ 29.97 - free ship to store if not available in
your local store.
American Plastics Homestyle Kitchen Play Set:
Kitchen measures 34" x 37quot;
6 eating utensils (2 spoons, 2 knives, 2 forks)
1 cell phone
2 drinking glasses
2 plates
1 sieve
2 cooking utensils
3 casserole dishes
2 lids for casserole dishes
1 pot
1 lid for pot
1 measurement cup
Kitchen Pla... 阅读全帖 |
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w*******y
发帖数: 60932 | 28 Today I stopped by AAP to buy some automotive supplies and while walking by
the clearance racks I came across the Griot's ultra car wash bucket which
was marked down to 19.95 (normally 39.99). To our surprise while checking
out it rang-up as 9.95. While talking to the manager he stated "this is
stocked in select stores". Hopefully a few 's can get in on this deal. Good
luck!
P1030856.JPG
P1030854.JPG
Griot's Ultra bucket:
http://www.griotsgarage.com/product/ultimate car wash bucket.do?sortby=o... 阅读全帖 |
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z**********e
发帖数: 22064 | 29 http://hx.cnd.org/?p=120160
（接前文）
50年代中期，一伙精力充沛的年轻人回到金边：1956年初，英萨利结束了巴黎留学，携
妻子英提丽特和妻姐乔彭娜莉回到金边，秀蒲拉西、侯荣、宋成、胡宁、乔森潘等人也
先后回到金边。由于他们在巴黎的“马克思主义小组”隶属法共的支部，这些人的组织
关系回到柬埔寨后都自动转为柬共成员，归属杜萨木领导的城市部分。他们被称为“留
法帮”，其灵魂人物是英萨利。留法帮的政治倾向是反君主专制和在柬埔寨实现共产主
义。
留法帮与柬共“本土帮”有着不同。“本土帮”是由越共扶植的，其利益依附于越共的
利益。留法帮与越共没有渊源关系，其利益在于他们能否在柬埔寨政治领域里有所分羹
。此时，由于柬共“冬眠”，“本土帮”许多党员退出了政治，而留法帮积极活动，发
展地下组织和宣传共产主义。
英萨利很快联络上已经回国的沙洛沙。出于至今仍无法了解的原因，英萨利撮合妻姐乔
彭娜莉嫁给了沙洛沙。这一年（1956）乔彭娜莉37岁，沙洛沙31岁。从此沙洛沙和英萨
利成为连襟兄弟。乔氏姐妹作为姻亲纽带，把沙洛沙和英萨利捆系在一起。沙洛沙积极
活动，把一些年轻学生拉入柬... 阅读全帖 |
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