H****g
发帖数: 14447 | 1 中国粮食产量数据可能虚报一亿吨
如果这个说法得到了证实，就可以和“80后90后农民不愿务农 中国恐陷无人种地处境
”的新闻对上号了。
现在看来，让茅于轼出来说“中国不需要守住18亿亩耕地红线，没粮食可以靠进口“，
就是有目的的为以后大批进口美国粮食放口风而已。
“A discrepancy of about 100 million metric tons in the last three years
alone was caused by unreliable statistics, chairman Li Qiang told an
industry conference in Boao, Hainan. Shanghai JC is China’s largest
independent agricultural researcher by membership. The overstated volume
represents 18 percent of annual output, according Bloomberg News
calculations based on ... 阅读全帖 |
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h*******x
发帖数: 347 | 2 only $93 B
compare to $###B bond owned by PRC
"the 1,536 metric tons of gold, worth about $93 billion at" |
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l*****7
发帖数: 8463 | 3 http://www.wnd.com/2012/09/israeli-science-website-obama-birth-
WND EXCLUSIVE
Israeli science website: Obama birth certificate forged
Award-winning, former Netanyahu adviser behind assessment
Published: 09/10/2012 at 8:02 PM
by Jerome R. CorsiEmail | Archive
Jerome R. Corsi, a Harvard Ph.D., is a WND senior staff reporter. He has
authored many books, including No. 1 N.Y. Times best-sellers "The Obama
Nation" and "Unfit for Command." Corsi's latest book is "Where's the REAL
Birth Certificate?"Mor... 阅读全帖 |
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l*****7
发帖数: 8463 | 4 http://content.usatoday.com/communities/theoval/post/2012/08/ob
Obama has millions of fake Twitter followers
Comments 43
By David Jackson, USA TODAY
Updated 2012-08-24 11:42 AM
President Obama and Mitt Romney
CAPTIONAP photosPresident Obama's Twitter account has 18.8 million followers
-- but more than half of them really don't exist, according to reports.
A new Web tool has determined that 70% of Obama's crowd includes "fake
followers," The New York Times reports in a story about how Twitter
fol... 阅读全帖 |
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L*****s
发帖数: 6046 | 5 看看数学文献中这些词出现的频率就知道谁最NB了
riemann hypothesis；
riemann integral；
riemann zeta function；
riemann surface；
riemannian metric；
。。。。。 |
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s*****e
发帖数: 893 | 6 发展是为了什么？为了发展本身？为了数字？
也应和这个帖子
http://www.mitbbs.com/article_t/WashingtonDC/31816069.html
《产量下降了， 经济发展就是假的》
但，
如果产量保持不变，但全社会平均工作时间从每周5天缩减到3天，也是经济发展
如果产量下降10％，但全社会平均工作时间从每周5天缩减到3天，也是经济发展
如果人们吃10个红薯就饱了，非要种植收获1000个，然后烂掉处理还能创造GDP,那是作
践自己，不是发展
虽然人民大众自由时间的增加并不是ＧＤＰ数字的发展。用单纯GDP评价经济发展的观
念早被人抛弃了. 很多人早就主张用一些能反映社会宏观和长远perspective的metric
来measure progress, 比如 人口寿命 各种犯罪率 婴儿幼儿发病率，自由假期时间 vs
unvolunatry 工作时间的ratio, 人民知识教育水平, 自然环境质量 etc。 当中最反
映progress的就是 自由假期时间，自由假期时间的大大延长就给人民提供了更多的自
我提高的possibility, 不然人们的most of ... 阅读全帖 |
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t*****e
发帖数: 3544 | 7 数据不对。top rice producer 没埃及啥事啊。
Top 20 Rice Producers by Country — 2010
(million metric ton)[61]
People's Republic of China 197.2
India 120.6
Indonesia 66.4
Bangladesh 49.3
Vietnam 39.9
Burma 33.2
Thailand 31.5
Philippines 15.7
Brazil 11.3
United States 11.0
Japan 10.6
Cambodia 8.2
Pakistan 7.2
South Korea 6.1
Madagascar 4.7
Egypt 4.3
Sri Lanka 4.3
Nepal 4.0
Nigeria 3.2
Laos 3.0
澳洲是亩产最高的国家。
Australian rice farms were the most productive in 2010, with a nationwide
average of 10.8 tonnes per hectar... 阅读全帖 |
|
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z********n
发帖数: 1729 | 9 【 以下文字转载自 Headline 讨论区 】
发信人: zongheimun (feifei), 信区: Headline
标 题: Next Friday, a 130,000 ton asteroid is set to pass perilously close
to earth.
发信站: BBS 未名空间站 (Sat Feb 9 14:03:20 2013, 美东)
National Aeronautics and Space Administration experts who plotted its
trajectory are confident that the primordial rock, weighing an estimated 130
,000 metric tons, will pass within "a remarkably close distance" of Earth,
nearer than many orbiting communications satellites but far enough away to
safely sp... 阅读全帖 |
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v******r
发帖数: 1630 | 10 都签约了，30年的合约。中国正式超过德国，成为毛子最大天然气进口国。 毛子还同
意加倍石油出口，从15 million加到31 million metric tons a year. |
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p*****c
发帖数: 20445 | 11 【 以下文字转载自 Returnee 讨论区 】
发信人: pacific (hh), 信区: Returnee
标 题: Chinese applications to US graduate schools fall
发信站: BBS 未名空间站 (Wed Apr 24 14:57:53 2013, 美东)
就是不愿意承认美国的吸引力下降了。。。
Nature 496, 539 (25 April 2013) doi:10.1038/nj7446-539d
Published online 24 April 2013
Article tools
PDF
Citation
Reprints
Rights & permissions
Metrics
Applications from China to US graduate schools decline for first time in
years, says report.
Subject terms:
Careers Institutions Education
The number of applications to U... 阅读全帖 |
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g*q
发帖数: 26623 | 12 老美把美国海岸最高的Cape Hateras灯塔(57米,4830吨)都顶起来挪了窝.
目前建筑整体平移的纪录是梧州市人事局综合大楼
http://www.guinnessworldrecords.com/records-1/heaviest-building
The heaviest building moved intact is the Fu Gang Building at West Bank Road
Wuzhou, in the Guangxi Province of China. It was successfully relocated by
the Guangzhou Luban Corporation on 10 November 2004.The building weighs 15,
140.4 metric tonnes (33.3 million lb) and is 34 m (111 ft) tall. The
building was moved 35.62 metres horizontally and it took eleven days to
... 阅读全帖 |
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i*******g
发帖数: 1154 | 13 BEEF PRICES IN SOUTH KOREA NOW WORLD'S HIGHEST
One-hundred-dollar steaks and gold flaked chocolates once symbolized both
the luxury and expense of urban life in Japan, but the U.S. Meat Export
Federation (USMEF) now calculates that South Korea has supplanted Japan as
the country with the highest average beef prices in the world.
A strong currency and high import duties have coupled to create the
distinction, but the continued absence of U.S. beef, which once accounted
for half of total beef cons... 阅读全帖 |
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y**********g
发帖数: 2728 | 14 比如计算机系，数学系出来的，抽象思维都很发达，数学就不说了。计算机里面，线程
，进程，操作系统,面向对象这些抽象的东西，对于整天看显微镜刷试管的生物化学博
士来说，非
常难以理解，看不见摸不着，太鸡巴抽象了，无法理解啊！这就是差距。
至于数学里面的测度，泛函，空间，metrics这些更加抽象的概念，对于生物化学整天
从事体力劳动的奴隶来说，头脑炸掉也想不通。 |
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N******n
发帖数: 3003 | 15 the intelligence indice is not a metric of happiness and freedom. But human
being lived in a miserable life at the beginning, and they did not have much
choice and had to use some tricks to help them survive in those tough
environment. |
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c****e
发帖数: 1628 | 16 1900年由伯克利，密大，哈佛，普林斯顿，UPENN等学校发起，
接受新的申请者，后来也剔除几个
The Catholic University of America
Public (34)[edit source]
The University of Arizona (1985)
University at Buffalo, The State University of New York (1989)
University of California, Berkeley (1900)
University of California, Davis (1996)
University of California, Irvine (1996)
University of California, Los Angeles (1974)
University of California, San Diego (1982)
University of California, Santa Barbara (1995)
University of Colorado Boulder (1966)
U... 阅读全帖 |
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m********s
发帖数: 55301 | 17 学习了。
赞一个。
The gross tonnage of the Allure is 225,282 and her displacement — the
actual weight of the ship — is equal to that of Oasis, which is estimated
to be around 100,000 metric tons, slightly less than that of an American
Nimitz-class aircraft carrier. Her steel hull alone weighs roughly 54,000
tons. |
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b********n
发帖数: 38600 | 19 16 People On Things They Couldn’t Believe About America Until They Moved
Here
http://thoughtcatalog.com/michael-koh/2013/11/16-people-on-thin
1. Rakib Islam
I am originally from Bangladesh and here are a few things that I find hard
to explain to peeps back home.
•Fruits and vegetables are way more expensive than meat and poultry.
•That, generally speaking, the poor is more obese than the rich.
•A lot of couples adopt children, sometimes in spite of having their
own, and treat t... 阅读全帖 |
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k******1
发帖数: 2883 | 20 远近是相对的，现代技术条件下，地理远近都non-relevant了，地球就屁大点地方。
文化，种族，价值观的认同，才是远近的metric |
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u***r
发帖数: 4825 | 21 http://www.bloomberg.com/news/2014-01-02/gold-holds-above-1-200
Gold futures jumped the most in three weeks on speculation that demand for
bars and jewelry will increase in Asia. Platinum posted the biggest gain in
more than two months.
The premium to take immediate delivery of gold in China was $23 an ounce
today, compared with an average of $16.21 in December and $18.72 for all of
last year, data compiled by Bloomberg show. The Reserve Bank of India on Dec
. 31 eased some controls on imports. ... 阅读全帖 |
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u***r
发帖数: 4825 | 22 In the first three quarters of 2013, demand in China, the top buyer, was 797
.8 metric tons |
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n********o
发帖数: 210 | 23 你自己功课没有做好吧？
With such a sturdy hull and high power to back it up, the 13,000-ton (13,200
metric ton) Polar Star is able to break through ice up to 21 feet (6.4 m)
thick by backing and ramming, and can steam continuously through 6 feet (1.8
m) of ice at 3 knots (6 km/h).[4] |
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z******o
发帖数: 3073 | 24 网上有一篇 ：一个普通的投行分析员的一天
我看来看去感觉主要工作就是修改Ppt 开会 吃饭 那技术含量和难度不就是文秘一个级
别吗？只不过看上去工作量要多很多，折腾得大家都不得好睡，明显就是把原先三个人
的工作量压缩给一个人，美其名曰是金领。其实不就是原来要雇三个人的，现在雇你一
个，给你两个人的工资，等于老板白白赚了一个人的工钱吗？尼玛这多不划算啊 人生
最大的享受和奢侈不就是睡个饱觉吗？这些人无非就是要个脸，为别人活。
全文如下
投行分析员的一天是怎样的呢？真的只是白天玩Solitaire， 晚上才开始干活么？有的
时候我忙到要在办公桌下放一个空塑料瓶，要上厕所直接在座位上解决. 有的时候，我
闲到可以吃三个小时的午饭，然后下载不同的电脑主题打发时间. 在投资银行这一行就
像是吸毒，好的一天轻松惬意，被美女帅哥包围服侍，不好的一天，烦恼的都快要跳楼
了。 这是过去24小时我的行程表，真的发生过. 这是不好的一天!
7:30 AM –我被投行同事电话叫醒，他叫我8：00到办公室修改，发送报告。
8:00 AM – 9:00 AM –八点到办公室，拿到报告，修改报告。 8：55发送给全... 阅读全帖 |
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k*****r
发帖数: 21039 | 25 说得对，评价的metric错了，导致米国的教育根本上就是反动，腐败，低劣的。
了。 |
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g**8
发帖数: 4951 | 26 先以小学生文体开篇：今天我在网上读到了一个美国南加州尔湾的网络安全公司“群击
”(crowdstrike)公布的中国军方黑客的最新报告，读后我有一点读后感，我觉得这是
一个神一样的故事。
以下正常评论：我在那个公司的网页上读了一下他们的博客，里面给出了他们抓到这个
黑客的具体过程。
1) 首先，他们对某些被认定有恶意软件的网站域名进行了登记人情况调查，他们注意
到很多域名的注册人都使用了类似或者相同的用户名email id, 那个id就是cpyy。。。
这其中他使用的邮箱既有国内的新浪什么的也有gmail.
评论： 别的不说，大家查查这个mitbbs.com的域名注册人的邮箱是什么？我都懒得查
，肯定查不到！因为注册人屏蔽自己地址信息是一个选项，也就是除非你是big
brother，否则你是看不到的。除非，除非注册人自己没有屏蔽，而是自愿公开的，同
时，还故意用了一个和自己名字直接相关的id，此其一。神一样的故事。要么这个公司
的发现实在太神奇，要么这个黑客实在太神奇。
2）随后，根据这些email地址里用的id： now infamous cpyy， 这个公司遍访中国的
各大论坛，... 阅读全帖 |
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l******t
发帖数: 55733 | 27
尼玛诺贝尔这么好拿。来一段wiki：
Whenever energy is added to a system, the system gains mass:[citation needed]
A spring's mass increases whenever it is put into compression or tension.
Its added mass arises from the added potential energy stored within it,
which is bound in the stretched chemical (electron) bonds linking the atoms
within the spring.
Raising the temperature of an object (increasing its heat energy) increases
its mass. For example, consider the world's primary mass standard for the
kilogram, m... 阅读全帖 |
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l******t
发帖数: 55733 | 28 Quora上的。
Jeff Nelson, former ebayer, googler. Invented chromebook
Why haven't Facebook, eBay, Twitter, and Google been successful in China?
eBay:
As far as my bona fides, I was on the China integration team for eBay and in
the room in Shanghai with Meg Whitman [more shameless name dropping on my
part] when eBay did the wire-on for China.
I somewhat disagree with Kaiser Kuo that eBay was "simply beaten by a
scrappier competitor". From what I saw, we did match fees and even changed
our business m... 阅读全帖 |
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m***7
发帖数: 383 | 29 最简单最早的metric是 Levenshtein distance |
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l*******1
发帖数: 16217 | 30 麻痹，我这才发现我们香港同胞是真能吃啊，猪肉第三，牛肉第一
The world produces enough beef for for everyone to have 12.25 pounds.
Hong Kong consumes the most beef per capita in the world followed by
Argentina and Uruguay.
Hong Kong consumes more than 123 pounds of beef per capita.
The Congo consumes less than 1 pound of beef per capita.
World 57,240,000 7,158,000,000 12.25
Rank Country Consumption Population Per Capita
1 Hong Kong 582,000
7,219,700
123.51
2 Argentina 2,700,000
42,669,50... 阅读全帖 |
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o**********e
发帖数: 18403 | 31 【 以下文字转载自 JobHunting 讨论区 】
发信人: onetiemyshoe (onetiemyshoe), 信区: JobHunting
标 题: 中国传统文化之弊端 (转载)
发信站: BBS 未名空间站 (Wed Jun 24 11:39:35 2015, 美东)
发信人: xiaotuzi5 (Xiao Tu Zi), 信区: SanFrancisco
标 题: 中国传统文化之弊端
发信站: BBS 未名空间站 (Sun Jun 21 16:03:00 2015, 美东)
在美国呆了快8年了，5年读书，2年多FLG工作，最近想谈谈一个大话题：中国传统文化
之弊端。在我的感知中，中国传统文化中弊端比较大的是以下两条：
1） 在中国传统文化中根本没有人人平等的概念，相反我们的文化中，我们从小的教育
中充满了这样的话：“吃得苦中苦，方为人上人”，“不能输在起跑线上”。我们的传
统文化相反的是讲求碾压别人，一个很好的例子就是面子，什么是面子，一个人自己不
可能有面子，一定要和别人比才有面子，比的目的则是碾压对手，从苹果在中国卖得最
好是一个例子，因为很多人觉得有一个苹果... 阅读全帖 |
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b********n
发帖数: 38600 | 32 You know its really hard to believe that the Chinese, for being as
diciplined and smart as they are in so many matters, got duped into falling
for the only thing proping up the Western economies. That is, ever expanding
credit fueling whatever growth that can be had. I mean first they invested
in infrastructure projects with free flowing credit from numerous parties
only to eventually realize that these apartment complexs, roads, energy
plants, shopping centers, etc. actually needed earnings to ... 阅读全帖 |
|
b********n
发帖数: 38600 | 33 You know its really hard to believe that the Chinese, for being as
diciplined and smart as they are in so many matters, got duped into falling
for the only thing proping up the Western economies. That is, ever expanding
credit fueling whatever growth that can be had. I mean first they invested
in infrastructure projects with free flowing credit from numerous parties
only to eventually realize that these apartment complexs, roads, energy
plants, shopping centers, etc. actually needed earnings to ... 阅读全帖 |
|
b********n
发帖数: 38600 | 34 You know its really hard to believe that the Chinese, for being as
diciplined and smart as they are in so many matters, got duped into falling
for the only thing proping up the Western economies. That is, ever expanding
credit fueling whatever growth that can be had. I mean first they invested
in infrastructure projects with free flowing credit from numerous parties
only to eventually realize that these apartment complexs, roads, energy
plants, shopping centers, etc. actually needed earnings to ... 阅读全帖 |
|
b********n
发帖数: 38600 | 35 You know its really hard to believe that the Chinese, for being as
diciplined and smart as they are in so many matters, got duped into falling
for the only thing proping up the Western economies. That is, ever expanding
credit fueling whatever growth that can be had. I mean first they invested
in infrastructure projects with free flowing credit from numerous parties
only to eventually realize that these apartment complexs, roads, energy
plants, shopping centers, etc. actually needed earnings to ... 阅读全帖 |
|
a*****y
发帖数: 33185 | 36 说不改行就得饿死还是夸张了，
既然是天才在哪行都能混的生活如意，那主要还是看是不是愿意坚持做科学。
发明蓝光LED而拿诺奖的哥们是在公司混的，也没有需要改行
老爱也是靠专利员这个职位来谋生，一样可以做科学
最后说到的经费和职位，其实是纳税人的钱，由国家出面管理，这从一开始就是个官僚
体制，当然是靠metrics来决定职位和经费，其实是一个挺庸俗的体制。
不过我想，天才如果改行，那只能说是不想再做科学了，而不是因为要谋生没时间做科学
see. |
|
m*p
发帖数: 1331 | 37 胶跑的好，码写的快，jira close的多，事实证明了，这些metrics在资本主义社会，
木用。
我老这十年在东西海岸几家大公司呆过，亲身经历过好几次layoff。有一个team里勤奋
的老中好友被雷，抱着一个moving box，哭丧着脸过来我cubicle说，“我手机被停了
，我们qq联系。。。”
老中在美国大公司避免被首先layoff的几个招数：
1， 关键是要掌握一些核心的，让公司伤筋动骨的IP。老中大部分都是过来读ms，phd
的，搞这个跟喝水一样。比如，如果有patent正在pending，你跑出去加入竞争对手那
里，公司会损失很多。
2， 在layoff的时候，每个人都是麦肯锡这种management consulting firm写给cxo的
那个excel sheet上的一行。关键是不要冒头，换句话说，在你的title rank里面工资
最好不要最高，在你们team里面cost和pto不要剩下太多。免得到时候一排序，枪打出
头鸟。
大家集思广益。 |
|
I*3
发帖数: 7012 | 38 its cargo of approximately 2,300 tons (approximately 2,100 metric tons) of
ammonium nitrate detonated。。
2300顿硝酸铵合多少TNT？再加上炼油厂，储油罐。。。 |
|
o**********e
发帖数: 18403 | 39 【 以下文字转载自 JobHunting 讨论区 】
发信人: onetiemyshoe (onetiemyshoe), 信区: JobHunting
标 题: 中国传统文化之弊端 (转载)
发信站: BBS 未名空间站 (Wed Jun 24 11:39:35 2015, 美东)
发信人: xiaotuzi5 (Xiao Tu Zi), 信区: SanFrancisco
标 题: 中国传统文化之弊端
发信站: BBS 未名空间站 (Sun Jun 21 16:03:00 2015, 美东)
在美国呆了快8年了，5年读书，2年多FLG工作，最近想谈谈一个大话题：中国传统文化
之弊端。在我的感知中，中国传统文化中弊端比较大的是以下两条：
1） 在中国传统文化中根本没有人人平等的概念，相反我们的文化中，我们从小的教育
中充满了这样的话：“吃得苦中苦，方为人上人”，“不能输在起跑线上”。我们的传
统文化相反的是讲求碾压别人，一个很好的例子就是面子，什么是面子，一个人自己不
可能有面子，一定要和别人比才有面子，比的目的则是碾压对手，从苹果在中国卖得最
好是一个例子，因为很多人觉得有一个苹果... 阅读全帖 |
|
o*********e
发帖数: 3093 | 40 http://www.smh.com.au/world/china-puts-on-huge-show-of-force-at
China puts on huge show of force at parade
Beijing: In a broadcast to the world of its rising power and growing
military capability, China has paraded a procession of tanks, fighter jets
and ballistic missiles through the heart of Beijing's Tiananmen Square.
The proceedings were billed by Beijing as a commemoration for those who
fought and died in World War II, but most Western countries, including the
United States and Australia, a... 阅读全帖 |
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p****s
发帖数: 3184 | 41 呵呵，对于N qubit的quantum computer，一般computer (Turing Machine)上的NP问题
在input metric x <= N的时候 就是这台quantum computer的P问题。 |
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p****s
发帖数: 3184 | 42 你这是上离散数学课扯算法基础的蛋
还是先去上上Goldwasser, Bellare, Impagliazzo这些MIT gang出身的人的算法基础课吧
先去弄明白NP问题的input metric bit length和probabilistic Turing Machine是什
么意思 |
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n***9
发帖数: 564 | 43 所有在这里高谈metric的全是学校里的千老, 而非工业届的. |
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d**z
发帖数: 3577 | 44 Trafigura Says It's Winding Down Flagship Commodity Hedge Fund
Commodities trader Trafigura Pte Ltd. said it is closing its flagship Galena
Metals Fund, the latest hedge fund victim of the rout in raw materials
markets from oil to copper.
Commodities hedge funds are heading for their worst year since the 2008-09
global financial crisis, with some shutting down -- including the $450
million Armajaro Commodities Fund -- after losing money and clients.
"In view of the difficult conditions prevailin... 阅读全帖 |
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d**z
发帖数: 3577 | 45 Louis Dreyfus Hedge Fund Edesia Said to Close Singapore Unit
The hedge fund controlled by commodity giant Louis Dreyfus Holding BV will
close its Singapore office to focus on its European trading operations,
according to three people with knowledge of the matter.
The closure will eliminate four positions at Edesia Asset Management BV,
about 10 percent of the hedge fund’s staff, said two of the people, asking
not to be identified because the decision hasn’t been made public. Edesia
currently has ... 阅读全帖 |
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t*****a
发帖数: 5180 | 46 fuckable rate: 每天晚上勃起的JB / 全国男人数
fucked rate: 每天晚上XOXO的pussy / 全国女人数
fucking rate: 每天晚上勃起的JB / 每天晚上XOXO的pussy
先主席时代，特别是文革时期，没人管，fucking rate, fucked rate都非常高。 由于
停课闹革命，大家热衷锻炼身体，军事5项啊什么的，而不是学英语，刷题，玩手机，
fuckable rate非常高。
麻痹的改开30多年，fuckable rate低下，台湾香港这种二逼洋奴殖民地，屁精流行，
fuckable rate 也不行。整个社会失去进步的原动力。由于倒贴嫖资外F流行，fucked
rate虽然不低，都贡献给黑幕三疣的fucking rate了。
擦。 |
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r*****1
发帖数: 3465 | 47 江青同志的fucked rate是多少？
刘庆棠，浩亮，庄则栋，于会泳，孙玉国？
老毛的fucking rate肯定比王进喜，陈永贵高，张春桥，姚文元这种索南是不是只能自
摸？ |
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x****o
发帖数: 21566 | 48 Singapore, March 02, 2016 -- Moody's Investors Service has today changed the
outlook to negative from stable on China's government credit ratings, while
affirming the Aa3 long-term senior unsecured debt, issuer ratings, and (P)
Aa3 senior unsecured shelf rating.
The key drivers of the outlook revision are:
1. The ongoing and prospective weakening of fiscal metrics, as reflected in
rising government debt and in large and rising contingent liabilities on the
government balance sheet.
2. A continui... 阅读全帖 |
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c***l
发帖数: 2490 | 49
没觉得牛津大学的GTM丛书比Springer的GTM丛书B格高。PUP出的好的书都是那些鹅毛犹
太人写的。很多书都很薄，很薄。需要功底。
总之看作者不看出版社。看出版社太“那义务（江蛤语）”了。
一般鹅毛犹太人写的数学书都不错。鹅毛犹太人是美国数学学会一个很大的势力，经常
“打压中国人（星宿老仙语）”。
下面是牛津的GTM list
1. Keith Hannabuss: An Introduction to Quantum Theory
2. Reinhold Meise and Dietmar Vogt: Introduction to Functional Analysis
3. James G. Oxley: Matroid Theory
4. N. J. Hitchin, G. B. Segal, and R. S. Ward: Integrable Systems: Twistors,
Loop Groups, and Riemann Surfaces
5. Wulf Rossmann: Lie Groups: An Introduction through Linear... 阅读全帖 |
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m**********e
发帖数: 12525 | 50 关键这段:
Lorentzian流形因为时间分量是虚数,所以流形的切矢量数学上可以分为类时,类空,和
null三类:
参见causal strecture:
.... Unlike Riemannian manifolds with positive-definite metrics, a signature
of (p, 1) allows tangent vectors to be classified into timelike, null
or spacelike (see Causal structure)....
https://en.wikipedia.org/wiki/Causal_structure |
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