g*****h
发帖数: 15 | 1 College Algebra by Larson & Hostetler
DVDRip | MKV / AVC 692 Kbps | 720х544 | 29.97 fps | MP3 128 kbps | 8.75 GB
Language: English
Lecture Titles:
Prerequisites
P-1 Review of Real Numbers and Their Properties
P-2 Exponents and Radicals
P-3 Polynomials and Special Products
P-4 Factoring
P-5 Rational Expressions
P-6 Errors and the Algebra of Calculus
P-7 Graphical Representations of Data
Chapter 1 – Equations and Inequalities
1-1 Graphs of Equations
1-2 Linear Equations in in One Variable
1-3 Mode... 阅读全帖 |
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x********i
发帖数: 905 | 2 The Shaw Prize in Mathematical Sciences 2015 is awarded to Gerd Faltings,
Managing Director at Max Planck Institute for Mathematics in Bonn, Germany,
and Henryk Iwaniec, New Jersey Professor of Mathematics at Rutgers
University, USA, for their introduction and development of fundamental tools
in number theory, allowing them as well as others to resolve some
longstanding classical problems.
Number theory concerns whole numbers, prime numbers, and polynomial
equations involving them. The central p... 阅读全帖 |
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l******e
发帖数: 14 | 3 Hi,
The mass conservation still holds in this case. In the time period you
talked about, the velocity will be zero near the bottom of the hose as you
suggested. The velocity along the hose is function of both time and location
.The initial velocity (time=0)along the whole hose is zero anyway.
Your problem is actually quite challenging. It shall be able to boil down to
a one-dimensional partial differential equation.
Two variables: V=V(x,t), and P=P(x,t) for mass and momentum conservation
equatio... 阅读全帖 |
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t******n
发帖数: 6242 | 4 今天无聊，看到这篇无聊的文章，就给你无聊地翻译成英文吧。
探索星系的捷径
A Shortcut to Galaxy Exploration
1. 问苍天情为何物？
1. Ask what love is heaven?
有人类的历史以来，人类就不断地探索自然，扩展了解自然的疆界。哥伦布发现新大陆
就是最好的例子。人类探索自然的勇气是从哪儿来的呢？来自人类情感的力量。那么，
情感是什么东西呢？这是千万年来，文学家探索的主题。在有一些文学家的眼中，物理
学家是没有情感的冷血动物。我就是一个物理学家。但是，我一点也不埋怨这些文学家
。虽然物理学家在自然界的探索中做出了伟大的贡献，但是，物理学家从来就没有给出
情感的物理定义是什么，也没有找到自然界蕴含情感的丝毫证据。所以，虽然人类知道
自己的生存发展跟自然环境是密不可分的，但是，很少有人类表达出对自然环境感谢的
情感。在很多人的眼中，自然界是死亡无情的物质世界。中国有一句古语，叫做“天若
有情天亦老”。因为几乎所有人类相信天是不老的，所以，认为苍天是没有情感的，就
不足为奇了。我提出了一个宇宙生长衰老的模型。虽然这个模型及其简单，能解释大多
... 阅读全帖 |
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x********i
发帖数: 905 | 5 Section 1: Logic and Foundations
1. Zoé Chatzidakis, Université Paris Diderot-Paris 7, France
2. Ilijas Farah, York University, Canada
3. Byunghan Kim, Yonsei University, Korea
4. François Loeser, Université Pierre et Marie Curie-Paris 6, France
* Joint Speaker with Section 4. Algebraic and Complex Geometry
5. Antonio Montalbán, University of California, Berkeley, USA
6. Slawomir Solecki, University of Illinois at Urbana-Champaign, USA
Section 2: Algebra
1. Nicolás Andruskiewitsch, Univer... 阅读全帖 |
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z****c
发帖数: 2 | 6 简单来说就是用代数图像画一副图画,还得写出代数式子. 最后还得涂上颜色..~.~!
各位试试??
Worth 15 Test Points
1. On graph paper, draw something that inspires you. Be creative! Now,
redraw your picture using only straight line segments, parabolic curves, and
shapes from any of the other seven basic graphs. (You can use shapes from
other graphs too, but be careful, you’ll need to write the equations of
them!)
2. You must find and write the equations of at least 4 straight lines and 6
other curves (from the other seven basics). You... 阅读全帖 |
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L******k
发帖数: 395 | 7 Problem Description
-------------------
Your task is to write a command-line program to evaluate a set of
equations, each specified on separate lines. An equation is defined
by:
=
is the left-hand side of the equation and is always a variable
name. A variable name can only be composed of letters from the
alphabet (e.g. for which isalpha(c) is 1). is the right hand
side of the equation and can be composed of variables, unsigned
integers, and the + operator.
Here is one exa... 阅读全帖 |
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t******l
发帖数: 10908 | 8 另一方面，我觉得 “美式构建式数学教育”，在 代数/前代数/Formal-Operation 阶
段最大的问题，两个：
其一：是在 Formal Operation 阶段，没有考虑 Formal Operation 阶段的特点，照抄
小学阶段 Concrete Operation 的 spiral 教学法。这带来 (a) 教学进度太慢，教授
的基础知识太少，花太多时间在不必要的 spiral 上，(b) 在 Formal Operation 的
spiral 的循序渐进层面，也有问题。
这个原因是 Formal Operation 是有明显的阶段性和结构性的，而 spiral 的时候很难
越过阶段性和结构性的边界。举个例子就是：
Algebra 1 和 "linear" geometry / "linear" analytic geometry，比如 solve
linear equation, solve system equations, complete a square, solve quadratic
equation, equation of line, slope of ... 阅读全帖 |
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x********i
发帖数: 905 | 9 http://iccm.mcm.ac.cn/dct/page/1
Invited Lectures
Group 1
Fan Qin: Cluster algebras and monoidal categorification
Fang Li: Positivity of acyclic sign-skew-symmetric cluster algebras via
unfolding method and some related topics
Cheng-Chiang Tsai: An attempt for affine Springer theory
Li Cai: The Gross-Zagier formula: arithmetic applications
Ming-Hsuan Kang: Geometric zeta functions on reductive groups over non-
archimedean local fields
Huanchen Bao: Canonical bases arising... 阅读全帖 |
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A***u
发帖数: 3714 | 10 WASHINGTON — It’s not just the government that might be keeping tabs on
you. Many retailers are tracking you, too — or at least your merchandise
returns.
The companies say it’s all in the name of security and fighting fraud. They
want to be able to identify chronic returners or gangs of thieves trying to
make off with high-end products that are returned later for store credit.
Consumer advocates are raising transparency issues about the practice of
having companies collect information on consume... 阅读全帖 |
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A***u
发帖数: 3714 | 11 WASHINGTON — It’s not just the government that might be keeping tabs on
you. Many retailers are tracking you, too — or at least your merchandise
returns.
The companies say it’s all in the name of security and fighting fraud. They
want to be able to identify chronic returners or gangs of thieves trying to
make off with high-end products that are returned later for store credit.
Consumer advocates are raising transparency issues about the practice of
having companies collect information on consume... 阅读全帖 |
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s**u
发帖数: 9035 | 12 发信人: matrice (matrice), 信区: Physics
标 题: 拙作“杨振宁先生与复旦大学物理系教师的座谈”zz
发信站: BBS 未名空间站 (Mon Aug 22 22:23:35 2011, 美东)
http://blog.sciencenet.cn/home.php?mod=space&uid=4395&do=blog&i
拙作“杨振宁先生与复旦大学物理系教师的座谈”
已有 302 次阅读 2011-8-22 13:24 |个人分类:生活点滴|系统分类:科研笔记|关键词:
复旦大学 杨振宁 杂志发表 物理系 文章
最近在物理杂志发表的“杨振宁先生与复旦大学物理系教师的座谈”是以本人为作者的
文章。它基于杨先生与复旦大学物理系教师的对话。将它转变为一篇文章是一个创作过
程。每一个词、每一个标点都倾注了我们的心血。由于不必细说的种种方面，本文的成
文花费了我们大量的精力。本人学习研读过杨先生很多著作，与杨先生交往多年，也对
物理学史有所熟悉，但为在本文中保持和传达杨先生的风格仍然付出了大量心血。希望
本文能很好地表达杨先生的风格。
我们也很感谢物理杂志的合作。
... 阅读全帖 |
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b********y
发帖数: 3 | 13 Because you used some bad OLE objects. For example, you used lots of
equations, but some of the equations got crashed (although you can still see
them, they actually crashed, you can double click them to check).
Therefore, you should check every OLE object (like equations). Re-type those
bad equations. There is no good way to check which equation is crashed, you
need to double click it one by one. (If a equation is crashed, you cannot
enter the editing status by Equation Editor).After you delete |
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T*******n
发帖数: 493 | 14 \usepackage{amsmath}
\begin{equation}
\begin{split}
x &= x \\ &+ y \\ &+ z
\end{split}
\end{equation}
Don't use "align" in this case.
"align" is for multiple equations with common alignment,
"equation"+"split" is for breaking one single equation
into multiple lines.
You can use "split" inside "align" to break an equation
that is also aligned with other equations. |
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T*******n
发帖数: 493 | 15 split and align have very similar capabilities, but the logical mark-up
meanings: "align" two or more separate equations consistently, and
"split" one equation over two or more lines.
If you have one equation that needs to be broken into several lines and
aligned nicely, use equation+split.
If you have several equations that you want to align with respect to
each other, use align.
If you have several equations that you want to align with respect to
each other, and one of these equations also ha |
|
m*****e
发帖数: 1506 | 16 http://blog.sciencenet.cn/home.php?mod=space&uid=4395&do=blog&i
拙作“杨振宁先生与复旦大学物理系教师的座谈”
已有 302 次阅读 2011-8-22 13:24 |个人分类:生活点滴|系统分类:科研笔记|关键词:
复旦大学 杨振宁 杂志发表 物理系 文章
最近在物理杂志发表的“杨振宁先生与复旦大学物理系教师的座谈”是以本人为作者的
文章。它基于杨先生与复旦大学物理系教师的对话。将它转变为一篇文章是一个创作过
程。每一个词、每一个标点都倾注了我们的心血。由于不必细说的种种方面，本文的成
文花费了我们大量的精力。本人学习研读过杨先生很多著作，与杨先生交往多年，也对
物理学史有所熟悉，但为在本文中保持和传达杨先生的风格仍然付出了大量心血。希望
本文能很好地表达杨先生的风格。
我们也很感谢物理杂志的合作。
施郁 （复旦大学物理系教授）
2011.8.22.
附原文如下。这里是html文件的唯一源，转载请注明。
【发表为：施郁，戴越，《物理》8卷（2011年）8期，491-499，特约专稿。本文是学
术文章，使用本文时请注意引用规... 阅读全帖 |
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a**********u
发帖数: 28450 | 18 From Phys review lett website:
It’s only three lines of simple math for a human, but a small victory for a
quantum computer. Researchers in China report in Physical Review Letters
that they can solve two linear equations by manipulating four entangled
photons. Their demonstration—the rough equivalent of solving for x and y
in the equations 4x+3y=6 and 3x+2y=3 —is the first proof that a quantum
algorithm proposed in 2009, which promised exponential speed-up compared to
one run on a normal CPU,... 阅读全帖 |
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Y****N
发帖数: 8694 | 19 【 以下文字转载自 Faculty 讨论区 】
发信人: Highly (高妹), 信区: Faculty
标 题: 我为尹希教授做的专访
发信站: BBS 未名空间站 (Wed Sep 23 14:31:24 2015, 美东)
Interview with Dr. Xi Yin
--- By Fiona Rawsontile, Sept 2015
This interview was inspired by an earlier interview of Dr. Yin I saw on the
Internet, which made me think that we can’t expect someone who normally
writes for entertainment to understand a physicist. To “provoke” a
scientist, we need another scientist. So I volunt... 阅读全帖 |
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f***y
发帖数: 4447 | 20 http://www.bbc.com/earth/story/20160120-the-most-beautiful-equation-is-the-yang-baxter-equation
By Melissa Hogenboom
20 January 2016
"The Yang-Baxter equation is a simple equation that can be represented
by a picture that a two-year-old can draw," says Robert Weston of Heriot-
Watt University in Edinburgh, UK.
Like the Euler-Lagrange equation, it looks simple but has profound
implications for many areas of mathematics and physics.
These include how waves behave in shallow water, the interaction... 阅读全帖 |
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H****y
发帖数: 2992 | 21 Interview with Dr. Xi Yin
--- By Fiona Rawsontile, Sept 2015
This interview was inspired by an earlier interview of Dr. Yin I saw on the
Internet, which made me think that we can’t expect someone who normally
writes for entertainment to understand a physicist. To “provoke” a
scientist, we need another scientist. So I volunteered (to myself) and sent
an invitation to Dr. Yin, who was recently promoted to Professor in Physics
at Harvard Uni... 阅读全帖 |
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S*******t
发帖数: 3956 | 22 （作为年仅31岁就晋升哈佛正教授的青年才俊，尹希教授最近得到了很多关注。其中一
篇关于他的专访进入了一名同是美国大学华裔教授的女科学家的视线。因为觉得这样的
采访不过瘾，她突发奇想，想亲自采访一下尹希。于是就有了这个我们今天看到的两名
科学家之间的对话。这位女教授使用了化名，这是她出版自己几部科幻小说的笔名。对
，没错，这位女教授同时也是一个女文青，已经写了几本书，还都是英文，Amazon 就
能买到。感兴趣的不妨找来看看。很可能有一天，她也会成为传奇式的人物。那今天这
篇采访就会成为另一段佳话。）
Interview with Dr. Xi Yin
--- By Fiona Rawsontile, Sept 2015
Translated by Slow Rabbit
This interview was inspired by an earlier interview of Dr. Yin I saw on the
Internet, which made me think that we can’t expect some... 阅读全帖 |
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l******r
发帖数: 1642 | 23 烙印根本不认为自己是asian
他们自认是caucasian，很多白人也这样认为
https://answers.yahoo.com/question/index?qid=20090501154501AAzQNZ1
Well .... Indians are typical Australian Caucasians .... We Indians look
similar to the Australians , but with a darker ethnicity ....
Long long before ... prevailed a goegraphic plate namely ; Indo-Australian
plate ,which lied below the equator.
But on collision with the more stronger Eurasian plate caused Indian plate
to move up closer to equator and Australian plate away from equator.
S... 阅读全帖 |
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o******t
发帖数: 4384 | 24 ☆─────────────────────────────────────☆
crystalwould (Differential Equation) 于 (Sun Jun 12 23:08:52 2011, 美东) 提到:
他是好多人种的混血儿，看上去是黑人。从他爷爷奶奶那辈就都是在美国长大的。我们
在一个网站上认识的，他给我发了好多message像写文章似的，大篇幅的。我在网站上
著名我在找serious relationship,他也告诉我他也想找serious relationship，还告
诉我他想结婚。刚开始的时候，我正在准备考试，我告诉他两个礼拜之后再跟他联系（
这时还没有见面，只是在网站上聊）。他就一直等到两个礼拜之后，还告诉我他一直在
等我，考试一结束，他第二天就约我见面，我当时正在打工呢。我就说明天吧。他就又
给我发了好多message。结果第二天我们学校有毕业典礼，我都没打算参加毕业典礼，
是我朋友非让我去的。我就把见面的事给忘了。然后他还问我哪一天行，非常直接，非
常认真，我就又说了一个不久的日子。然后说要请我吃饭，问我哪家好吃，他请。我说
第一次见... 阅读全帖 |
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c**i
发帖数: 6973 | 25 (1) Amir D Aczel, An Expedition Without End; Battling subzero temperatures,
swarming mosquitoes and angry Inquisitors, all to find a single number. Wall
Street Journal, June 27, 2011
http://online.wsj.com/article/SB10001424052
702304186404576387761564776914.html
(book review on Larrie D. Ferreiro, Measure of the Earth; The Enlightenment
Expedition that Reshaped the World. Basic Books, 2011)
Quote: "But Newton's recently published theory of mechanics indicated that a
spinning Earth would look mor... 阅读全帖 |
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S*******t
发帖数: 3956 | 26 【 以下文字转载自 Faculty 讨论区 】
发信人: SlowRabit (慢吞吞的小白兔), 信区: Faculty
标 题: 翻译：高妹对尹希教授的专访
发信站: BBS 未名空间站 (Sat Sep 26 11:16:17 2015, 美东)
（作为年仅31岁就晋升哈佛正教授的青年才俊，尹希教授最近得到了很多关注。其中一
篇关于他的专访进入了一名同是美国大学华裔教授的女科学家的视线。因为觉得这样的
采访不过瘾，她突发奇想，想亲自采访一下尹希。于是就有了这个我们今天看到的两名
科学家之间的对话。这位女教授使用了化名，这是她出版自己几部科幻小说的笔名。对
，没错，这位女教授同时也是一个女文青，已经写了几本书，还都是英文，Amazon 就
能买到。感兴趣的不妨找来看看。很可能有一天，她也会成为传奇式的人物。那今天这
篇采访就会成为另一段佳话。）
Interview with Dr. Xi Yin
--- By Fiona Rawsontile, Sept 2015
Translated by Slow Rabbit
Thi... 阅读全帖 |
|
T*******n
发帖数: 493 | 27 The eqnarray environment in LaTeX has flawed spacing calculations. The LaTeX
developers decided to keep the flaw as a "feature".
The amsmath package provides more useful alignment environments. For a single
equation split over several lines that is to have only one equation number,
use a combination of the "equation" and "split" environments. For aligned
equations each with its own equation number use the "align" environment (use
\notag to suppress any equation number).
The documentation for |
|
T*******n
发帖数: 493 | 28 The eqnarray environment has bugs in the way it calculates spacing.
Use amsmath instead:
\usepackage{amsmath}
\begin{equation}
\begin{split}
x &= \text{first line} \\
&+ \text{second line, only one equation number}
\end{split}
\end{equation}
or
\begin{multline}
x = \text{this line flushed left} \\
\text{this line flushed right, one equation number}
\end{multline}
If you have many equations and some of them are long, use
split inside gather or align instead of inside equation. |
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b********e
发帖数: 58 | 29 \begin{equation}
\int_{-\infty}^{\infty} e^{-x^2}dx \int_{-\infty}^{\infty}
e^{-y^2}dy = \int_{-\infty}^{\infty} \int_{-\infty}^{\infty}
e^{-(x^2+y^2)}dxdy =\int_{0}^{2\pi}\int_{0}^{\infty} e^{-\rho^2}
\rho d\rho d\theta = 2\pi /2 = \pi
\end{equation}
Notice:
\begin{equation}
\int_{-\infty}^{\infty} e^{-x^2}dx =\int_{-\infty}^{\infty}
e^{-y^2}dy
\end{equation}
we prove the conclusion that
\begin{equation}
\int_{-\infty}^{\infty} e^{-x^2}dx = \sqrt{\pi}
\end{equation} |
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L*m
发帖数: 235 | 30 最近十年在annals of mathematics上发表或合作发表文章的华人全统计（不包括
terrence tao和一位mit本科毕业的abc华人），单位统计以现在作者单位为准
annals
2015年
A proof of Demailly’s strong openness conjecture
关启安（北京大学） 周向宇（中科院）
A solution of an L2 extension problem with an optimal estimate and
applications
关启安（北京大学） 周向宇（中科院）
Finsler metrics and Kobayashi hyperbolicity of the moduli spaces of
canonically polarized manifolds
杨世琪（普渡大学） Wing-Keung To（新加坡国立大学）
Construction of Cauchy data of vacuum Einstein field equations evolving to
black holes
黎俊彬（中山大学）... 阅读全帖 |
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s*****V
发帖数: 21731 | 31 https://www.quantamagazine.org/20160628-peter-scholze-arithmetic-geometry-
profile/
2010, a startling rumor filtered through the number theory community and
reached Jared Weinstein. Apparently, some graduate student at the University
of Bonn in Germany had written a paper that redid “Harris-Taylor” — a
288-page book dedicated to a single impenetrable proof in number theory —
in only 37 pages. The 22-year-old student, Peter Scholze, had found a way to
sidestep one of the most complicated parts of... 阅读全帖 |
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s***e
发帖数: 5242 | 32 by Freeman Dyson
12/2010
In 1946 Subrahmanyan Chandrasekhar gave a talk at the University of Chicago
entitled “The Scientist.” 1 He was then 35 years old, less than halfway
through his life and less than a third of the way through his career as a
scientist, but already he wa reflecting deeply on the meaning and purpose of
his work. His talk was one of a series of public lectures organized by
Robert Hutchins, then the chancellor of the university. The list of speakers
is impressive, and included ... 阅读全帖 |
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S****f
发帖数: 30 | 33 Maxwell Equation，实际上描述的是U(1)群的规范粒子，或者说光子，是的，它符合洛
伦兹协变性；
但是除了Maxwell Equation,还有Dirac Equation,以及各种规范理论里面的运动学方程
，它们都是符合洛伦兹协变性的。
中微子作为Fermion，服从Dirac Equation。另外，电子服从的是Dirac Equation，不
是Maxwell Equation.
所以，你可以质疑实验有没有证实中微子是否符合Dirac方程，但其实是质疑中微子是
不是基本粒子，自旋是否为1/2.我想这些应该是不用质疑的。
最后，这里的逻辑不是粒子服不服从一个方程导致相对论成不成立，而是洛伦兹协变性
是不是物理世界普遍适用的基本原理。这是狭义相对论的基本假设之一，而另一条假设
就是光速不变。 |
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z**********g
发帖数: 16 | 34 Discussing The Existence of “repulsion particle” And Its Significance
Zhuang Yiliong
Shanghai Institute of Science and Technology Management
Abstract:This report has advanced a assume about the existence of “
repellention” by a kind of new idea. Beginning with this, I have explained
more successfully some import theory questions in the area of the present
physics, cosmology and philosophy ect. At same time a few of new reasons
have been raised But this is only rough idea of physica... 阅读全帖 |
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P*****s
发帖数: 375 | 35 A nice interview I just read is being shared with you guys here. :)
[ref]
http://fionarawsontile.blogspot.com/2015/09/interview-with-dr-x
Interview with Dr. Xi Yin
By Fiona Rawsontile, Sept 2015
This interview was inspired by an earlier interview of Dr. Yin I saw on the
Internet, which made me think that we can’t expect someone who normally
writes for entertainment to understand a physicist. To “provoke” a
scientist, we need another scientist. So I volun... 阅读全帖 |
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y****d
发帖数: 432 | 36 【7】【Springer】GTM美国研究生数学书籍全集
LIST：
1 Introduction to Axiomatic Set Theory, Gaisi Takeuti, W. M. Zaring
2 Measure and Category, John C. Oxtoby
3 Topological Vector Spaces, H.H. Schaefer, M.P. Wolff
4 A Course in Homological Algebra, Peter Hilton, Urs Stammbach
5 Categories for the Working Mathematician, Saunders Mac Lane
6 Projective Planes, Hughes, Piper
7 A Course in Arithmetic, Jean-Pierre Serre
8 Axiomatic Set Theory, Gaisi Takeuti, Zaring
9 Introduction to Lie Algebras and Representation The... 阅读全帖 |
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q*******u
发帖数: 1405 | 37 【 以下文字转载自 Faculty 讨论区 】
发信人: Highly (高妹), 信区: Faculty
标 题: 我为尹希教授做的专访
发信站: BBS 未名空间站 (Wed Sep 23 14:31:24 2015, 美东)
Interview with Dr. Xi Yin
--- By Fiona Rawsontile, Sept 2015
This interview was inspired by an earlier interview of Dr. Yin I saw on the
Internet, which made me think that we can’t expect someone who normally
writes for entertainment to understand a physicist. To “provoke” a
scientist, we need another scientist. So I volunt... 阅读全帖 |
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S*********g
发帖数: 24893 | 39 【 以下文字转载自 StephenKing 俱乐部 】
发信人: StephenKing (金博士), 信区: StephenKing
标 题: 不系安全带，John Nash今天车祸死了
发信站: BBS 未名空间站 (Sun May 24 11:17:59 2015, 美东)
John Forbes Nash, Jr.
Born June 13, 1928
Bluefield, West Virginia, U.S.
Died May 23, 2015 (aged 86) [1]
Residence United States
Nationality American
Fields
Mathematics
Economics
Institutions
Massachusetts Institute of Technology
Princeton University
Alma mater
Princeton University
Carnegie Institute of Te... 阅读全帖 |
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s*****n
发帖数: 1998 | 40 Although Einstein is credited with finding the field equations,
the German mathematician David Hilbert published them in an article
before Einstein's article. This has resulted in accusations of plagiarism
against Einstein, although not from Hilbert, and assertions that the field
equations should be called the "Einstein–Hilbert field equations". However
,
Hilbert did not press his claim for priority and some[who?] have asserted
that
Einstein submitted the correct equations before Hilbert amended... 阅读全帖 |
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S*********g
发帖数: 24893 | 41 【 以下文字转载自 StephenKing 俱乐部 】
发信人: StephenKing (金博士), 信区: StephenKing
标 题: 不系安全带，John Nash今天车祸死了
发信站: BBS 未名空间站 (Sun May 24 11:17:59 2015, 美东)
John Forbes Nash, Jr.
Born June 13, 1928
Bluefield, West Virginia, U.S.
Died May 23, 2015 (aged 86) [1]
Residence United States
Nationality American
Fields
Mathematics
Economics
Institutions
Massachusetts Institute of Technology
Princeton University
Alma mater
Princeton University
Carnegie Institute of Te... 阅读全帖 |
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t*******r
发帖数: 22634 | 42 另外这题可以用通常解方程的解法跟娃讲，但不要用具体解方程的方法，
讲述思想即可。
解方程的办法，其实就是 symbol reduce，strategy 是 reduce
number of symbol in an equation。比如可以这么来：
red_circle + green_circle = 11
red_circle - green_circle = 2
reduce ... put two equation together:
但这个教两年级娃可能有困难，俺家现在三年级/开学四年级的娃，能
看懂并且 participate 解类似的 symbol math（比这个复杂些，
是个 symbol math puzzle，要寻找可能的 equation 的排列组合），
但是至少她不喜欢独立去解。。。俺也就不填鸭了。。。
我觉得在概念上，symbol reduction 比 spatial search 更难
理解/comprehend。
当然，解线性方程这种 symbol reduction，容易依葫芦画瓢。。。
上面也可能是导致许多人误认为自然语言数字也是有 place ... 阅读全帖 |
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t*******r
发帖数: 22634 | 43 为了避免歧义，俺把俺的 cynical talking 用不严格的
大名词写一下：
我前面说的那个：“解析几何 + Algebra I + 已知斜率->
求笛卡尔坐标系旋转矩阵->求相对斜率”，实际的意思是：
For the similar geometric problems can be solved exclusively
using Euclidean Geometry taught in the average middle school
classrooms, such problems should be able to solve (in a routine
way) by:
1) Using the analytic geometry that limited to algebraic
expressions. (Transcendental constants are allowed, for sure.)
2) Writing algebraic equations for the shapes. Such equations
may contains "addi... 阅读全帖 |
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t*******r
发帖数: 22634 | 44 为了避免歧义，俺把俺的 cynical talking 用不严格的
大名词写一下：
我前面说的那个：“解析几何 + Algebra I + 已知斜率->
求笛卡尔坐标系旋转矩阵->求相对斜率”，实际的意思是：
For the similar geometric problems can be solved exclusively
using Euclidean Geometry taught in the average middle school
classrooms, such problems should be able to solve (in a routine
way) by:
1) Using the analytic geometry that limited to algebraic
expressions. (Transcendental constants are allowed, for sure.)
2) Writing algebraic equations for the shapes. Such equations
may contains "addi... 阅读全帖 |
|
S*********g
发帖数: 24893 | 45 【 以下文字转载自 StephenKing 俱乐部 】
发信人: StephenKing (金博士), 信区: StephenKing
标 题: 不系安全带，John Nash今天车祸死了
发信站: BBS 未名空间站 (Sun May 24 11:17:59 2015, 美东)
John Forbes Nash, Jr.
Born June 13, 1928
Bluefield, West Virginia, U.S.
Died May 23, 2015 (aged 86) [1]
Residence United States
Nationality American
Fields
Mathematics
Economics
Institutions
Massachusetts Institute of Technology
Princeton University
Alma mater
Princeton University
Carnegie Institute of Te... 阅读全帖 |
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m*****g
发帖数: 12253 | 46 ☆─────────────────────────────────────☆
Tupac (海门的斧头) 于 (Wed Jan 25 22:25:47 2012, 美东) 提到:
圣科比的小手就不提了，比其他的我也觉得皮二哥更好，圣科比唯一能拿出来一比的柔韧性，也不好说有优势。
圣科比要是有皮二哥的身体，估计就可以正儿八经的参与“史上第一”这个讨论了
☆─────────────────────────────────────☆
OXGBIX (牛英九) 于 (Wed Jan 25 22:46:44 2012, 美东) 提到:
科比是球二代，基因优良，有品质保证
柔韧性，也不好说有优势。
☆─────────────────────────────────────☆
Tupac (海门的斧头) 于 (Thu Jan 26 02:39:54 2012, 美东) 提到:
优良的未必比变异的好使啊
☆─────────────────────────────────────☆
sckyo (And I love you so) 于 (Thu Jan ... 阅读全帖 |
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t****n
发帖数: 324 | 47 You can keep the opinion for yourself.
But please remember generally people think there is only one real equation
in 量子力学. 狄拉克's famous equation is just the equation's 相对论形式.
People know "what" of this equation and agree this is 量子力学绝对的标准,
however nobody ever able to understands "how" of this equation. |
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f**********r
发帖数: 18251 | 48 【 以下文字转载自 Military 讨论区 】
发信人: wep (买不到鸡蛋了！), 信区: Military
标 题: Re: 林宝红到底是去上海哪个学校赚卖国钱 (转载)
发信站: BBS 未名空间站 (Tue Dec 3 02:21:21 2013, 美东)
上海交大
http://www.pibb.ac.cn/pibbcn/ch/reader/view_abstract.aspx?file_
中文关键词: 普适酶反应速率方程,动力学模型,系统生物学,酶动力学
英文关键词:generic enzymatic rate equation kinetic model systems biology
enzyme kinetics
基金项目:国家重点基础研究发展计划(973)资助项目(2010CB529200, 2007CB914700)
作者 单位 E-mail
徐岷涓 上海交通大学系统生物医学研究院，系统生物医学教育部重点实验室，上
海 200240 m*******[email protected]
朱晓梅 GenMath, Corp.... 阅读全帖 |
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S*********g
发帖数: 24893 | 49 【 以下文字转载自 StephenKing 俱乐部 】
发信人: StephenKing (金博士), 信区: StephenKing
标 题: 不系安全带，John Nash今天车祸死了
发信站: BBS 未名空间站 (Sun May 24 11:17:59 2015, 美东)
John Forbes Nash, Jr.
Born June 13, 1928
Bluefield, West Virginia, U.S.
Died May 23, 2015 (aged 86) [1]
Residence United States
Nationality American
Fields
Mathematics
Economics
Institutions
Massachusetts Institute of Technology
Princeton University
Alma mater
Princeton University
Carnegie Institute of Te... 阅读全帖 |
|
l*******s
发帖数: 7316 | 50 本来是不想再回了。看你有发了那么多，我再给你科普一贴。
首先，我认为，这些东西可以讨论，但不值得为它们骂街。
因为不管Darcy's law 也好，NSE也好，既不是你也不是我发现（或发明）的。
没什么好为之骄傲的。
其次，我认为每个人的认识都是有限的。我在流体方面可能也只是半桶水。
肯定还有些在流体方面造诣极深的人在看着我们争论的笑话而不发言。
但是，从我看你发的帖子看，我可以很肯定我对流体的理解比你既深且广。
所以我认为可以给你科普一下。
（顺便说一句，有些完全没基础，又不肯学习的人，我都懒得科普）。
Darcy's law 只用于porous medium不是别人的错，因为行内人士都这样认为。
只有你把Darcy–Weisbach equation 也称为Darcy law。
当然，你有你命名的自由，只是没法跟别人交流。
我恰巧也在大学讲了十几年流体力学的课。
Darcy–Weisbach equation和Darcy's law都讲过，
我不会都把它们称为Darcy law。
我再给你讲讲为什么你所谓的Darcy law
（包括Darcy–Weisbach equation和D... 阅读全帖 |
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