E*********e
发帖数: 10297 | 1 http://shine.yahoo.com/healthy-living/common-core-parent-facebo
A Facebook update from a parent frustrated with the Common Core math program
at his son’s school has made the Internet rounds after the boy struggled
to solve a simple math problem under the CC guidelines.
The parent’s note shows the elaborate Common Core (CC) formula for solving
a math program (as opposed to the simple strategy of subtracting the smaller
number from the larger one) and includes instructions from the teacher: “
Jack... 阅读全帖 |
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t*******r
发帖数: 22634 | 2 另外从肉算到电算，引入了一个新的基本层面的问题，就是对 computability
的思考。
肉算时代，只有数学家精神病吃饱了没事干才思考 computability 的问题。
对于正常人而言，computability 就是肉算到吐血前，还能算多久的问题。
电算时代就不一样了，都喝了五杯咖啡了，电脑还没出结果，你丫到底是关机
走人去幼儿园接娃，还是继续喝咖啡？。。。这个问题太简单粗暴了。。。
最最简单的例子，为啥要区分有力数和无力数（有理数vs无理数）？你小学
体育老师没告诉你无力数就是让你数到没有力气的破玩意儿么？
复杂一点的例子，为啥现代数学的四大蜘蛛是 axiom set theory,
proof theory, model theory, recursion (computability)
theory？其实下面这个 link 里这段说的还是不错的。
http://agile-development.blogspot.com/2013/03/the-four-pillars-
The theory of computation is the missing link bec... 阅读全帖 |
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a*****g
发帖数: 19398 | 3 （注意——大概有２５０条）
By John K. Jonak
Reflection is a significant part of growth. At Westmont Junior High School,
in Westmont, Illinois, my 8th grade Literacy classes took the PARCC test
this past March. My amazing two 8th grade Literacy teachers understood
there was an interesting lesson within the ongoing discussions about PARCC
testing in both school and political forums. Ms. Nancy Bartosz and Ms.
Colleen Walsh recognized that their students, being stakeholders involved in
this testing process, h... 阅读全帖 |
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t*******r
发帖数: 22634 | 4 当然做题环境没法 improve，因为 preteen 的娃，不想觉得 isolated。
另一方面，我们的做题环境也不是太差。distraction 的更重要因子是，
普通人不会太喜欢 solve math problem，说白了连我都不能搞很久。
而我觉得，很多情况下大伙儿误认为 solve math problem 不需要很多
brain inhibitory attention mechanism 的原因，很可能是因为混淆
了 repetitive math-training vs "real" math-problem solving。
而 repetitive math-training 的确不需要很多 brain inhibitory
attention mechanism。
或者用大众喜闻乐见的比方，我觉得就好比古人云：“小和尚念经，
有口无心”。这 “有口无心” 其实就是 repetitive math-training，
我都可以 “有口无心”地 烧一整天的香都没有问题。但 “有口有心”，
或者说 real math-problem solving，对普通娃而言，可... 阅读全帖 |
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t******l
发帖数: 10908 | 5 俺的意思是说，jigsaw puzzle 虽然有其 spatial perception 和 problem solving
还有 imagination 集三者与一身的优点，但也有其变化较少，以及限制于 (peusdo)
二维空间的缺点。
而作为农民，升级为 地主v1.0 以后，不能老想着每天能吃十八碗白米饭，因为十八碗
白米饭还是白米饭不是？
当然，技术而言，在 jigsaw puzzle 之后，似乎没有集 problem solving 和 spatial
perception 为一身的玩具了。
problem solving 可以考虑一招鲜的 chess，可以 solve endgame puzzle like a
machine，也可以 play game with AI like a magician。这玩具应该可以撑到小学二
年级。
三维 spatial perception 可以考虑 building block / lego (三岁四岁可能考虑大号
一点的)，以及各种三维空间 building tool.
Imagination 好像没啥 routine 的玩意儿。老... 阅读全帖 |
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t******l
发帖数: 10908 | 6 我在头疼我家大娃的内驱问题。。。虽然很多人认为内驱的第一因子是性格，
但我不这么认为，我认为内驱的第一因子可能是在于能不能相对自由容易地
处理 mental objects。。。或者说，可能跟 mental representation
有一定关系。。。
http://en.wikipedia.org/wiki/Mental_representation
具体而言，比如欧氏几何，我觉得内驱不够可能是不太能自由的看到和处理
“直角” 和 “平行线”（就好比一个人跑步但腿迈不开）。。。这最终可能归
结到第四公理和第五公理。。。
但这可能不限于第四第五公理（这两个 mental object）。。。有时候小
时候的成绩不能完全说明问题，因为 late bloomer 的存在。
一个例子是我家小娃的酱油 chess 看起来并不比大娃学得更快或者更好
（因为不是老邱教的？），但是似乎小娃（在相同的年龄，在同样有指导
的学习环境下），小娃 mentally solve "mate in 2 puzzle" 似乎更
mentally easy / free 一点，虽然不见得能 solve 得更快更好... 阅读全帖 |
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s********n
发帖数: 26222 | 7 【 以下文字转载自 Military 讨论区 】
发信人: smokinggun (硝烟), 信区: Military
标 题: Bernstein原著和方舟子剽窃文的对应分析ZT
发信站: BBS 未名空间站 (Thu Aug 25 02:01:14 2011, 美东)
China\'s Science Cop Plagiarized His Professor
While a PH.D. Student at MSU
Fang Shimin (aka Fang Zhouzi) is a well known figure in the world of
academia. Science magazine and Nature journals have several times reported
his fraud busting, whistleblowing activities in China. Science magazine
alone has given him the titles of “China’s science misconduct watchdog... 阅读全帖 |
|
|
t*******t
发帖数: 301 | 9 It is my notes from a VC talk.
1. What problem does this product solve?
2. How does this solve this problem? Need to solve 100% of the problem, not
just 90% of it.
3. Who are the end users of this product
4. Who is your revenue-supplying customer? How to satify the ender users
and the payers.
5. Does this product solve a problem that end-user/revenue supplying
customerr really have?
6. Are you sure it is a product and not just a "feature"?
7. Doess this product fit into the way that people wor |
|
v****e
发帖数: 19471 | 10 http://online.wsj.com/article/SB1000142405311190389590457654270
A top Goldman Sachs Group Inc. strategist has provided the firm's hedge-fund
clients with a particularly gloomy economic outlook and suggestions for how
these traders can take advantage of the financial crisis in Europe.
In a 54-page report sent to hundreds of Goldman's institutional clients
dated Aug. 16, Alan Brazil—a Goldman strategist who sits on the firm's
trading desk—argued that as much as $1 trillion in capital may be needed... 阅读全帖 |
|
|
o********7
发帖数: 617 | 12 转贴，这个美女写的很好。 也客观。读读
抗议ABC还可以有一个思路. 已经用这套逻辑说服组里的一个老印和一个老美签白宫请
愿了 发贴心情 Post By：10/24/2013 4:37:00 PM
这期节目对华人感情的伤害，对中国人赤裸裸的歧视， 对racial hatred有的推波助澜
作用。但是这期节目的恶性影响不仅仅涉及华人。本身 killing，let someone live这
样的表述，体现的就是对生命本身的漠视和对他人的冷 血,不管这个他人来自什么国家
。现在美国校园枪击案那么多，Sandy Hook的死难者还 尸骨未寒，作父母作老师都成
了高危职业，因为孩子们越来越多的在用暴力解决问题。 也许你公司里的老美，老印
和其它国家的移民都不在乎华裔在美国的未来，但是他们不 会有人赞成校园枪击，赞
成暴力宣传，不会有人完全不关心自家孩子是否成长在一个安 全的社会环境下。所以
可以紧紧抓住JK节目Promote violence, show no respect for life, suggest that
there is nothing wrong with solving... 阅读全帖 |
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r******s
发帖数: 925 | 13 ☆─────────────────────────────────────☆
ruokey (ruok) 于 (Thu Mar 17 23:51:39 2011, 美东) 提到:
EB1a
I-140 non-PP: FD-06/30/2010, RD-07/01/2010, AD-02/15/2011, no RFEs.
I-485s: automatically interfiled to the I-485s filed with the I-140 in NIW
in the summer of 2007; AD - 03/10/2011 (an RFE for my medical examination
report - easily solved)
My background:
Ph.D. from a top 25 US university, currently postdoc-ing in a good
engineering school.
Journal papers - 30 (including 5 in Chinese, 20 first au... 阅读全帖 |
|
b****n
发帖数: 8 | 14 Address:
Email:
Cell phone:
Work phone:
Oct 28, 2013
Department of Homeland Security
USCIS Nebraska Service Center
P.O. Box 87103
Lincoln, NE 68501-7103
I-140 Immigration Visa Petition Under First Preference EB-1
Petitioner/Beneficiary: XX Z., Ph.D.
Category of Petition: Alien of Extraordinary Ability
Classification Sought: 203(b)(1)(A)
Nature of Submission: Original Submission
Dear Immigration Officer,
This letter is respectfully submitted in s... 阅读全帖 |
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b****n
发帖数: 8 | 15 Address:
Email:
Cell phone:
Work phone:
Oct 28, 2013
Department of Homeland Security
USCIS Nebraska Service Center
P.O. Box 87103
Lincoln, NE 68501-7103
I-140 Immigration Visa Petition Under First Preference EB-1
Petitioner/Beneficiary: XX Z., Ph.D.
Category of Petition: Alien of Extraordinary Ability
Classification Sought: 203(b)(1)(A)
Nature of Submission: Original Submission
Dear Immigration Officer,
This letter is respectfully submitted in s... 阅读全帖 |
|
N****g
发帖数: 2829 | 16 https://www.popvox.com/bills/us/112/hr3012/report#nation
Opposing Comments
Today at 11:31am bradphi in Arizona's 3rd District
I oppose H.R. 3012: Fairness for High-Skilled Immigrants Act because...While
it is not a perfect solution, the per-country limit ensures that no one
country monopolizes the employment based immigration system. If this cap is
removed, two countries (India and China) will monopolize the employment
based immigration system to the detriment of over 180 other countries. This
7... 阅读全帖 |
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s*******w
发帖数: 2257 | 17 A letter to our daughter
MARK ZUCKERBERG·TUESDAY, DECEMBER 1, 2015
Dear Max,
Your mother and I don't yet have the words to describe the hope you give us
for the future. Your new life is full of promise, and we hope you will be
happy and healthy so you can explore it fully. You've already given us a
reason to reflect on the world we hope you live in.
Like all parents, we want you to grow up in a world better than ours today.
While headlines often focus on what's wrong, in many ways the world is
g... 阅读全帖 |
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d**n
发帖数: 3172 | 18 老印其实在英国和新加坡也发展得很好 我举东亚的例子是想说东亚人的管理水平是不
弱的
但在美国不行 是有很深的文化的原因的 亨廷顿所谓文明的冲突 印度俄国这些都被认
为是亚层次的
主要的只有东亚 西方和伊斯兰 这些文化本身是有很多冲突的
即使在美国的第二代也留下深深烙印 下面是一本书上摘下的
写Lynbrook的毕业生面临东西文化的冲击
作者
Hazel Rose Markus, Ph.D., is the Davis-Brack Professor in the Behavioral
Sciences at Stanford University.
Alana Conner, Ph.D., is a Stanford-trained cultural psychologist and science
communicator based in San Francisco.
Excerpt.
Chapter 1
Hearts and Minds, East and West
"Heejung?”
Hazel cold-called the graduate student at the ... 阅读全帖 |
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c**l
发帖数: 9003 | 19 很难理解吗？
kill Chinese to solve debt problem ->
kill Japanese to solve debt problem ->
kill Blacks to solve drug problem ->
kill Jewish to solve Wall street problem |
|
j****n
发帖数: 4358 | 20 【 以下文字转载自 JobHunting 讨论区 】
发信人: duduhaha (starwithme), 信区: JobHunting
标 题: 写了封信给google抱怨电面被印度人黑的经历
发信站: BBS 未名空间站 (Tue Feb 24 00:50:53 2015, 美东)
题目 class flatten {
public flatten(vector> a);
boolean hasNext();
iterator next();
}
我不到20分钟写完了，25分钟跑完test cases还问面试官有bug没，他说没有。。过了
几天收到拒信。大家觉得这个是啥难度的题目? 20分钟写完不够快？
信大家看看写得有啥问题不？
I would say the the recruiters and the first interviewer were pretty good.
But I don't understand why I get rejection from the second interviewer. This
was ac... 阅读全帖 |
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t********o
发帖数: 96 | 21 I have an excellent career opportunity for Senior Research Scientist in
Houston with a very prestigious company. If the following job description
fits and you are interested, please send you resume as a word document.
You
never have to worry about confidentiality; we will not submit your resume
without your permission. After all, you are interviewing the company as
much as they are interviewing you. I look forward to sharing this most
exciting opportunity with you!
Thank you for your time an... 阅读全帖 |
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a*****g
发帖数: 19398 | 22 (转载)Why It's Hard to Create A Strong Go Software
For a long time it was a widely held opinion that computer Go posed a
problem fundamentally different to computer chess insofar as it was believed
that methods relying on fast global search compared to human experts
combined to relatively little domain knowledge would not be effective for Go
. Therefore, a large part of the computer Go development effort was during
these times focused on ways of representing human-like expert knowledge and
combini... 阅读全帖 |
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D*******l
发帖数: 5462 | 23 4 Steps to Problem Solving
Adapted from "Science World," November 5, 1993.
A FOUR-STEP PROCESS
Billstein, Libeskind and Lott have adopted these problem solving steps in
their book "A Problem Solving Approach to Mathematics for Elementary School
Teachers (The Benjamin/Cummings Publishing Co.). They are based on the
problem-solving steps first outlined by George Polya in 1945.
1. UNDERSTANDING THE PROBLEM
* Can you state the problem in your own words?
* What are you trying to find or do?... 阅读全帖 |
|
t******n
发帖数: 2939 | 24 ☆─────────────────────────────────────☆
firekimmel (Fire Kimmel) 于 (Mon Oct 28 00:37:26 2013, 美东) 提到:
ABC不用理会普通观众，但无法将联邦政府调查员拒之门外。现在的电视节目大多是有
剧本的，Federal Communications Commission (FCC)有必要调查 Kill Everyone In
China 这句台词的用意。大多数人认为这句话有严重的种族歧视 (racial
discrimination) 及煽动性。
FCC在接到观众投诉后会进行调查，比如 2004年的 Janet Jackson Wardrobe
Malfunction 导致了50万件投诉。如果调查结果认为违规，FCC会处以罚款。
请到以下网站投诉：
http://www.fcc.gov/complaints
-->Broadcast (TV and Radio), Cable, and Satellite
-->Unauthorized, unfair, biased, illegal b... 阅读全帖 |
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lp
发帖数: 22 | 25
I don't think so. There are some problems which can't be solved by
the science, and I, among others, call them "philosophical problems".
For me, they can't be really solved: they simply change their "faces"
if someone thinks s/he solves them in one way. Sometime, they are not
problems for us "anymore". This is not because we have solved them, but
because we neglect them. Unfortunately, we can't always do this. |
|
lp
发帖数: 22 | 26
My point might be different from yours. Although I think that there
are many problems which can't be solved by science, or by other means if
we use the word "solve" in the sense that E=MC2 solves the problem of
using nuclear power, yet I feel that philosophy or religion have their
own way to handle these problems. These problems can't be in the above
sense solved by philosophy or religion, but as I mentioned before,
they can be handled more beautifully and reasonably. |
|
d*******e
发帖数: 558 | 27 很多人相信人死之后，其意识并不会立即消失，而是以灵魂的形式飘荡一段时间，并且
有可能再次转生为人。这个说法没有任何直接的科学证据：灵魂活动似乎根本没办法用
仪器测量，而且现代科学认为人的一切意识都是大脑的硬件实现的，根本不允许脱离肉
体的意识。而在我看来更重要的一点，则是现有的科学理论已经能够很不错地解释整个
世界，似乎并没有哪些事情非得用人有灵魂来解释不可。
或者，除了某些“小事情”之外。我们经常在网上论坛看到一些灵异事件的“经历
贴”，其中描述的灵异事件似乎只能用真有鬼来解释。在以宣传无神论为己任的科普人
士看来，这些经历就算再离奇，背后也一定有一个科学的，甚至是简单到可笑的解释。
但这样的态度显然没有让所有人信服。比如最近刘衍文老先生在上海书评连载《寄庐志
疑》，其中提到很多灵异事件，就对“科普们”对这些事件的可能解释表示了不屑一顾。
其实之所以长期以来都是“科普们”而不是科学家关注灵异事件，一个重要原因可
能不是科学家傲慢，而是这些事件实在很难认真对待。科学研究的第一步是证据。而鬼
，如果真有的话，他们的出现具有很强的随意性，几乎没法搞实验。网上的经历贴事实
是否成立都不好验证... 阅读全帖 |
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c****i
发帖数: 2635 | 28 感觉幸福就是有人照顾自己。。。 爱情就是被照顾后会想着折腾人家。。。
//blushing~```
今天阴差阳错地被一个印度MM拉到佛庙里去了。。。 听着梵音想着菩萨普度众生的宽
宏和金刚怒目的霹雳~``
忽然觉得派克博士的那些拿来搞团队还可以，要是感情生活也这么折腾，直接出家接受
供奉就成了，不需要沐浴人间烟火了~~` :">
ref: 附上一段，供童鞋们修行。。。
-----------------wiki--------------------
Theories
[edit] Discipline
In The Road Less Traveled,[6] Peck talked of the importance of discipline.
He described four aspects of discipline:
* Delaying gratification: Sacrificing present comfort for future gains.
* Acceptance of responsibility: Accepting respons... 阅读全帖 |
|
b***y
发帖数: 2799 | 29 ☆─────────────────────────────────────☆
qingye (qingye) 于 (Fri Jan 2 11:38:54 2009) 提到:
发信人: qingye (qingye), 信区: Mathematics
标 题: 问个MatLab小问题
发信站: BBS 未名空间站 (Fri Jan 2 11:24:50 2009)
>> r=solve('x^2 = 16', x)
??? Undefined function or method
'solve' for input arguments of type
'char'.
比如，我要solve x^2=16, command 要如何输入？谢谢。
☆─────────────────────────────────────☆
EUV (祥林嫂) 于 (Fri Jan 2 11:40:30 2009) 提到:
help solve
☆─────────────────────────────────────☆
qingye (qingye) 于 (Fri J |
|
w****w
发帖数: 521 | 30 跟儿子一起学Python,发现它表达力很强，很适合算24点这样的程序。网上搜了一下，
没发现一个像样的逻辑清晰，简洁，充分利用Python语言特点的24点程序。我习惯了过
程式，想学点函数式编程的实际运用，希望这里碰到高手。
要求：
写一个函数solve(lst,target,all)
lst是自然数列表，可以超过4。
target是24，也可以是其他数。
运算是加减乘除，如能加指数对数等则更好。
如果all是True,打出所有解答，否则打一个就够了。
程序行数最好不要超过50行，不然直接从C#/java翻过来没意思。
测试：
solve([2,3,4,5],24,True)
solve([2,5,7,11,13],19,True)
solve([1,2,3,4,5,6,7,8,9,10,11,12],37,False) |
|
w****w
发帖数: 521 | 31 跟儿子一起学Python,发现它表达力很强，很适合算24点这样的程序。网上搜了一下，
没发现一个像样的逻辑清晰，简洁，充分利用Python语言特点的24点程序。我习惯了过
程式，想学点函数式编程的实际运用，希望这里碰到高手。
要求：
写一个函数solve(lst,target,all)
lst是自然数列表，可以超过4。
target是24，也可以是其他数。
运算是加减乘除，如能加指数对数等则更好。
如果all是True,打出所有解答，否则打一个就够了。
程序行数最好不要超过50行，不然直接从C#/java翻过来没意思。
测试：
solve([2,3,4,5],24,True)
solve([2,5,7,11,13],19,True)
solve([1,2,3,4,5,6,7,8,9,10,11,12],37,False) |
|
E*****m
发帖数: 25615 | 32 我也來湊個熱鬧， Prolog, 11 行。
del([H|T],H,T).
del([H|T1],X,[H|T]):- del(T1,X,T).
evaluate(X,'-',Y,Z):- Z is X-Y.
evaluate(X,'+',Y,Z):- Z is X+Y.
evaluate(X,'*',Y,Z):- Z is X*Y.
evaluate(X,'/',Y,Z):- Y =\= 0, Z is X/Y.
solve1([X],X, []).
solve1([HH|L],X, [Operator,H1|Sol1]):- del(L,H1,L1), evaluate(HH,Operator,H1
,H), solve1([H|L1],X,Sol1).
solve0(L,X,Ans):- del(L,H,T), solve1([H|T],X,Sol),concat_atom([H|Sol],Ans).
solve(List,Target,true):- findall(Sol,solve0(List,Target,Sol), Sols), print(
Sols),!.
sol... 阅读全帖 |
|
g****t
发帖数: 31659 | 33 后来他自己删了的。
I hate almost all software. It's unnecessary and complicated at almost every
layer. At best I can congratulate someone for quickly and simply solving a
problem on top of the shit that they are given. The only software that I
like is one that I can easily understand and solves my problems. The amount
of complexity I'm willing to tolerate is proportional to the size of the
problem being solved.
In the past year I think I have finally come to understand the ideals of
Unix: file descriptor... 阅读全帖 |
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o*****l
发帖数: 734 | 34 耶鲁教授马丁 施瓦茨（刚从弗吉尼亚大学搬到耶鲁）的论文：愚蠢在科研中的重要性
论点：施瓦茨教授的一个朋友从研究生退学去了哈佛法学院。原因是科研每天都让他觉
得自己很愚蠢，需要做些别的事情。
（我是十分同意这个观点。科研，尤其是生命科学这个活是非一般心里素质的人可以干
的，因为每天都会和失败打交道。长时间的失败磨灭了你的信心，意志和前进的勇气。
很多人选择了退出，很多剩下的人留下来并非心里过硬，而是生活所迫，所谓的科研对
于很多人来说不是理想，而是谋生的手段。）
施瓦茨教授也是这样感觉的，只不过是吐啊吐啊，吐习惯成自然就好了
如何解决这个问题呢？（我也不知道，看看施瓦茨教授的观点吧，虽然觉得他有点站着
说话不腰疼的感觉）
原文： http://jcs.biologists.org/content/121/11/1771.full
The importance of stupidity in scientific research
Martin A. Schwartz
+Author Affiliations
Department of Microbiology, UVA Health S... 阅读全帖 |
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o*****l
发帖数: 734 | 35 耶鲁教授马丁 施瓦茨（刚从弗吉尼亚大学搬到耶鲁）的论文：愚蠢在科研中的重要性
论点：施瓦茨教授的一个朋友从研究生退学去了哈佛法学院。原因是科研每天都让他觉
得自己很愚蠢，需要做些别的事情。
（我是十分同意这个观点。科研，尤其是生命科学这个活是非一般心里素质的人可以干
的，因为每天都会和失败打交道。长时间的失败磨灭了你的信心，意志和前进的勇气。
很多人选择了退出，很多剩下的人留下来并非心里过硬，而是生活所迫，所谓的科研对
于很多人来说不是理想，而是谋生的手段。）
施瓦茨教授也是这样感觉的，只不过是吐啊吐啊，吐习惯成自然就好了
如何解决这个问题呢？（我也不知道，看看施瓦茨教授的观点吧，虽然觉得他有点站着
说话不腰疼的感觉）
原文： http://jcs.biologists.org/content/121/11/1771.full
The importance of stupidity in scientific research
Martin A. Schwartz
+Author Affiliations
Department of Microbiology, UVA Health S... 阅读全帖 |
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l**********1
发帖数: 5204 | 36 俄天才数学家拒领百万大奖
来源:xxx 时间:2010-03-25
爱思英语编者按：俄罗斯天才数学家佩雷尔曼3月22日表示，他不接受美国克雷数学研究所颁发的百万美元奖金。该奖
金本用来奖励他破解数学界7大难题之一的庞加莱猜想。这位数学隐士(recluse)目前失业在家，全家靠着母亲每月30英
镑的退休金相依为命。
一位因拒领百万美元大奖而声名远播的的数学天才，目前和母亲住在圣彼得堡的一个简陋公寓里，两人靠母亲每月30英
镑的退休金相依为命，这是因为他多年以来一直失业。
A maths genius who won fame this week for apparently spurning a million-dollar prize is living with his
mother in a humble flat in St Petersburg, co-existing on her ￡30-a-month pension, because he has been
unemployed for many years.
《英国周日电讯报》曾有幸追踪到这位特立独行的隐士。他... 阅读全帖 |
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s*********n
发帖数: 8 | 37 NOTE: To submit an application please go to www.hp.com, navigate to the "
Jobs" link in the lower right side of the page and follow instructions to
submit your application for job #931219. Alternatively use the link http://www8.hp.com/us/en/jobsathp/index.html to get to the "Jobs" page directly.
Job description
The incumbent will assist the HP engineers to develop a volume of fluid (VOF
) and adaptive mesh refinement (AMR) based three-dimensional multiphase flow
solver. The Cartesian grid is u... 阅读全帖 |
|
a*****g
发帖数: 19398 | 38 美国儿童的数学教育——How are our children doing in Math?
http://www.philly.com/philly/education/How_are_our_children_doi
摘要：
英语影响了孩子的最基本数学能力
“Our education system is not designed to create and shape a math brain.”
建议：
Teaching a math hierarchy from non-symbolic to symbolic to patterns and
relationships and ultimately to conceptual understandings.
正文：
Of 57 industrialized nations that participated in a 2011 Trends in
International Math and Science Study (TIMSS), United States fourth graders
ranked 11th pla... 阅读全帖 |
|
w********h
发帖数: 12367 | 39 来自主题: Macromolecules版 - Job 2 Senior Analytical Chemist at Dow
Description
The Dow Chemical Company has an exciting and challenging opportunity for an
experienced PhD level scientist to fill the role of Senior Analytical
Chemist with Dow's Analytical Sciences group located in Spring House,
Pennsylvania. Rapid product/process research, development and manufacturing
require physical and chemical measurements that remove hesitation and
guesswork. Immediate problem solving is critical, including physical
characterization and ide... 阅读全帖 |
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z*****a
发帖数: 17 | 40 1-exp[-((1-x)/y)^z]=0.05
y(1-1/z)^(1/z)+x=2
1-exp[-((3-x)/y)^z]=0.95
Solve for x, y, z.
I tried with Maple, but got "Float(undefined)" response. I wonder if my system
is wrong or Maple can not solve it? I just use "Solve()" function in Maple.
Anyother good method to solve it? I don't know Matlab or anyother math program
.
Please help me!! It's urgent!!
Thanks a lot!! |
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c**********j
发帖数: 133 | 41 Birds propose questions and frogs solve them. I do not see any meaningful
way to compare them. Taniyama et al proposed a conjecture, which Wiles et al
solved. Who is greater? Langlands has a great vision on modern number theoy
and proposed a series of fascinating conjectures, but yet has to wait for
some really smart guys to solve them, e.g., Drinfeld, Lafforgue, Ngo, etc.
Again, who is greater? In some sense, you has to admit that people propose
great conjectures do not get Fields medal but tho... 阅读全帖 |
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a*****g
发帖数: 19398 | 42 美国儿童的数学教育——How are our children doing in Math?
http://www.philly.com/philly/education/How_are_our_children_doi
摘要：
英语影响了孩子的最基本数学能力
“Our education system is not designed to create and shape a math brain.”
建议：
Teaching a math hierarchy from non-symbolic to symbolic to patterns and
relationships and ultimately to conceptual understandings.
正文：
Of 57 industrialized nations that participated in a 2011 Trends in
International Math and Science Study (TIMSS), United States fourth graders
ranked 11th pla... 阅读全帖 |
|
n*******l
发帖数: 2911 | 43 我觉得，当你用微扰法的时候，已经假定了这个解以及它的导数们只有O（1）项以及
一些O(eps^n)项。所以，当A=1/eps的时候，尽管通解是f=c1 e^{-A x}+c2，
但是e^{-A x}在x=0附近导致f的导数非常大，不再是O（1）+ \sum_{i>0} O(eps^i)，
所以微扰法的基本前提就已经排除了e^{-A x}形态的解。然后毫无疑问的你只能得到
一个f=c2形态的解。 这跟常识一致，因为e^{-A x}在x增大时很快就递减到零。
当然，我认为对微分方程来说，首先应该有一个边界条件，没有边界条件的限制，意义
有限。
If you want to know the behavior of f around x=0, you can rescale
x, say letting x=eps*y, then g(y):=f(x)=f(eps y) and the
original equation becomes g''(y) = -g'(y), involving no eps at all,
and it can be solved.
If you pretend... 阅读全帖 |
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i****g
发帖数: 3896 | 44 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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s*********n
发帖数: 8 | 45 NOTE: To submit an application please go to www.hp.com, navigate to the "
Jobs" link in the lower right side of the page and follow instructions to
submit your application for job #931219. Alternatively use the link
http://www8.hp.com/us/en/jobsathp/index.html to get to the "Jobs" page directly.
Job description
The incumbent will assist the HP engineers to develop a volume of fluid (VOF
) and adaptive mesh refinement (AMR) based three-dimensional multiphase flow
solver. The Cartesian grid is u... 阅读全帖 |
|
i**w
发帖数: 71 | 46 这些是最近两个月每次面试完，给C同学(谢谢陪我一路哈~~)的汇报整理出来的。其实
也没怎么整
理...
大部分都是常见的题。有些常见的题就直接没列。还有些当时忘了的，现在更记不起来
了。
有些是电话上的，有些是onsite。题目有些没说清楚，大家将就，领会精神。
本来什么都没定下来的时候一肚子感想和经验，想着有一天搞定了，一定好好总结总结
。现在定下来
了，倒没了兴致了。。。但想想从版上看过那么多面试题和面经，我争取写点儿，励志
型的，给出身
不好的同学们一点鼓励。也顺便攒攒人品，希望OPT快点儿下来!
1. Singly linked list, write a function to print the nodes backwards.
2. solve dS = (a - b*S)dt+sigma*dW Calculate the variance of S(T)
3. what does it look like if we plot: floating variable against the
actual value assigned to the variable?
4.... 阅读全帖 |
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