“杨振宁先生与复旦大学物理系教师的座谈”

by 格致 on 8月 24, 2011

还记得 Worldline of Yu Shi (施郁的世界线)[1,2] 么?很早的一个科学博客。

09年的时候杨振宁访问复旦,与复旦物理系的教师进行了座谈。后来施郁把座谈内容整理好发在了《物理》杂志上[pdf, html]。我觉得这篇文章里的杨振宁,才是作为科学家的本色。我们从媒体文章中看到的杨振宁都是被变调的。

座谈中,他讲了不少东西,推荐阅读。

摘录一小节吧。在谈到灵感时,他举了几个例子,最后一个是Dirac的:

Dirac在做研究生的时候,在一九二五年,他的导师叫做Fowler,拿到了一部preprint,是Heisenberg的preprint。于是Fowler就把这个给Dirac看。根据这书上说(这故事Dirac从前也讲过,不过没有现在这个讲得清楚),Dirac看了以后,他不懂Heisenberg搞的是什么,因为你知道,Heisenberg的思路跟Dirac是完全不一样的。所以Dirac并没有太懂Heisenberg讲什么。可是有一句话他看见了,Heisenberg的文章上讲: “我现在做的东西有点奇怪, A乘B不等于B乘A。” 这一点somehow Dirac记得。为什么Dirac记得?因为Dirac从前就喜欢quaternions,而quaternions里头A乘B不等于B乘A。这一点在Dirac脑子里头触动了Dirac的神经。 然后他就把这个放下了。过了几个礼拜以后,他忽然有一天想起来,Poisson Bracket也是A乘B不等于B乘A。可是,根据这书上说,他不记得Poisson Bracket是怎么回事。那天正好是礼拜天,所以他有了这个灵感以后,他就很着急,于是就等,等到第二天图书馆开门了,他到图书馆去一看,原来就发现Poisson Bracket跟Heisenberg的algebra是完全一回事情。所以就写出来了他的这个……所以他的后来的quantum mechanics,就是从这个灵感来的。所以你看,他这里头重要的一点,就是somehow Dirac当初了解了可以有algebra是quaternion,这个在他的脑子里头种下去以后,等到后来发现Heisenberg的东西时,他把这两个对在一起。这是another example。我现在要讲的,就是说,你在念书的时候,你不只是要把一个东西念了里头,它那个somehow有的东西呢,密切地跟你脑子里头有些接触的地方,这个如果你能够把它留在那儿,保养起来,甚至于稍微发展一下的话,这个将来可能就有开花结果的可能。

原谅他中英文夹杂的说话方式。

26 comments

嘻嘻

by maishao on 2011/10/06 at 00:09. 回复 #

读读去~

by Ai on 2011/10/22 at 23:20. 回复 #

要是数学功底好,一定更能体会其中的深刻性。但是,就是看懂了个个中心思想 – -!!

by Patmos on 2011/11/01 at 13:09. 回复 #

中英夹带也不奇怪了。

by 土木坛子 on 2011/11/01 at 21:01. 回复 #

俺的英文不好,量子力学也还给老师很多年了。这里面大概讲狄拉克被海森堡的矩阵方程启发?

by 好山水 on 2011/11/10 at 19:15. 回复 #

网站是不是做过调整了?文章的RSS订阅都只能订阅到评论了,已经有一阵子这样了。希望能把这个问题改好,不然都没法RSS订阅了。

by Litilda on 2011/12/15 at 15:17. 回复 #

很好的座谈

by taiju on 2012/02/10 at 10:18. 回复 #

厉害。。

by 蔬菜岛 on 2012/05/06 at 17:43. 回复 #

很好的座谈 精彩啊

by ppin11 on 2012/05/31 at 14:12. 回复 #

好像杨振宁写过一文 关于格物致知的吧

by 胖女孩 on 2012/06/19 at 21:03. 回复 #

Привет на одном из сайтов нашел дестелятор теперь думаю вручить деду, только вот не знаю про эту фирму ничего, как вы считаете стоит взять
купить самогонный аппарат добрый жар в белорусии

by vat on 2018/11/25 at 02:26. 回复 #

Hi everyone , I’m Rima Morrison.
Welcome to my about page. I started writing in my early school years after a creative writing assignment for my English teacher. I did creative writing for a while before I thought about doing something else.
I had always loved doing research papers because I’m passionate about learning. When you combine writing ability with a love of learning, academic writing only makes sense as a job.
I’m passionate about assisting the students of the future in their school career. When they get too busy, I am there to help.

Rima – Academic Writing Help – Digitalassessments Corp

by rimamorr on 2019/03/13 at 18:06. 回复 #

Hello All
Thanks for checking out my writing website . My name is Victoria.
I have worked since high school in this niche. My passion for writing started at a young age. I wrote journaled as a child and eventually went on to work with my school newspaper.
This early tryst into reporting eventually led me to academic writing. There is plenty of work for professional writers. I specialize in dissertations , but have the skills to do all types of academic writing.
Reach out for more information about rates and a price quote. I’m looking forward to helping you.

Academic Writer – Victoria Patton – A2zcareers Band

by victoriapatton on 2019/03/18 at 18:46. 回复 #

Hi everyone , I’m Jena Berry.
Welcome to my homepage . I started writing in middle school after a creative writing assignment for my English teacher. I did creative writing for almost a year before I thought about doing something else.
I had always loved doing non-fiction writing because I’m passionate about learning. When you combine writing ability with a love of learning, dissertation writing only makes sense as a job.
I’m passionate about aiding the students of the future in their school career. When they don’t like their assignment , I am there to help.

Jen – Academic Writing Help – Biomathdynamics Company

by jenaber on 2019/04/09 at 17:43. 回复 #

Welcome to my blog ,
I’m Agata Whitley.
If you’ve ever been too tired and couldn’t finish a academic paper, then you’ve come to the right place. I assist students in all areas of the writing steps . I can also write the paper from start to finish.
My career as a scholarly writer started early in college . After learning that I was very able in the field of academic writing, I decided to take it up as a career .

Talented Academic Writer- Agata Whitley- //sharepublic.trincoll.edu/SiteDirectory/gmtestblog/Lists/Training%20Request%20Form/DispForm.aspx?ID=452]Visit this site Corps

by agatawhit on 2019/06/25 at 01:25. 回复 #

Здравствуй. Задумал семьёй поехать на экскурсию, посетить Музейно-выставочный комплекс Новый Иерусалим, Русская Палестина. Остановиться намечаю в отеле “София”. Кто-то уже проживал в данной отеле… поделитесь личными впечатлениями. У гостиницы есть собственный web-сайт – http://motel-sofia.ru/

by JoseYL on 2019/08/07 at 17:25. 回复 #

Hello everyone, it’s Colleen here!
I work as a professional an essay writer and have created this content with the intent of changing your life for the better. I started honing my writing abilities in high school. I learned that my fellow students needed writing help—and they were willing to pay for it. The money was enough to help pay my tuition for my first semester of college.
Ever since school, I have continued to work as an academic writer. I was hired by a writing service based in the United Kingdom. Since then, the dissertations that I have written have been sold around Europe and the United States.
In my line of work, I have become used to hearing, “Colleen, can you help me meet my writing assignment deadline?” I know that I can save their time.

Academic Writer – Colleen – //www.45northresearch.com/]45northresearchTeam

by mcmillan on 2019/10/21 at 16:09. 回复 #

http://home-babos.ru

by homebased on 2019/10/27 at 20:39. 回复 #

Marpo, TroubleGang – VГ­kend

Pecka !
https://cz.video-video.lv/video/Rdcb9Lq%2Fu4CeD%2FE%3D.html

by ExporbHor on 2019/11/28 at 23:53. 回复 #

$200 for 10 mins “wоrk?”: http://jhdapex.quickyad.com/146

by Invеst in сryрtоcurrenсy аnd get рassive inсome оf $ 5000 pеr weек http://fhoim.yourbizbuilder.org/ca5f on 2020/04/02 at 14:50. 回复 #

Invеst $ 2252 аnd get $ 6831 еverу mоnth: http://ghilz.samsungcsprotal.com/4adca0d93

by Вinаry oрtiоns + Bitcoin = $ 5000 per wеек: http://zlin.xtechspro.com/5e237c on 2020/04/17 at 11:03. 回复 #

Hi everyone , I’m Lowrie Aston.
Welcome to my homepage . I started writing in my early school years after a creative writing assignment for my English teacher. I did creative writing for several months before I thought about doing something else.
I had always loved doing non-fiction writing because I’m passionate about learning. When you combine writing talent with a love of learning, dissertation writing only makes sense as a job.
I’m passionate about helping the students of the future in their school career. When they don’t like their assignment , I am there to help.

Lowrie – Professional Academic Writer – My Custom Essay Confederation

by lowrie on 2020/05/12 at 16:01. 回复 #

Lgvcxvy

info@chicboutique.lt
:

by Rhqxfcb on 2020/06/08 at 23:04. 回复 #

Thanks for stopping by my page! I’m Keiren.
Even though I jokingly credit my aunt for my writing talent, I know that it is a ability I have fostered from childhood. Though my aunt is a writer, I also started out young.
I’ve always had a way with words, according to my favorite professor . I was always so excited in English when we had to do a research paper .
Now, I help current students achieve the grades that have always come easily to me. It is my way of giving back to students because I understand the troubles they must overcome to graduate.

Keiren Broadhurst – Academic Writing Professional – standrewspres.org Team

by keiren on 2020/06/17 at 17:08. 回复 #

Привет коллеги! Я подумываю о инъекциях ботокса и ищу рекомендацию, в какой клинике в Москве это лучше всего сделать. Возможно рекомендовать хорошую клинику для этого? Мне важно найти место, где предлагают качественные услуги и работают опытные специалисты. Благодарю заранее за ваши советы!

by Carlosquies on 2023/12/21 at 01:40. 回复 #

Leave your comment

Required.

Required. Not published.

If you have one.