金融滑浪

上班 5.3

還有,如果你是自僱的話,你一定會不斷尋找新的客源,所以,即使間中有一兩位顧客解僱你,對你的長遠生計而言,其實是沒有什麼大不了。

金融海嘯一來,有很多公司為了減輕損失,會大幅裁員。作為受僱員工,你要時刻承受「金融海嘯隨時來臨」和「自己的職位隨時被裁」的風險。作為「自由工作人」(自僱人士),在這方面的危機會小很多。「自由工作人」的生存之道,不在於所謂的「穩定工作職位」,而在於強大的「真才實學」。那些「真才實學」,並不會因為金融海嘯蓋過來,而有絲毫的損傷。

— Me@2010.12.31

2010.12.31 Friday (c) All rights reserved by ACHK 

Startup 3

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This seems an inevitable consequence of bigness. It’s true even in the smartest companies. I was talking recently to a founder who considered starting a startup right out of college, but went to work for Google instead because he thought he’d learn more there. He didn’t learn as much as he expected. Programmers learn by doing, and most of the things he wanted to do, he couldn’t—sometimes because the company wouldn’t let him, but often because the company’s code wouldn’t let him. Between the drag of legacy code, the overhead of doing development in such a large organization, and the restrictions imposed by interfaces owned by other groups, he could only try a fraction of the things he would have liked to. He said he has learned much more in his own startup, despite the fact that he has to do all the company’s errands as well as programming, because at least when he’s programming he can do whatever he wants.

— Paul Graham

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2010.12.31 Friday ACHK

烹飪比賽

背誦製成品 6.2 | 原創論 4.2 | 不思考之道 2.2

這段改篇自 2010 年 4 月 23 日的對話。

(CN:望著一條題目,你懂做就做。不懂的話,你可能回頭花五分鐘就可以想通;但是,你不會有那五分鐘。)

這個從來都是我不斷強調的信息。千萬不要期望那些 思考工具 和 運算技巧,可以由自己想出來;更加不要期望,可以由自己在考試的剎那時空內,靈機一觸想出來。

我有一個學生,他現在讀大學一年級。在今個學期,他選了一科他很喜歡的科目 — 電磁學。但是,他向我訴苦。在最近的中期試中,他的得分很低。為什麼他那麼低分呢?

我的估計是,他以為那些 物理公式 和 運算技巧,只要明白,就可以不背誦,而可以由自己在考試中途推導出來。問題是,他縱使能夠高速地推論到準確結果,起碼也要花 30 秒。而他的對手卻事先背誦了一大堆製成品,毋須任何推導,一秒就可以寫到結果出來,然後再用那些初始結果,運算更複雜的東西。

那個學生證實了我的估計。據他所講,原來他的同學在考試前,大量練習 past papers(歷屆試題),從而事先把一大堆必須的公式和技巧,安裝到腦海之中。

情形就好像參加烹飪比賽。致勝之道是,事前帶備充足的食物材料。你要煮菜的話,就應該準備好一棵菜,而不是堅持,要在烹飪比賽的時段中,把那棵菜由自己親手種出來。當你用「參加種菜比賽」的心態去參加「烹飪比賽」時,又怎會勝利呢?

— Me@2010.12.30

2010.12.20 Thursday (c) All rights reserved by ACHK  

Gibbs canonical ensemble

Under certain conditions, the Gibbs canonical ensemble maximizes the von Neumann entropy of the state subject to the energy conservation requirement.

— Wikipedia on Quantum statistical mechanics

2010.12.30 Thursday ACHK

A combination lock

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* Ambition is the death of thought.

* Philosophy is like trying to open a safe with a combination lock: each little adjustment of the dials seems to achieve nothing, only when everything is in place does the door open.

* Philosophical problems can be compared to locks on safes, which can be opened by dialing a certain word or number, so that no force can open the door until just this word has been hit upon, and once it is hit upon any child can open it.

— Ludwig Wittgenstein

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2010.12.30 Thursday ACHK

上班 5.2

You have the illusion of security. 
And that is far more dangerous than no security at all.

— Jeff Atwood —

另外,有一位網誌作家指出,一般人以為「打工」(受僱)是相對穩定的賺錢方法,是一個大錯覺,因為僱主只要一聲令下,就可以解僱你。而你就在千分之一秒之間,斷絕了所有收入來源,如果你的所有收入來源,就只有那份工作的話。

相反,如果你是自僱的話,那種情形就很難會發生。假設,現在你有九位顧客。除非他們同時解僱你,否則,你不可能在短時間內,失去全部收入來源。

還有,如果你是自僱的話,你一定會不斷尋找新的客源,所以,即使間中有一兩位顧客解僱你,對你的長遠生計而言,其實是沒有什麼大不了。

— Me@2010.12.29

2010.12.29 Wednesday (c) All rights reserved by ACHK 

背誦製成品 6.1

原創論 4.1 | 不思考之道 2.1

這段改篇自 2010 年 4 月 23 日的對話。

你可不可以在考試前,做到三份 past papers(歷屆試題)?

(CN:做到。)

要「限時間」和「計分數」才有效。你要在試前的訓練中,有計劃地闖禍,即是要窮盡考試時,所有可能犯的錯誤。那你在真正考試時,就可以「免疫」。

(CN:我知。)

你剛剛考完的物理科,在考試中途,是不是所有考試技巧的應用都無問題?例如 心理控制、時間管理、唔識就飛 等。

(CN:無問題。但是我發現了一樣新的東西。其實,考試時的倉促程度,根本不會有時間給你思考。)

無錯。從來都是。那些答案,從來應該是背出來的。

(CN:望著一條題目,你懂做就做。不懂的話,你可能回頭花五分鐘就可以想通;但是,你不會有那五分鐘。)

這個從來都是我不斷強調的信息。千萬不要期望那些 思考工具 和 運算技巧,可以由自己想出來;更加不要期望,可以由自己在考試的剎那時空內,靈機一觸想出來。

— Me@2010.12.28

2010.12.28 Tuesday (c) All rights reserved by ACHK  

Harmonic oscillator and black hole

When Andy was a student, his advisor Roman Jackiw would insist that Andy and others had to convert everything to a harmonic oscillator. And you know, field theory showed that this thing can be done to all elementary particles (and also to the Hydrogen atom and other things!). Andy is now what Roman used to be, and he insists that the students transform everything to a black hole. 🙂

— Lubos Motl

2010.12.28 Tuesday ACHK

超世 2

一方面,你要學習 如何與人相處;

另一方面,更重要的是,你要學習 如何與人不相處 和 如何不與人相處。

— Me@2010.10.22

2010.12.27 Monday (c) All rights reserved by ACHK 

Simple 3

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Although complex solutions are often admired, it is the simple solutions that get rewarded.

People admire complex solutions but reward simple ones.

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— Me@2010.12.27

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2010.12.27 Monday ACHK

上班 5.1

5. Way too risky.

Many employees believe getting a job is the safest and most secure way to support themselves.

Morons.

Social conditioning is amazing. It’s so good it can even make people believe the exact opposite of the truth.

Does putting yourself in a position where someone else can turn off all your income just by saying two words (“You’re fired”) sound like a safe and secure situation to you? Does having only one income stream honestly sound more secure than having 10?

The idea that a job is the most secure way to generate income is just silly. You can’t have security if you don’t have control, and employees have the least control of anyone. If you’re an employee, then your real job title should be professional gambler.

— 10 Reasons You Should Never Get a Job

— July 21st, 2006 by Steve Pavlina  

Mr Steve Pavlina has released the copyrights of a lot of his essays, including this one.

— Me@2010.12.27

2010.12.27 Monday (c) All rights reserved by ACHK 

Operating system 2

To kind of explain what Linux is, you have to explain what an operating system is. And the thing about an operating system is that you’re never ever supposed to see it. Because nobody really uses an operating system; people use programs on their computer. And the only mission in life of an operating system is to help those programs run. So an operating system never does anything on its own; it’s only waiting for the programs to ask for certain resources, or ask for a certain file on the disk, or ask to connect to the outside world. And then the operating system steps in and tries to make it easy for people to write programs.

    * Interview in Revolution OS, documentary, 2001.

— Linus Torvalds

2010.12.27 Monday ACHK

去蕪存菁

Managers exist to get furniture out of the way so the real talent can do brilliant work.

— Joel on Software

When you have eliminated the impossible, whatever remains, however improbable, must be the truth.

— Sherlock Holmes

But negative lessons are just as valuable as positive ones. Perhaps even more valuable: it’s hard to repeat a brilliant performance, but it’s straightforward to avoid errors.

— Paul Graham

I’m slowly becoming a convert to the principle that you can’t motivate people to do things, you can only demotivate them. The primary job of the manager is not to empower but to remove obstacles.

— Dilbert

For Michelangelo, the job of the sculptor was to free the forms that were already inside the stone.

He believed that every stone had a sculpture within it, and that the work of sculpting was simply a matter of chipping away all that was not a part of the statue.

— Wikipedia on Michelangelo

Imprisoned in every fat man a thin man is wildly signaling to be let out.

— Cyril Connolly

去蕪自然存菁

— Me@2010.10.25

2010.12.26 Sunday (c) All rights reserved by ACHK 

Men Are from Mars, Women Are from Venus

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John Gray appeared on Season 2, Episode 3 of Penn & Teller’s Bullshit!, during which Penn quipped “I guess the title ‘We’re all people and should be treated with love and respect’ just wouldn’t fit on the book spine”.

In Futurama, “It is true what they say: Women are from Omicron Persei 7, men are from Omicron Persei 9.” In one episode Amy is also seen reading a book titled “Martians are from Mars, Venusians are from Venus.”

— Wikipedia

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2010.12.26 Sunday ACHK