Author Archives: rpflee

防止愚善系統 3

Posted on by

一個「企圖做好人」的人，可能因為人格有嚴重的缺失，大大傷害了人也不知道。

例如，假設有異性向你示愛，但你卻對她，沒有愛情的感覺。明顯的恰當做法是，用最大方得體的語言，立刻斬釘截鐵地，拒絕她，除非她有自毀的傾向。

為什麼如果對方，沒有自毀傾向的話，你就應該立刻拒絕她呢？

如果你在愛情上，不喜歡她的話，你總有一天會拒絕她。如果你不立刻拒絕，到下次才說清楚的話，她只會加倍傷心。兩害取其輕，「現在傷心」總好過「未來加倍傷心」。

這一點我覺得很明顯，但是有些「企圖好人」，卻因為怕傷害對方，而拖泥帶水，在應該拒絕時不拒絕，到頭來令對方，加倍傷心。

防止自己愚善的第一個方法是，在應該「說不」時要立刻「說不」。

在意圖上，我們要盡力避免傷害人。同時，在知識上，我們要知道，在小部分情況下，無可避免會傷害到人。在迫不得已的情況下，在行動上，我們應該「眾害取其輕」，選擇一個對人，傷害最小的做法。

如果你在沒有可能的情況下，企圖令傷害降至零的話，你是愚善，因為結果你會，加重別人的傷心。

— Me@2011.06.21

.

.

2011.06.21 Tuesday (c) All rights reserved by ACHK

Batteries included

Posted on by

The Haskell Platform is a collection of software-packages, tools and libraries, which is to create a common platform for using and developing applications in Haskell. With the Haskell Platform, Haskell follows the same principle as Python: “Batteries included”.

— Wikipedia on Haskell Platform

The quality of a programming language itself is only one component in the ability of application writers to get the job done. Programming languages can succeed or fail based on the breadth and quality of their library collection.

— Haskell: Batteries Included

— Duncan Coutts, Isaac Potoczny-Jones and Don Stewart

2011.06.20 Monday ACHK

鑽石棉花 1.1

Posted on by

這段改編自 2010 年 5 月 9 日的對話。

Resistance（電阻）正比於物件的長度，反比於橫切面面積：

化成等式的話，我們需要一個「比例常數」，：

在物理上，這個「比例常數」，叫做 「resistivity」（電阻率）。

倒轉寫的話，resistivity 可以透過 運算得到，如果你知道 resistance 的數值的話。

Resistivity 可愛過 resistance，因為 resistivity 可以真正講出某樣物質的特性，而 resistance 則不可以。那是什麼意思呢？你可以這樣去理解：例如，我問你，

鑽石值錢一點，還是棉花值錢一點？

— Me@2011.06.19

2011.06.19 Sunday (c) All rights reserved by ACHK

Theory of Invariants

Posted on by

… relativity isn’t theory of relativity at all, it’s a theory of invariants (already Einstein made this observation, but it was too late, the current name had caught on). Some (and actually many) things in relativity are absolute.

– Marek

2011.06.19 Sunday ACHK

Loop Quantum Gravity 3

Posted on by

Choice in General Relativity: Metric, . Directly determines

Riemannian geometry; Geometrodynamics.

In all other interactions, by contrast, the basic variable is a Connection, i.e., a matrix valued vector potential .

Gauge theories: Connection-dynamics

Connections: Vehicles for parallel transport.

Classical singularities are gates to Physics Beyond Einstein.

— Introduction to Loop Quantum Gravity

— Abhay Ashtekar

2011.06.17 Friday ACHK

Bugs

Posted on by

Only useful programs can have “bugs”.

If a program doesn’t work at all, we won’t be able to see its “bugs”.

— Me@2010.01.22

2011.06.17 Friday (c) All rights reserved by ACHK

Make the world interesting

Posted on by

When a friend of mine used to grumble because he had to write a paper for school, his mother would tell him: find a way to make it interesting. That’s what you need to do: find a question that makes the world interesting. People who do great things look at the same world everyone else does, but notice some odd detail that’s compellingly mysterious.

And not only in intellectual matters. Henry Ford’s great question was, why do cars have to be a luxury item? What would happen if you treated them as a commodity? Franz Beckenbauer’s was, in effect, why does everyone have to stay in his position? Why can’t defenders score goals too?

— Paul Graham

2011.06.16 Thursday ACHK

超時空接觸

Posted on by

The Machine 3

.

David Drumlin: I know you must think this is all very unfair. Maybe that’s an understatement. What you don’t know is I agree. I wish the world was a place where fair was the bottom line, where the kind of idealism you showed at the hearing was rewarded, not taken advantage of. Unfortunately, we don’t live in that world.

Ellie Arroway: Funny, I’ve always believed that the world is what we make of it.

– Contact (1997 film)

.

.

.

2010.01.11 Monday ACHK

防止愚善系統

Posted on by

即使一個人企圖做好人，他也未必是好人。他可能因為人格有嚴重的缺失，導致他時常好心做壞事。而那個「人格缺失」，通常是「愚蠢」。

「好心做壞事」的殺傷力，往往同「壞心做壞事」不相伯仲。

而更麻煩的地方是，你勸諫一個「好心做壞事」的人不要再做壞事時，他會因為愚蠢，而不明白你在說什麼。他心目中以為，出於善意的，就一定是善行。

那是大錯特錯的。

— Me@2011.06.15

Many disasters in the world are due to dumb people trying to save the world.

—

2011.06.15 Wednesday (c) All rights reserved by ACHK

人海淘金術

Posted on by

對於大部分人來說，你越對他們好，他們就會對你越差。只有小部分人，你對他們好的話，他們會反過來對你好。

（安：我同意你的講法。但是，如果你為了防範別人忘恩負義，而對其他人不好的話，那就會損失了一些潛在的好朋友。）

我沒有講過我會對人不好。

面對一個原本不相識的人，我第一步會對他好。然後，我會視乎他的回應，來決定下一步應該怎樣。如果對方都對我好的話，我會對他更好。如果對方對我不好的話，我不會再對他好。但是，我亦不會對他不好，因為，我會直情不再跟他相處。

人生苦短，不應花任何一秒在壞人身上。

— Me@2011.06.13

2011.06.13 Monday (c) All rights reserved by ACHK

Idea babies

Posted on by

Ideas, he explained, were like babies — everything about their environment said they shouldn’t exist.

But they do. You can’t dwell on problems too early, or they will swamp the virtues and you will decide not to do the project.

— In The Plex: How Google Thinks, Works, and Shapes Our Lives, p.342

2011.06.13 Monday ACHK

二百萬

Posted on by

機械人 2

.

戀愛，只可以令到兩個人快樂。

沒有戀愛，卻有時間為一百萬人帶來快樂。

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

如果我的戀愛對象，有共同理想的話，我們就可以為，二百萬人帶來快樂。

— Me@2010.06.13

.

.

2011.06.11 Saturday (c) All rights reserved by ACHK

人狗之辨 2

Posted on by

我以前是對任何人都好的。我以前覺得，如果我對一個人好，即使他未必會對我好，至少他不會加害於我。但是，後來我發現，這個想法是錯的。

對於一部分人來說，你對他們好，他們的第一個意識就是，你可以被欺負。

馬克吐溫（Mark Twain）說過，人和狗的最大分別是，如果你對一隻狗好，給牠溫飽，牠很少會咬你。

這類現象可以用「機會成本」來解釋。

你對一個好人好的話，他會覺得是難能可貴，他會珍惜眼前人。因為不想失去你這個好朋友，他會千方百計對你好。

你對一個壞人好的話，他會覺得，既然任何情況下你都會對我好，即是欺負你也不會有任何代價，那我為什麼要對你好呢？

大部分情況下，以上的兩種思想，不會有意識地進行，而會由「潛意識」直接化成「外在表現」。

— Me@2011.06.11

2011.06.11 Saturday (c) All rights reserved by ACHK

Octonions 2

Posted on by

After all, G2 is the automorphism group of the octonions, and it has a 7-dimensional irreducible representation on the imaginary octonions; as explained in “week104” by Robert Helling, the octonions are secretly what let you write down the superstring Lagrangian in 10d spacetime.

— John Baez

2011.06.10 Friday ACHK