地球作業系統 1.1

(安:我原本的「思考作業系統」,和一般人的一樣,都是不能自己想出剛才的內容。但是,不知為何,好像只要加上一些 add-on(外掛程式),就可以明白到那些內容,用一個全新的角度去思考。)

我知道原因。人要生存,先要在腦海中,對這個世界建構一個 model(思想模型)。有了思想模型,人才可以做到日常的決定。為什麼你想不出剛才先進的內容呢?因為人的思想結構是,work(運行到)的東西,就自動不會主動去想。「Work」的意思,並不是指對你很有利,而是指不會危害生命安全。

「凡事思考」的話,腦部會太繁忙,不能過正常的生活,所以,沒有必要想的東西,人腦就自動不去想。但是,怎樣可以知道生活現狀中,哪些東西有必要思考,哪些東西最值得挑戰呢?

— Me@2011.01.05

2011.01.05 Wednesday (c) All rights reserved by ACHK 

Gluon

Gluons (from English glue and the suffix -on) are elementary expressions of quark interaction, and are indirectly involved with the binding of protons and neutrons together in atomic nuclei through the strong force. The antiparticle of a gluon is another gluon (see Eight gluon colors below).

In technical terms, they are vector gauge bosons that mediate strong color charge interactions of quarks in quantum chromodynamics (QCD). Unlike the electrically neutral photon of quantum electrodynamics (QED), gluons themselves carry color charge and therefore participate in the strong interaction in addition to mediating it, making QCD significantly harder to analyze than QED.

— Wikipedia on Gluon

2011.01.04 Tuesday ACHK

Original

.

* Next to the originator of a good sentence is the first quoter of it.

* A great man quotes bravely, and will not draw on his invention when his memory serves him with a word just as good.

* Genius borrows nobly. When Shakespeare is charged with debts to his authors, Landor replies: “Yet he was more original than his originals. He breathed upon dead bodies and brought them into life.”

— Ralph Waldo Emerson

.

.

.

2011.01.04 Tuesday ACHK

驗算校對 1.1

這段改篇自 2010 年 4 月 23 日的對話。

你加減乘除準不準確?

(CN:一題數式要左右對調時,就有時會錯。)

有兩種驗算策略:一種是,做完整份卷才開始驗算;另一種是,做完每題立刻驗算,驗算好才開始做下一題。我不知道,哪一種比較適合你。

(CN:我覺得應該做完整份卷才驗算,因為如果每題做完也立刻驗算的話,不會有足夠時間完成整份卷。)

「做完整份卷才驗算」的問題是,可能你整份卷根本完成不了,從而導致最後完全沒有任何驗算的機會。

(CN:但是,如果每題做完也立刻驗算的話,明明是原本有足夠時間完成的試卷,也會完成不了。)

可能真的是那樣。但是,「每題立刻驗算」會令到你凡是完成了的題目,都完全準確,即使你不能完成所有題目。

(CN:但是,後面那些你沒有時間完成的,可能正正是你擅長的題目。)

兩害取其輕。

(CN:那又是。)

每題立刻驗算的話,可能令你只能完成八成的題目,但是,那八成都是運算準確的。不每題立刻驗算的話,可能令你可以完成十成的題目,但是,那十成之中,有多少成是運算準確的,你也不敢估計。

其實,哪一個「害」比較大,要有上文下理:視乎是哪一個考生、哪一份試卷。所以,我並沒有說定,哪一個方法,比較適合你。

— Me@2011.01.04

2011.01.04 Tuesday (c) All rights reserved by ACHK

Symmetry

A symmetric explanation is qualitatively different from an asymmetric explanation. It therefore deserves a comparable prior probability.

Because a symmetric theory is more constraining, an agreement with observations adds more units of evidence in favor of its validity than it does to the competing asymmetric theory.

— Lubos Motl

2011.01.03 Monday ACHK

刪除 NG 法

演員在劇中可以說話流利的原因是,

那些 NG 鏡頭全部被刪去。 

— Me@2010.12.31

Blooper

A blooper is a short sequence of a film or video production, usually a deleted scene, containing a mistake made by a member of the cast or crew. These bloopers, or outtakes as they are also called, are often the subject of television shows or are occasionally revealed during the credit sequence at the end of comedy movies.

— Wikipedia on Blooper

2011.01.03 Monday (c) All rights reserved by ACHK 

縮減開支

上班 5.4

打工(受僱)有意思的地方是,短期來說會比較可行,因為自僱的不好處是,你可能要等一段不短的時間(例如兩年),才開始有明顯收入。但是,你總不可能等兩年才吃飯。

為了追求理想而不吃飯是行不通的,因為不吃飯的話,人會死。死了就追求不到理想。

所以,對剛完成學業的人來說,應該先打工,以維持生計。但是,如果心裡有自僱打算的話,你會一路打工,一路儲備糧草,直到足夠維持起碼一年的生活基本開支為止。

另一方面,要加快儲蓄進度的話,你要縮減開支。思考清晰的話,「縮減開支」其實幾乎沒有困難。

例如,如果我是女士的話,我不會花太多錢去買太多的化妝品。我只會買最重要的一兩件。過多的化學物質塗在臉上,反而對臉部有害,違反化妝的原意。

又例如,我現在用的電腦,是五年前買的。雖然我的電腦很舊,但是,用舊電腦和用新電腦來(例如)寫網誌,又有什麼分別呢?

— Me@2011.01.02

2011.01.03 Monday (c) All rights reserved by ACHK 

Covariant transformation

In physics, a covariant transformation is a rule (specified below), that describes how certain physical entities change under a change of coordinate system. In particular the term is used for vectors and tensors. The transformation that describes the new basis vectors in terms of the old basis, is defined as a covariant transformation. Conventionally, indices identifying the basis vectors are placed as lower indices and so are all entities that transform in the same way.

The inverse of the covariant transformation is called the contravariant transformation. In order that a vector should be invariant under a coordinate transformation, the components of a vector must transform according to the contravariant rule. Conventionally, indices identifying the components of a vector are placed as upper indices and so are all indices of entities that transform in the same way. The summation over all indices of a product with the same lower and upper indices are invariant to a transformation.

— Wikipedia on Covariant transformation

2011.01.02 Sunday ACHK

背誦製成品 6.3

原創論 4.3 | 不思考之道 2.3

這段改篇自 2010 年 4 月 23 日的對話。

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?

(CN:原來是這樣…)

所以,你在數學考試前,一定要「限時間」和「計分數」,做到三份 past papers(歷屆試題)。

(CN:我知。

其實,我有一個朋友,以前在會考的數學科拿到 A 級成績。但是,他不是一個十分聰明的人。所以,我問他用什麼讀書方法。他說他背了答案。我就覺得很奇怪:「公開試又有什麼答案可以背呢?」

他反問:「你不覺得歷年的考試題目類型,其實是差不多的嗎?根本,你做了 past papers,就自然會記得那些題目類型,從而記得那些運算技巧。結果,就會不小心地拿了 A。」

我的反應是:「o下?!這麼簡單?」)

考會考(中學五年級公開試)可以用這個方法。

— Me@2011.01.01

2011.01.01 Saturday (c) All rights reserved by ACHK  

World of Goo

by 2D Boy

World of Goo is a physics-based puzzle game by 2D Boy, an independent game developer consisting of Kyle Gabler and Ron Carmel, both former Electronic Arts employees, released for Microsoft Windows, Mac OS X, Linux, iOS and WiiWare. 

— Wikipedia on World of Goo

2011.01.01 Saturday ACHK