網誌時代 3

(安:為什麼有些人要把網誌文章結集成書呢?)

感覺不同。即使是閱讀同一篇文章,「看電腦螢幕」和「看書」的感覺不同。

以前,我曾經用三種不同的方法來閱讀同一篇文章。第一個是直接透過電腦螢幕閱讀。第二個是把文章打印出來,閱讀紙張。第三個是把文章下載至我的掌上電腦來閱讀。三種媒介,給我不同的感覺。雖然客觀上,是同一篇文章,但是主觀地,我每次看到(留意到)的,是文章中的不同文字。

— Me@2010.06.23

2010.06.24 Thursday (c) All rights reserved by ACHK

個人大組織 1.1

So how do you pick good programmers if you’re not a programmer? I don’t think there’s an answer. I was about to say you’d have to find a good programmer to help you hire people. But if you can’t recognize good programmers, how would you even do that?

— Paul Graham

— Me@2010.06.21

2010.06.23 Wednesday (c) All rights reserved by ACHK

鄭大世

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鄭大世(1984 年 3 月 2 日-),出生於日本的朝鮮民主主義人民共和國大韓民國特殊雙重國籍的足球運動員,現效力於日本 J 聯賽的川崎前鋒隊,是一名前鋒。

— 維基百科

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2010.06.23 Wednesday ACHK

自動時間表

Timetable for high school study 10.3.2

這段改篇自 2010 年 2 月 7 日的對話。

Monday Tuesday Wednesday Thursday Friday
3 hours Physics Applied Maths Pure Maths Physics Applied Maths
1 hour Chinese English Chinese English Chinese
1 hour
3 hours Pure Maths Physics Applied Maths Pure Maths Physics

「不斷循環」的好處是,你不會長時間丟低任何一科。長時間丟低一科的話,當你要重新溫習該科時,你會很不舒服,因為很多細節都已經忘記了。溫習任何一科,也應好像「馬拉松」一樣,有些時候應該發力,有些時候不應發力,而改為緩步跑。但是,任何情況下,你也不應該停下來。停了之後再嘗試跑的話,你會格外辛苦。

「不斷循環」的另一個好處是,各科不斷自動循環,你就不用花額外的時間來編排時間表。沒有這個「自動時間表」的話,你每天也要花時間考慮下一天要溫哪些科目,平均會浪費半小時。

— Me@2010.06.22

2010.06.23 Wednesday (c) All rights reserved by ACHK

Action 2

Like all nice physical theories, we can in principle derive everything about our theory of superstrings once we know the formula for the action. For bosonic strings, the action is very simple. As time passes, a string traces out a 2-dimensional surface in spacetime called the “string worldsheet”. The action is just the area of this worldsheet.

— John Baez

2010.06.22 Tuesday ACHK

係咁咖啦 2

就是這樣的 2

(安:「係咁咖啦症候群」患者,有時不單不當地預設了「現存的東西/制度是『理所當然』的」,而且把他們所身處的規則,套用在不相干的事情上。例如,有些人會講:「足球隊領隊的薪金,不及那些明星足球員高。所以,領隊很難可以駕御到那些明星足球員。」我覺得這個想法完全不相干。

本質上,一個「管理者」的薪金,不一定要高於「被管理者」的薪金。有時,情況甚至可以倒轉,例如:有一大班球員,每一個都球技超卓。但是,加在一起作為一隊時,協調不好,導致不能致勝。所以,他們合資聘請一位教練。

重點是,不一定是要「『管理者』聘請『被管理者』」。有時,可以是「『下屬』聘請『上司』」。)

— Me@2010.06.21

2010.06.22 Tuesday (c) All rights reserved by ACHK

Clarke’s three laws 4

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* Clarke’s Law of Revolutionary Ideas: Every revolutionary idea — in science, politics, art, or whatever — seems to evoke three stages of reaction. They may be summed up by the phrases:

(1) “It’s completely impossible — don’t waste my time”;
(2) “It’s possible, but it’s not worth doing”;
(3) “I said it was a good idea all along.”

— The Promise of Space (1968); This and similar statements attributed to Mahatma Gandhi and J. B. S. Haldane may ultimately be derived from a statement attibuted to Arthur Schopenhauer:

All truth passes through three stages.

First it is ridiculed.
Second it is violently opposed.
And third it is accepted as self-evident.

— As quoted in Seeds of Peace : A Catalogue of Quotations (1986) by Jeanne Larson, Madge Micheels-Cyrus, p. 244

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2010.06.21 Monday ACHK

馬拉松

Timetable for high school study 10.3.1

這段改篇自 2010 年 2 月 7 日的對話。

3 hours 理科
1 hour 語文
1 hour
3 hours 文科

我當年的高考科目是 physics(物理)、pure maths(純數學)和 applied maths(應用數學)。三科也是「理科」,所以我溫習時不能如我所願:一文一理。我所能做的,就是把它們不斷循環:

physics –> pure maths –> applied maths –> physics –> pure maths –> applied maths –> …

Monday Tuesday Wednesday Thursday Friday
3 hours Physics Applied Maths
1 hour Language Language Language Language Language
1 hour
3 hours Pure Maths
Monday Tuesday Wednesday Thursday Friday
3 hours Physics Applied Maths Pure Maths
1 hour Language Language Language Language Language
1 hour
3 hours Pure Maths Physics Applied Maths

然後,「語文科目」也不斷循環:

中文 –> 英文 –> 中文 –> 英文 –> …

Monday Tuesday Wednesday Thursday Friday
3 hours Physics Applied Maths Pure Maths Physics Applied Maths
1 hour Chinese English Chinese English Chinese
1 hour
3 hours Pure Maths Physics Applied Maths Pure Maths Physics

「不斷循環」的好處是,你不會長時間丟低任何一科。長時間丟低一科的話,當你要重新溫習該科時,你會很不舒服,因為很多細節都已經忘記了。溫習任何一科,也應好像「馬拉松」一樣,有些時候應該發力,有些時候不應發力,而改為緩步跑。但是,任何情況下,你也不應該停下來。停了之後再嘗試跑的話,你會格外辛苦。

— Me@2010.06.20

2010.06.21 Monday (c) All rights reserved by ACHK

Clarke’s three laws 3

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Arthur C. Clarke famously said, “Any sufficiently advanced technology is indistinguishable from magic.”  But in my house, any sufficiently advanced technology is broken, and no one knows how to fix it.

— Stick to Drawing Comics, Monkey Brain!

— Scott Adams

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2010.06.20 Sunday ACHK

Black hole thermodynamics

Beyond black holes

Hawking and Page showed that black hole thermodynamics is more general than black holes, that cosmological event horizons also have an entropy and temperature.

More fundamentally, ‘t Hooft and Susskind used the laws of black hole thermodynamics to argue for a general Holographic Principle of nature, which asserts that consistent theories of gravity and quantum mechanics must be lower dimensional. Though not yet fully understood in general, the holographic principle is central to theories like the AdS/CFT correspondence.

— Wikipedia on Black hole thermodynamics

2010.06.19 Saturday ACHK

Job: Meaning of Life 2

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Your life would have no meaning if you just stay at home, using all the time thinking about the meaning of life.

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Every day, we face thousands of problems.

In order to survive, we have to create thousands of solutions to those thousands of problems.

Some of your solutions are not only useful for yourself,

but also useful for a lot of others.

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Why not publish them?

— Me@2010.02.22

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2010.06.19 Saturday copyright ACHK

係咁咖啦

就是這樣的

(安:我們現在社會的運作方式,只是眾多可能方式的其中一個。而大部分人,卻想不到還有其他可能。)

不只是「想不到」,而是「不去想」。

(安:無錯。有很多人也患上了「係咁咖啦症候群」。他們不當地預設了「現存的東西/制度是『理所當然』的,所以不能改變,亦不應改變。」)

「係咁咖啦症候群」患者,不當地將「自己」和「社會/世界」分開了:「這個社會的人,控制這個社會怎樣運作。而我並不是「社會」,所以唯有接受現存的社會制度,即使自己有多麼不喜歡。」

他們忽略了,「自己」其實也是這個「社會」的一部分。

你的「社會」,就是社會中的其他人。而其他人中的每一個人的社會,其實是由他的「其他人」所組成。你是他的「其他人」。所以,你是他的「社會」的一部分。別人是你的「社會」,而你卻是別人的「社會」。

如果是「這個社會的人,控制這個社會怎樣運作」的話,那就即是「自己」也有份控制這個社會的運作制度,縱使各人控制權的大小不一。

— Me@2010.06.18

2010.06.19 Saturday (c) All rights reserved by ACHK

Images and animations

So, simplicity is key, and they purport to write such a system in a mere 20K LOC. To that end, they propose a sort of great unification theory of particles (homogeneous, extensible objects) and fields (the messages exchanged by myriad objects)—well, yes, it’s just a metaphor, but you can see it in action in the paper, applied to images and animations. The report also explains how the physical metaphor is completed with a proper simulation of the concept of time.

Reinventing programming
February 12, 2007 — jao

2010.06.18 Friday ACHK

Six Principles for Making New Things

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Here it is: I like to find (a) simple solutions (b) to overlooked problems (c) that actually need to be solved, and (d) deliver them as informally as possible, (e) starting with a very crude version 1, then (f) iterating rapidly.

If you work on overlooked problems, you’re more likely to discover new things, because you have less competition. If you deliver solutions informally, you (a) save all the effort you would have had to expend to make them look impressive, and (b) avoid the danger of fooling yourself as well as your audience. And if you release a crude version 1 then iterate, your solution can benefit from the imagination of nature, which, as Feynman pointed out, is more powerful than your own.

— Paul Graham

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2010.06.18 Friday ACHK

Timetable for high school study 10.2

這段改篇自 2010 年 2 月 7 日的對話。

3 hours 理科
1 hour 語文
1 hour
3 hours 文科

另外一點是,在我每天的溫習時間表中,也必須要有語文科目,即是 中文 或 英文。其他科目,你可以作短時期(例如三個月)的操練,令到成績有明顯的增長。但是,你要提升語文能力的話,一定要靠長年累月的反覆運用才行。所以,你應該堅持每天也有「溫習」語文的時間。而時間的長短,反而不是大問題。

那樣,應樣怎樣「溫習」語文科目呢?

一般人只會做 教科書練習 和 歷屆試題,然後再背一大堆文法規則等。那些都是必須要做的。但是,要大大提升語文修養的話,除了「必須品」以外,你還應該長年累月,「身處語文之中」。例如,我在中六(中學六年級)開始,要求自己每星期也看一本書。第一個星期看一本英文書,第二個星期看一本中文書,第三個星期看一本英文書,如此類推,不斷循環。而那些書一定要是「語文正確」和「內容深刻」的。

— Me@2010.06.17

「魔法時間表」詳情刊載於:

Half an Hour 2

Half an Hour 1

Timetable for high school study

請用本網誌左上角的搜尋器搜尋。

— Me@2010.06.15

2010.06.18 Friday (c) All rights reserved by ACHK

反白論前傳:冠名篇

Stigler’s law of eponymy is a process proposed by University of Chicago statistics professor Stephen Stigler in his 1980 publication “Stigler’s law of eponymy”. In its simplest and strongest form it says: “No scientific discovery is named after its original discoverer.” Stigler attributes its discovery to sociologist Robert K. Merton (which makes the law self-referencing).

— Wikipedia on Stigler’s law of eponymy

2010.06.17 Thursday ACHK

歷史 2

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Time dissipates to shining ether the solid angularity of facts.

— Ralph Waldo Emerson

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歷史,是凝固了的時間。

— Me@2010.06.16

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2010.06.17 Thursday copyright ACHK

大學的感覺 2.2

本科研究院 2.2

(安:那樣,即是我的講法是正確的。如果想做「大學者」,要先走入一個「學術圈子」。而最容易入到「學術圈子」的方法是,讀大學/研究院課程。)

正是。如果我繼續讀「博士課程」的話,我的主要目的不會是「拿博士學位」,而會是「結識一大班『學術朋友/同事』」。

(安:但是,如果現在為了加入一個「學術圈子」,而再報讀「大學/研究院課程」的話,對我來說,時間成本 和 金錢成本 實在太大。)

所以,你可以退而求其次,由「寫網誌」開始,從事你的學術活動。你的網誌可以吸引到一些與你志同道合的讀者。那樣,你就可以在電腦虛擬世界中,創造你的「學術圈子」。

— Me@2010.06.16

2010.06.17 Thursday (c) All rights reserved by ACHK