時空膠紙 1.1

尋找下一步 1.4 | Meaningful 11.4

這段改編自 2010 年 4 月 3 日的對話。

在個人無盡問題之中,金錢困難是典型的一個。所以,單單是賺錢本身,就已經是一個上佳的「長久娛樂」,雖然未至於是「無限旅程」。

而且,金錢還有一個驚奇有趣的特性。金錢是因果網絡的人工連接線,簡稱「時空膠紙」。明明原本沒有瓜葛的兩團因果網絡,如果可以用金錢連接,兩者就可以變成帶一點關係。

例如,你剛才埋怨:

我現在的那份工作,內容沒有什麼意義;好像在不斷大規模地,浪費著自己的生命似的。

意思是,你現時職位的工作內容,對人對己都沒有什麼大用,可有可無。你的工作對改善世界的影響力十分有限,甚至有時是負數。換句話說,你的「工作內部」和你的「理想生活」這兩個因果網絡,貌似互不相干。

但是,那不會是實情,因為,雖然你工作的性質無聊,但是它會為你帶來收入。透過你工作所賺來的金錢,你既可以提升自己的生活質素,又可以幫助別人,改善地球。換而言之,你的「工作內部」和你的「理想生活」這兩個因果網絡,因為「金錢」這種「時空膠紙」,人工地連接起來。

所以,理論上,你心中的「機會成本評價系統」,應該會為了賺錢,令你有心機、提起勁,去從事你日常的工作事務。

記住,「金錢」可以連接起「現實」和「理想」,有時。即使你的「現實」和「理想」,沒有自然直接的因果關係,在部分情況下,你仍可以透過「金錢」,人工搭建。

— Me@2013.06.30

2013.06.30 Sunday (c) All rights reserved by ACHK

Conscious time

Cumulative concept of time, 15

In 1895, in his novel, The Time Machine, H.G. Wells wrote, “There is no difference between time and any of the three dimensions of space except that our consciousness moves along it.”

— Wikipedia on Spacetime

Consciousness “moves” from the past to the future because consciousness is a kind of reflection.

To be conscious, one has to access its own states. But only the past states are available. Accessing one’s own now-here state is logically impossible, because that creates a metadox (paradox).

— Me@2013-06-26 02:28:51 PM

We can remember the past but not the future because the past is part of the future; the whole contains its parts, but not vice versa.

— Me@2011.08.21

2013.06.29 Saturday (c) All rights reserved by ACHK

Multinomial coefficient 2.1

二項式係數 4.1 | Binomial coefficient 4.1

這段改編自 2010 年 7 月 20 日的對話。

假設有 10 個友人,要乘坐計程車去郊遊。總共有兩輛計程車。第一輛車的載客量是 4 人,而第二輛的載客量是 6 人。換而言之,那 10 人要分成兩組乘車。那樣,總共有多少個分配方法呢?

你只要用二項式係數(binomial coefficient),就可以立刻知道答案。題目所問的,就相當於

如果要從那 10 人之中,抽 4 個出來(去乘坐第一輛車),總共有多少種抽法?

答案明顯是 10_C_4,即是「10 選 4」,等於 210。結論是,總共有 210 個可能的分配方法。

10_C_4 =

(10!)
——–
(4!)(6!)

另一個看法是,你直接把這題看成「分組問題」,用「多項式係數」(multinomial coefficient)去運算。

總共有 10 個人,所以分子是 (10!):

(10!)
——–
(__)

總共有兩組,所以分母有兩個因子:

(10!)
——–
(_)(_)

第一組有 4 個人,所以第一個因子是 (4!):

(10!)
——–
(4!)(_)

第二組有 6 個人,所以第二個因子是 (6!):

(10!)
——–
(4!)(6!)

結論同樣是,如果第一輛車載 4 名乘客,而第二輛車載 6 名,總共就有 210 個,可能的分配乘客方法。

(CYW:但是,我覺得應該不止有 210 個可能性,因為抽某 4 個人出來時,本身有很多個抽法。假設「甲、乙、丙、丁」四人被抽中,去乘坐第一輛車,「先抽甲出來」和「先抽乙出來」,就已經是兩個不同的可能性。我不太明白,為什麼毋須考慮這一點?)

— Me@2013.06.29

2013.06.29 Saturday (c) All rights reserved by ACHK

Fluctuation-dissipation Theorem

[The fluctuation-dissipation theorem (FDT) is a] fundamental result in statistical physics which links microscopic (thermal) fluctuations with the macroscopic property that creates a drag force on a particle in a medium.

— by Zap

— Thu May 09 2002 at 16:48:10

— Everything2

The fluctuation-dissipation theorem (FDT) is a powerful tool in statistical physics for predicting the behavior of non-equilibrium thermodynamical systems. These systems involve the irreversible dissipation of energy into heat from their reversible thermal fluctuations at thermodynamic equilibrium.

— Wikipedia on Fluctuation-dissipation Theorem

2013.06.28 Friday ACHK

魔間傳奇 1.3

.

I’m the last survivor of a dead culture. And I don’t really belong in the world anymore. And in some ways I feel I ought to be dead. I have certainly wished I had killed myself when I was born.

In terms of effect on the world, it’s very good that I’ve lived. And so I guess, if I could go back in time and prevent my birth, I wouldn’t do it. But I sure wish I hadn’t had so much pain.

– Richard Stallman, inventor of the Copyleft

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.

.

2010.06.26 Saturday ACHK

尋找下一步 1.3

Meaningful 11.3

這段改編自 2010 年 4 月 3 日的對話。

微觀一點,你可以集中解決,你自己的個人問題。人生本來就是,問題無窮,煩惱無盡。那就保證了,「解決問題」這個旅程,一定是沒完沒了,一直可以玩下去。

那亦是為什麼孟夫子會說,生於憂患,死於安樂。

「憂患」即是「很多問題」。你可以透過解決,或都躍過那些問題,衍生出很多「下一步」,從而感受到人生的「意義」。你的人生道路,是一個「無限旅程」,因為有無限個「下一步」;那就為之「生路」。

記住,「有意義」的同近義詞有

~ 不斷地有下一步

~ 有用處

~ 有價值

「安樂」即是「太少問題」。在過份「安樂」的處境,你可以透過化解問題,來創造出來的「下一步」數目,非常有限。你自然會體會到人生的「空虛」。你的人生道路,是一個「有盡旅途」,又名「窮途末路」,因為只有有限個「下一步」;那就為之「死路」。

每個人的腦海中,都有一個「機會成本評價系統」,會自動刪除沒有「用處」的東西。當你的潛意識偵察到,你的生活並不是「不斷地有下一步」時,自然會標籤你自己為「沒有用」,企圖把他「刪除」。「刪除」自己的方法五花八門,洋洋大觀,包括「多病多痛」、「昏昏欲睡」和「精神恍惚」等。那些都是令你虛度光陰的有效方法。

— Me@2013.06.26

2013.06.27 Thursday (c) All rights reserved by ACHK

Past and Future

The past cannot be changed” is a tautology, because “cannot be changed” is included in the meaning of the word “past“.

Similarly, “the future is not fixed” is also a tautology.   

Anything you cannot change is within your past.

Anything you can change is within your future.

— Me@2013-06-23 3:40 PM

— Me@2013-06-26 10:40 AM

2013.06.26 Wednesday (c) All rights reserved by ACHK

似水流年 2

隨時間走過 你變了幾多?

– 李克勤 白紙鶴

1994-1997 理科學生
1997-1999 數學學生
1999-2002 工程學生
2002-2004 工程研究生

2005-2008 數學老師
2008-2010 物理學生
2010-2013 小作家
2013-

— Me@2008.09.07

— Me@2013.06.26

2013.06.26 Wednesday (c) All rights reserved by ACHK

時間止血 1.6

止蝕 3.6 | 活在當下 4.6

這段改編自 2010 年 7 月 20 日的對話。

又例如,我年青時往往會因為.浪費了時間而內疚。後來我發現,人其實有「浪費時間」的心理需要。

我不容許自己浪費時間,往往導致我浪費過多的時間。當我的思考顯意識,企圖毫無保留地,迫自己百分百「善用時間」時,我的身體潛意識,就會不留餘地地,浪費人類所能達到,最多的時間。 

記住,陽之極為陰,陰之極為陽;物極必反,過猶不及。

「浪費時間」是天賦人權,不單毋須自責,而且要主動捍衞。重要的是,適可而止,不要過量;要把「浪費時間」這一隻「小魔怪」,放一個可控制的範圍以內,妥善照顧,恰當利用。

再記住,單車(自行車)並不能真的「行直線」。單車在「行直線」時,並不是真的「不會偏左偏右」,而是「每逢偏左時,就立刻偏右;每逢偏右時,就立刻偏左」。結果,錯覺上,單車貌似可以「行直線」。

如果你在編時間表時,預早安排了一些,用來「浪費時間」的空格,那樣,「浪費時間」這活動,就自然受到控制。

留意,我這裡所指的「浪費時間」,並不是指「娛樂」或者「遊玩」,而是指真的不知在做什麼;漫無目的地,存在於這個宇宙之中。那是名符其實、貨真價實的「浪費時間」,又名「百無聊賴」、「不務正業」和「無所事事」等。

— Me@2013.06.25

2013.06.25 Tuesday (c) All rights reserved by ACHK

Oceanographers

In any intellectual field, one can reach greater heights by standing on the shoulders of others. But that is no longer generally allowed in the software field — you can only stand on the shoulders of the other people in your own company.

The associated psychosocial harm affects the spirit of scientific cooperation, which used to be so strong that scientists would cooperate even when their countries were at war. In this spirit, Japanese oceanographers abandoning their lab on an island in the Pacific carefully preserved their work for the invading U.S. Marines, and left a note asking them to take good care of it.

Conflict for profit has destroyed what international conflict spared. Nowadays scientists in many fields don’t publish enough in their papers to enable others to replicate the experiment. They publish only enough to let readers marvel at how much they were able to do. This is certainly true in computer science, where the source code for the programs reported on is usually secret.

— Why Software Should Be Free[1]

— Richard Stallman

[1] Free software is a matter of liberty, not price. To understand the concept, you should think of free as in free speech, not as in free beer. — Richard Stallman

2013.06.25 Tuesday ACHK

尋找下一步 1.2

Meaningful 11.2

這段改編自 2010 年 4 月 3 日的對話。

(安:除了「時刻檢查訊息」外,人類很多其他奇怪的表現,例如「過量購物」,都可以講成,因為想「尋找下一步」。

購買一件新物件,好像可以為生活,帶來一點點新改變、新衝擊。但是這個「減少空虛感」的功效,又真的只有「一點點」。這些滿足感很快會過,自己又會打回原形。

我又未至於「沉迷購物」的地步。但是,我有時都會不自覺地,買了一些沒有需要的東西。

回想起來,我又真的感受到,人生不知如何發展下去。我都希望盡快找到,生活的出路,真正的下一步。)

「沉迷」就即是「不能自拔」;意思是,寧願跳進一個虛假的,有限大的因果網絡,都不願意去面對現實的,無限大的人生故事。

只要自己的人生,有至少一個「無限旅程」,你就「不斷地有下一步」,簡稱「不斷有進步」。你自然會感受到「人生的意義」,因為「意義」即是「下一步」。

「無限旅程」的例子有「科學研究」、「科技發明」和「疑難排解」。

宏觀一點,你可以研究科學,或者發明科技。

微觀一點,你可以集中解決,你自己的個人問題。人生本來就是,問題無窮,煩惱無盡。那就保證了,「解決問題」這個旅程,一定是沒完沒了,一直可以玩下去。

— Me@2013.06.24

2013.06.24 Monday (c) All rights reserved by ACHK

Creator

Assume that your existence is a property of X. Then in order to create you or annihilate you, X has to change the corresponding property.

For example, “having beard” is a property of me. In order to destroy that beard, I have to be willing to change my property of “having beard” to “having no beard“.

— Me@2013-06-11 2:30 AM

2013.06.24 Monday (c) All rights reserved by ACHK

Consciousness 3

Copy Me, 4

Being conscious is being able to form memories.

forming memories

~ forming an identity

~ forming a causal chain of thoughts

To form memories, one needs to access and then store its own states.

But due to metadox (paradox), no one, or no single part of the brain, can access its own now-here state directly.

That is why different parts of the brain have to communicate and coordinate in order to be conscious.

— Me@2013-05-30 1:47 PM

2013.06.23 Sunday (c) All rights reserved by ACHK

時間止血 1.5

止蝕 3.5 | 活在當下 4.5

這段改編自 2010 年 7 月 20 日的對話。

第一天,你會因為錯失甲,導致遲起牀。那樣,你只要認清甲,就不會再犯。第二天,你會因為缺點乙,導致睡過頭。那樣,你只要了解乙,就不會重複。第三天,如此類推。逐漸地,你會越來越詳細地理解,一些支配自己思想和身體的自然定律。

你會發現,自己一些日常處事的固有模式。你會察覺,你不能準時起牀,往往是因為你編排時間表時,企圖違反自然定律。 

例如,我時常想在星期日早起,但是近乎次次也做不到,然後怪責自己。後來我發覺,「星期日早起不到」並沒有錯;真正錯的是,「星期日早起」這個「企圖」本身。

每個人的腦海中,都有一個「機會成本評價系統」。在平時星期一至六要上班的日子,其實持續地睡眠不足,身心疲累。我的身體潛意識為了保護自己,避免生病,自動會在假期睡得多一點,無論我顯意識的企圖是怎樣。

相反,如果我顯意識的意志力,驚人到可以凌駕身體的自我保護機制,堅持在星期日早起,我的身體就會支持不住,生病了事。我以前就試過類似的情形,以為自己可以呼風喚雨,百分之一百依足時間表行事,結果在臨考試前病了,被迫帶病上陣,因小失大,得不償失。

合理的做法是,如果要星期日早起,你就要保證平日的睡眠充足;如果平日的睡眠不足,編時間表時,就不要企圖在星期日早起。

— Me@2013.06.23

2013.06.23 Sunday (c) All rights reserved by ACHK

Eigenstates 2.3

So, after all, what is the meaning of “a quantum eigenstate”?

One way to resolve the circular definition is to define

a definite state

as

a state whose measurement result can be predicted with 100% certainty provided that the initial condition is given with 100% accuracy

Another way to resolve the circular definition is to realize that

1. a classical state, as a macroscopic definite state, is experimental or observational;  

2. a quantum eigenstate, as a microscopic definite state, is conceptual.

A classical state is what we, as macroscopic observers, can see directly.

A quantum eigenstate is what we cannot see. Moreover, it is not absolute. For the same system, there are more than one choice of state vector bases, in the sense that different sets of measurements can get different sets of eigenstates.

The concept of “quantum eigenstates” exists because we insist to express quantum states in terms of daily-life (classical (macroscopic) physics) language.

— Me@2013.06.22

2013.06.22 Saturday (c) All rights reserved by ACHK

魔間傳奇

.

I Am Legend (1954)

* Sometimes he had indulged in daydreams about finding someone. More often, though, he had tried to adjust to what he sincerely believed was the inevitable — that he was actually the only one left in the world. At least in as much of the world as he could ever hope to know.

– Richard Matheson

.

.

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2010.05.21 Friday ACHK

尋找下一步 1.1

Meaningful 11.1

這段改編自 2010 年 4 月 3 日的對話。

I get mail; therefore I am.

― Scott Adams

有些人會時刻檢查電子郵件信箱,或者檢視手提電話短訊,其實都是為了「尋找意義」。換句話說,檢查訊息,是一個「尋找下一步」的過程。你期望可以接收到新的訊息,從而證實自己仍然存在、仍然有價值。

但是,「時刻檢查訊息」並不是一個「尋找下一步」的理想方法,因為它治標不治本;通常也不會為你的人生,衍生出一個無限長的新故事。

即然自己的顯意識明知,「時刻檢查訊息」並沒有用,為什麼自己的潛意識,仍然會慫恿自己那樣做呢?

那是因為他走投無路。你的潛意識發現,你的生活日日如是,未有進步,缺乏長遠意義,沒有下一步。在沒有「真正下一步」的情況下,你的潛意識兩害取其輕,寧願追求「虛幻下一步」,都不願意「沒有下一步」。

— Me@2013.06.21

2013.06.21 Friday (c) All rights reserved by ACHK

Virtual particle

The Matrix, 4

However, the longer a virtual particle exists, the more closely it adheres to the mass-shell relation. A “virtual” particle that exists for an arbitrarily long time is simply an ordinary particle.

However, all particles have a finite lifetime, as they are created and eventually destroyed by some processes. As such, there is no absolute distinction between “real” and “virtual” particles. In practice, the lifetime of “ordinary” particles is far longer than the lifetime of the virtual particles that contribute to processes in particle physics, and as such the distinction is useful to make.

— Wikipedia on Virtual particle

The difference between the real world and a virtual world is that reality lasts longer. 

— Me@2013.06.20

2013.06.21 Friday (c) All rights reserved by ACHK