Lucid dream

潛行凶間 15 | Inception 15 | 清醒夢

Level 1: have a lucid dream

Level 2: hold the lucid dream

Level 3: un-collapse it while it is collapsing

— Me@2011.07.05

2014.07.30 Wednesday (c) All rights reserved by ACHK

反白論起點 2.1

這段改編自 2010 年 4 月 10 日的對話。

Chapter 17 (第十七章)

太上,下知有之;
其次,親而譽之;
其次畏之;
其次侮之。
信不足焉,有不信焉。
悠兮,其貴言,
功成事遂,
百姓皆謂我自然。

Great rulers are hardly known by their subjects,
    Then come those the people draw near and praise,
    Then those the people hold in fear,
    Then those the people revile.
    When one lacks trust, one finds no trust.

Reluctantly, without boasting;
Perform actions, accomplish deeds;
The people will say it happened naturally.

— Tao Te Ching (Wikisource translation)

老子的《道德經》之中提到,最佳的領袖,就是那些人民不覺其存在的領袖。人民反而會以為,這個領袖好像無所作業,可有可無。

(安:我現在的上司,就沒有這個智慧。我上司很刻意地,要下屬知道他的存在,繼而再顯示自己的存在價值。

我上司的管理方法,就是 Joel Spolsky 所講的「hit and run micromanagement」。「Hit and run」的原本意思是,駕車撞到人後,不顧而去;學名叫做「肇事逃逸」。

把我上司的管理方法,如果真是「方法」的話,比喻成「肇事逃逸」的原因是:

他有太多下屬,所以他其實不太知道,下屬正在執行的工序是什麼。即使知,也不會知其詳情。所以,他為下屬工作所出的主意,通常也有害無利,只會打亂下屬的工作流程,干擾公司的正常運作。

但是,他自己是不會知道那些惡果的,因為,他下了令後,就立刻走到另一組下屬的工作單位,繼續故亂下令。

從任何一個下屬的角度看,我上司就是「肇事逃逸」—— 他一時衝動,下了一些不經大腦的指令後,立刻不顧而去,導致引發一片混亂,傷亡慘重。)

無錯。上司時常無故出現的公司,不會是效率高的公司。

— Me@2014.07.28

2014.07.30 Wednesday (c) All rights reserved by ACHK

For all, 7

Whatever you (physically or mentally) encircle, it is part of the universe, not the universe.

If you claim that what you have encircled is the whole universe, I will ask,

“How can you know?” 

If you define the word “universe” as “everything“, how can you know that there are no other parts unknown to you?

— Me@2014-07-27 02:50:20 PM

2014.07.27 Sunday (c) All rights reserved by ACHK

無額外論 4.3

Onion self 6.3 | Cosmic religion 3.2

~~~~~

十誡中的第一誡,原文(的一部分)是:

「除了我之外,不可有別的神。」

一個特別的詮釋是,摩西領悟到:

「除了『我』之外,不可有別的神。」

~~~~~

摩西面見神時,詢問神的名字。

摩西:你是誰?

Who are you?

神:雅威。

I AM.

一個特別的詮釋是:

摩西:神呀,你是誰?

Who are you?

摩西領悟到:我就是。

I am.

~~~~~

— Me@2014-07-05 09:38:36 AM

2014.07.26 Saturday (c) All rights reserved by ACHK

無限倍 2

二十分開始 2

這段改編自 2010 年 8 月 5 日的對話。

昨天,HYC 跟我說,她不肯做化學科 past paper(過往試題)的原因是,她一嘗試開始做,就發覺幾乎題題也不懂做。結果,就只拿得 20 分,十分難看。

但是,你要意會到,你要一日未開始做,化學科的 past paper,你化學科的功力,就連那 20 分也沒有。你只有 0 分。

相反,如果你開始做了,第一份的 past paper,得到 20 分的話,你就是由 0 分進步至 20 分。試想想,由 0 分進步至 20 分,是進步了多少倍?

(CSY:無限倍。)

(CPK:哈哈!)

不是嗎?

— Me@2014.07.23

2014.07.23 Wednesday (c) All rights reserved by ACHK

LogGamma

Another way to compute the binomial coefficient when using large numbers is to recognize that


{n \choose k} = \frac{n!}{k!\,(n-k)!} = \frac{\Gamma(n+1)}{\Gamma(k+1)\,\Gamma(n-k+1)} = \exp(\ln\Gamma(n+1)-\ln\Gamma(k+1)-\ln\Gamma(n-k+1)),

where ( \ln \Gamma(n) ) denotes the natural logarithm of the gamma function at n. It is a special function that is easily computed and is standard in some programming languages such as using log_gamma in Maxima, LogGamma in Mathematica, gammaln in MATLAB, or lgamma in R. Roundoff error may cause the returned value to not be an integer.

— Wikipedia on Binomial coefficient

2014.07.23 Wednesday ACHK

共同理想

除了建立家庭外,很少情侶有共同理想。

長久而言,那會導致「談戀愛」時,沒有什麼好談。

— Me@2011.07.03

— Me@2014.07.22

2014.07.22 Tuesday (c) All rights reserved by ACHK

大甲等人 5.2

這段改編自 2010 年 4 月 10 日的對話。

愛情上,也有類似的現象。

大部人受到別人追求時,如果對方的條件太好,即使自己十分喜歡,也不敢接受;因為,對方條件太好的話,你會覺得,她可能隨時會離開自己,十分沒有安全感。

那並不是一個健康的心態。安全感不應建基於,別人的同情。安全感亦不應建基於,別人的弱勢。

安全感應該建基於,自己的才智實力和完整人格。

我在舊網誌寫過,大部分情況下,與他人相處時,無論你倆是什麼關係,也

不要強勢, 不要弱勢, 要平等. – Me@2009.10.06

而「平等」在這裡的意思是,互相尊重。

— Me@2014.07.21

2014.07.21 Monday (c) All rights reserved by ACHK

The ultimate fate of black holes, 2

Dear @anna, yes, the electron is pretty likely to be the last “remainder” of a black hole. Before it becomes an electron, the black hole may be a W boson that decays into an electron and a neutrino. Before it was a W boson, it could have been a much more excited string state… – Lubos Motl Feb 28 ’11 at 8:18
     
… the conclusion that black hole microstates are continuously connected to (other) elementary particle species – there’s no qualitative difference – doesn’t really depend on specific features of string theory. It’s a general fact that strings just confirm and make more specific.

— Physics Stack Exchange

— user contributions licensed under cc by-sa 3.0 with attribution required

— Mar 1 ’11 at 15:20

— Lubos Motl

2014.07.21 Monday ACHK

二十分開始

這段改編自 2010 年 8 月 5 日的對話。

你們有沒有做,物理科的 past paper(過往試題)?

(CPK:有。)

做沒有計算分數?

(CPK:有呀!)

你這次頗為高分。那是不是很振奮人心?

所以,你科科也應這樣做。

化學科呢?有沒有做 past paper?

(CPK:未呀。)

很多人也是那樣,不肯開始做某些科目的 past paper。

為什麼不做呢?

如果你第一次做,某一科按年份的 past paper,例如化學科,你要有心理準備,你得到的分數,將會奇低,例如只有 20 分。

昨天,HYC 跟我說,她不肯做化學科 past paper 的原因是,她一嘗試開始做,就發覺幾乎題題也不懂做,十分難看。

(CPK, LMC:係呀…)

你要記住,如果一個錯誤你平日未犯過,你在考試時,就很可能會犯。那如何保證考試時,不會犯那個錯誤呢?

就是在考試前,盡早先犯一次,從中學習,自此免疫。

你並不能選擇,犯不犯某個錯誤。你只能選擇,考試前犯,還是考試時犯。

換句話說,大概而言,按年份做 past paper 時,你要經歷過 20 分,才能得到 30 分;你要經歷過 30 分,才能得到 40 分;如此類推。

抱著這個心態的話,你就不會因為「怕低分怕難看」,而不敢開鈶按年份做 past paper。

例如,你今個星期做 2000 年的那一份化學科試題,只有 20 分。那樣,你就從中學習,從而,在下個星期的那一份,即是 2001 年試題,進步 5 分。

雖然 20 分進步了 5 分,亦只有 25 分,但是,你不要看小那 5 分。如果你每星期也按年份做一份 past paper,從而進步 5 分,試想想,你三個月後,會進步了多少分?

— Me@2014.07.20

2014.07.20 Sunday (c) All rights reserved by ACHK

The ultimate fate of black holes

Are elementary particles ultimate fate of black holes?

From the “no hair theorem” we know that black holes have only 3 characteristic external observables, mass, electric charge and angular momentum (except the possible exceptions in the higher dimensional theories). These make them very similar to elementary particles. One question naively comes to mind. Is it possible that elementary particles are ultimate nuggets of the final stages of black holes after emitting all the Hawking radiation it could?

Yes, black holes are special kinds of elementary particles. That’s how they have to be represented in every consistent quantum theory of gravity. This representation of a black hole becomes especially useful and important for small black holes – whose mass is not much larger than the Planck mass.

And indeed, a black hole evaporates, which is just a form of a decay of a heavy elementary particle, and when it becomes very light, at the end of the Hawking evaporation process, it is literally indistinguishable from a heavy elementary particle that ultimately decays into a few stable elementary particles.

However, a difference that you seem to neglect is that black holes actually carry a large entropy

S = \frac{A}{4A_0} k_B

where A is the area of the black hole’s event horizon and ( A_0 ) is the Planck area ( A_0=\hbar G / c^3 ). The constant ( k_B ) is Boltzmann’s constant. This means that there actually exists a huge number of microstates

N = \exp(S / k_B)

and a single black hole, with a fixed value of mass, charges, and spin, is just a macroscopic description of the ensemble of N “microstates”. In reality, the black hole carries a huge information – the world distinguishes which of the N microstates is actually present.

It is these “microstates” that are really analogous to types of elementary particles. But the number of particle species that macroscopically look like the black hole of given mass, charges, and spin is not one: instead, it is huge, approximately N.

— Physics Stack Exchange

— user contributions licensed under cc by-sa 3.0 with attribution required

— answered Feb 27 ’11 at 16:45

— Lubos Motl

2014.07.18 Friday ACHK

I Am Legend

Fair use rationale for I Am Legend

No free equivalent exists that would effectively identify the article’s subject.
The image does not in any way limit the ability of the copyright owners to market or sell their product.
The image is only used once and is rendered in low resolution to avoid piracy.

I Am Legend is a 2007 British-American post-apocalyptic science fiction horror film directed by Francis Lawrence and starring Will Smith. It is the third feature film adaptation of Richard Matheson’s 1954 novel of the same name, following 1964’s The Last Man on Earth and 1971’s The Omega Man. Smith plays virologist Robert Neville, who is immune to a man-made virus originally created to cure cancer. He works to create a remedy while defending himself against mutants created by the virus.

— Wikipedia on I Am Legend (film)

2014.07.16 Wednesday ACHK

受威脅招聘法

大甲等人 5

這段改編自 2010 年 4 月 10 日的對話。

我看過一篇有關電腦界創業的文章。

大部人僱主,或者招聘部人員,也不敢聘請才華太出眾的應徵者,因為怕自己在公司的地位,受到威脅。而最高級的僱主,即是之前所講的「大甲等人」,就偏偏逆此趨勢而行。

「大甲等人」的招聘哲學是,凡是才智未高到,足以威脅到(招聘者)自己地位的應徵者,都不會考慮。換句話說,「大甲等人」只會聘請,有機會威脅到自己的應徵者。

後果是,公司越來越強大。

— Me@2014.07.16

2014.07.16 Wednesday (c) All rights reserved by ACHK

On Keeping Your Soul, 2

Als 4 days ago

I’m happy to see that you still work on string theory. Do you intend to start publishing again?

Lubos Motl Als 3 days ago

No, I do not.

Kimmo Rouvari Lubos Motl 3 days ago

Why? (just curious) Obviously you have ideas and something to say.

Lubos Motl Kimmo Rouvari 3 days ago

I just virtually never had a real pleasure out of this process which has something like dozens of consumers in the world in average and which is laborious and demanding various formalities. This part of what I would be doing was always more or less just work and I was doing these things as a part of the package for the salary.

I am not getting the income for that, I am not a communist who would think it’s really right to do the expert work for free, so I won’t do these things. I think it’s common sense and it’s very simple.

I am sufficiently frustrated when I just report on someone’s excellent paper and the feedback is 100 times less excited than the feedback following some anti-science rant by a worthless sithead … And that’s something I may ignore because it’s just not my business.

— Lubos Motl

2014.07.15 Tuesday ACHK

Open Source MindOS, 2.3

朋友同事 5.3 | 已婚單身 2.3 | Singles 2.3

這段改編自 2010 年 4 月 10 日的對話。

拍拖(談戀愛),是一個「互相改變」的過程。

無傷大雅的缺點,你可以選擇不改,因為更改太快太多,會十分煩厭。但對於事關重大的缺點,你不敢不改。

要發現和改正自己的缺點,往往需要一個,十分瞭解你的人,加以提醒和指導。而拍拖,就正正是那個「互相修正」和「互相創造」的過程。

M. C. Escher

Though this image is subject to copyright, its use is covered by the U.S. fair use laws because

1. It illustrates an educational article …
2. It is a low resolution image.
3. It is not replaceable with an uncopyrighted or freely copyrighted image of comparable educational value.

「不斷修正」和「不斷創造」的後果是,雙方各自也不斷重生成,新版本的自己。二人對於對方來說,也會不斷帶來新鮮感。那樣,愛情方能長久。

— Me@2014.07.14

2014.07.14 Monday (c) All rights reserved by ACHK

天外救星 3C

Deus ex machina 3C

「時間旅行」、「蟲洞」、「平行宇宙」、「奇蹟」等情節,都是「天外救星」。它們的出現往往代表,該故事有著,不可修補的漏洞。

故事凡是時間錯亂,就宣稱是「時間旅行」。

故事凡是地點有誤,就宣稱是「瞬間轉移」。

故事凡是自相矛盾,就宣稱是「平行宇宙」。

故事凡是有違常理,就宣稱有「奇蹟」。

— Me@2014-07-11 04:59:55 PM

2014.07.13 Sunday (c) All rights reserved by ACHK

Deus ex machina 3

天外救星 3

Time travels, wormholes, parallel universes, miracles are all deus ex machina.

When a story’s author uses those deus ex machina, it means that the story broken, in the sense that the story has plot holes that the author cannot fix. 

With time travel, the story’s time logic is given up. With wormholes, the story’s space logic is given up. With parallel universes, the story’s internal consistency is given up. With miracles, the story’s scientific consistency is given up.

— Me@2014-07-12 01:15:25 PM

2014.07.13 Sunday (c) All rights reserved by ACHK

Deus ex machina 2

天外救星 2

Towards the end of the 19th century, Friedrich Nietzsche criticized Euripides for making tragedy an optimistic genre via use of the device, and was highly skeptical of the “Greek cheerfulness”, prompting what he viewed as the plays’ “blissful delight in life”.

Nietzsche argues that the deus ex machina creates a false sense of consolation that ought not to be sought in phenomena.

— Wikipedia on Deus ex machina

2014.07.12 Saturday ACHK