# Bell’s theorem

Quantum coherence

The quantum description of perfectly coherent paths is called a pure state, in which the two paths are combined in a superposition. The correlation between the two particles exceeds what would be predicted for classical correlation alone (see Bell’s inequalities).

— Wikipedia on Quantum coherence

2011.09.30 Friday ACHK

# Lightning a fire

— 尼采

Teaching is not filling a vase, but lighting a fire.

— Michel de Montaigne

Teaching is not filling a vase, but lightning a fire.

— Me@2005

— Me@2007.08.21

— Me@2010.11.28

# 疫苗筆記

Probability

Always make new mistakes, 6

（HYC: Probability（機會率）的題目要麼就是全題對，要麼就是全題錯，令人惶恐非常。）

Probability 的題目，我自己也很驚。我暫時也沒有辦法，保證自己運算正確。那樣，你可以做些什麼，來提高準繩度呢？

Probability 的題目最驚嚇的地方是，它們貌似幾乎沒有任何步驟。錯了一題後，想知自己在哪一步的思考有漏洞，對初學者來說，是一個不可能的任務。

「貌似沒有步驟」所衍生的另一個大問題是，在考試途中，你不知如何驗算。

（這兩個問題，我在去年破解了。 — Me@2011.09.29）

— Me@2011.09.29

# Complementarity

Quantum coherence, 1

Berthold-Georg Englert, Marlan O. Scully & Herbert Walther, Quantum Optical Tests of Complementarity, Nature, Vol 351, pp 111–116 (9 May 1991) and (same authors) The Duality in Matter and Light Scientific American, pg 56–61, (December 1994). Demonstrates that complementarity is enforced, and quantum interference effects destroyed, by decoherence (irreversible object-apparatus correlations), and not, as was previously popularly believed, by Heisenberg’s uncertainty principle itself.

— Wikipedia on Complementarity (physics)

2011.09.28 Wednesday ACHK

# 緬懷過去

If your life gets better and better, you will not miss the past.

— Me@2011.09.25

# 缺乏寫作靈感

— Me@2011.09.27

… if you can’t get started, tell someone what you plan to write about, then write down what you said …

— Writing, Briefly

— Paul Graham

# Mach principle

The broad notion is that “mass there influences inertia here”.

— Wikipedia on Mach principle

Mach principle states that the inertial mass of an object is due to (the gravitational influences of) other objects.

In other words, the inertial mass of an object is due to the gravitational mass of itself and the gravitational masses of other objects.

— Me@2011.09.24

# Change

change = delete the old one + create a new one

— Me@2010.11.28

# 下一位

2004 年，我參加碩士畢業禮時，

— Me@2007

# A purpose of life

“A purpose of life” is to locally decrease the entropy

which is pretty unusual among the natural phenomena.

— Ten new things modern physics has learned about time

— Lubos Motl

2011.09.25 Sunday ACHK

# Larry Page

His burning passion was to help the world stop wasting his time.

— I’m Feeling Lucky, p. xiii

— Douglas Edwards

2011.09.25 Sunday ACHK

# 讀書與睡眠 4

— Me@2011.09.24

[1] I Want to Be a Mathematician, by Paul R. Halmos

# Meta-unification

AdS/CFT is a unification of field theory and string theory – a kind of spectacular meta-unification, too.

— Unification as a source of certainty

— Lubos Motl

2011.09.24 Saturday ACHK

# Agent Smith

Have you ever stood and stared at it, marveled at its beauty, its genius? Billions of people just living out their lives, oblivious. Did you know that the first Matrix was designed to be a perfect human world, where none suffered, where everyone would be happy? It was a disaster. No one would accept the program, entire crops were lost. Some believed we lacked the programming language to describe your perfect world, but I believe that, as a species, human beings define their reality through misery and suffering. The perfect world was a dream that your primitive cerebrum kept trying to wake up from. Which is why the Matrix was redesigned to this, the peak of your civilization. I say your civilization, because as soon as we started thinking for you it really became our civilization, which is of course what this is all about. Evolution, Morpheus, evolution. Like the dinosaur. Look out that window. You had your time. The future is our world, Morpheus. The future is our time.

— Agent Smith

— The Matrix

2011.09.24 Saturday ACHK

— Me@2011.09.23

# Momentum and electric charge

In fact, all the dualities in string theory are obviously examples of unification. The electric charge is unified with the momentum of a particle; this insight was already known to Kaluza or at least Klein. That’s true because the electric charge is the generator of an isometry in a new 5th circular dimension – which is the momentum in this direction.

— Unification as a source of certainty

— Lubos Motl

2011.09.22 Thursday ACHK

# 軟硬智力 2

Software in small becomes hardware in big:

is your intelligence software installed when you were small.

— Me@2011.09.21

.

.

# 讀書與睡眠 3

（安：你講過，Stephen Covey 的講法，通常也不會不切實際。你所舉的例子是，有一個讀者問他：「我想開一間咖啡館，哪我好不好辭去我的工作呢？」Stephen Covey 回答：「不要。先留住你現時的職位。執行你的理想往往比你想像中困難。所花的時間亦會比你想像中長。最好是先留住你現時的工作，然後用工餘的時間經營咖啡館的事務。〔如果你在咖啡館成功前就辭去現時的工作的話，你很可能沒有足夠金錢維生。〕」

「留住現時的工作，然後用工餘的時間經營自己的理想」我覺得十分合理，適合絕大多數人。但是，執行起來，我遇到一個實際的困難，就是 …）

（安：不是。我有工餘時間。而且，我的工餘時間，比一般受僱人士為多。但是，我在工餘時間的精神很差，集中不到心智去實行自己的理想，例如閱讀。

— Me@2011.09.21