# 程式員頭腦 4

（安：大部分都沒有”寫程式的能力”。他們不會去偵測自己的知識網中有什麼錯漏，更加不會去改正。）

— Me@2010.01.26

# 程式員頭腦 3

（安：你覺得你這種”寫程式能力”，有沒有方法培養？又或者問，你自己是怎樣培養出來的？真係透過寫程式？）

— Me@2010.01.26

# 程式員頭腦 2

（安：程式可以立刻試run，…）

1. 同一個字眼可以有超過一種意思。

2. 同一個意思下，有分狹義和廣義。

3. 同一個字眼的兩個不同意思，又可能有關係。

— Me@2010.01.25

# 機械人

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（安：會唔會可以降低o的要求：唔需要”非常有料到”，而係”somehow有料到”？）

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（Me：你想唔想像到我o既意思呀？呢個比喻O唔OK呀？駛唔駛諗個再勁o的咖？

Me：OK喎…我講o個陣，都諗唔到呢樣野…）

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— Me@2010.01.25

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2010.01.26 Tuesday $copyright ACHK$

# 機械人

（安：會唔會可以降低o的要求：唔需要”非常有料到”，而係”somehow有料到”？）

（Me：你想唔想像到我o既意思呀？呢個比喻O唔OK呀？駛唔駛諗個再勁o的咖？

Me；OK喎…我講o個陣，都諗唔到呢樣野…）

— Me@2010.01.25

# Functionals of fields

However, the path integral formulation is also extremely important in direct application to quantum field theory, in which the “paths” or histories being considered are not the motions of a single particle, but the possible time evolutions of a field over all space.

Much of the formal study of QFT is devoted to the properties of the resulting functional integral, and much effort (not yet entirely successful) has been made toward making these functional integrals mathematically precise.

— Wikipedia on Path integral formulation

2010.01.25 Monday ACHK

# 心海 2

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The ultimate definition of success in life is

that your spouse likes and respects you ever more

as the years go by.

— Jim Collins, in his Good to Great

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— Me

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2010.01.25 Monday $copyright ACHK$

# 程式員頭腦

（安：…我覺得在這些例子我幾critical（批判）。〔但我不是任何情況下都critical，所以〕我在想，我有多少情況下是critical，多少情況下不critical。這很視乎我的知識網…）

（安：你這個”feel到”是一看一聽就立刻做到？）

（安：是經過反思之後才”feel到”？）

（安：這個我又覺得好有火花：”寫程式能力”這個講法。）

〔其他範疇則不需要這一種能力。〕例如，數學家的數學推導，可能中途其中的一兩步有錯。所以，當一個數學家將數學推論發表成學術文章後，其他數學家要花時間檢驗，看看有沒有錯漏。

（安：但是數學都不可以有錯…）

— Me@2010.01.24

# Propagator

In relativistic theories, there is both a particle and field representation for every theory. The field representation is a sum over all field configurations, and the particle representation is a sum over different particle paths.

— Wikipedia on Path integral formulation

2010.01.24 Sunday ACHK

# Boss

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Change your boss if you cannot learn a lot from him.

— Me@2010.01.21

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2010.01.24 Sunday $copyright ACHK$

# Path integral formulation

This formulation has proved crucial to the subsequent development of theoretical physics, because it is manifestly symmetric between time and space.

Quantum field theory

The path integral formulation was very important for the development of quantum field theory. Both the Schrodinger and Heisenberg approaches to quantum mechanics single out time, and are not in the spirit of relativity.

— Wikipedia on Path integral formulation

2010.01.23 Saturday ACHK

# 地球 2

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When we remember we are all mad, the mysteries disappear and life stands explained.

— Mark Twain

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— Me@2010.01.22

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2010.01.23 Saturday $copyright ACHK$

# 電影與現實 3

（哪這些情節，你想用來反映現實世界的什麼呢？）

— Me@2010.01.22

# 電影與現實 2

— Me@2010.01.22, 改篇自莎士比亞

— Me@2010.01.21

# Desktop publishing

He came up with the idea of getting the three companies—Apple, Aldus, and Adobe—together to put together a marketing campaign called “desktop publishing.”

— Charles Geschke, Cofounder, Adobe Systems

— Founders at Work

2010.01.22 Friday ACHK

# 直播

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— 網友評價, 電影《真人Show》（The Truman Show）

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2010.01.22 Friday $ACHK$

# Category theory as a rival

Category theory is a unifying theory of mathematics that was initially developed in the second half of the 20th century. In this respect it is an alternative and complement to set theory. A key theme from the “categorical” point of view is that mathematics requires not only certain kinds of objects (Lie groups, Banach spaces, etc.) but also mappings between them that preserve their structure.

In particular, this clarifies exactly what it means for mathematical objects to be considered to be the same.

— Wikipedia on Unifying theories in mathematics

2010.01.11 Thursday ACHK

# The least of all evils 4

”眾害取其輕”(the least of all evils)這個表達式對我思考(intellectual mind)有很大啟發：有些時候，”邪惡”是必須的，唯有接受。但是 ”接受” 不代表 ”坐以待斃”。反而，我們應努力把邪惡減到最低，即是”眾害取最輕”。

（安：你的重點是，雖然建議要眾害中取最輕(Choose the least of all evils)，但是不能以此為作惡的借口，因為有些時候，evil毋須存在。）

— Me@2010.01.20