# Hole, 2

The existence of X is not a property of X itself. Instead, the existence of X is a property of the bigger system that consists of X.

For example, the existence of a hole is a property of the whole, not of the hole itself. You cannot define a hole without the whole. Without the whole, the hole cannot exist at all.

hole ~ whole

— Me@2012.10.26

# Constraints, 4

Constraints give you focus.

— Me@2011.01.02

# Physics Question (2013 DSE MCQ29)

For convenience, I assume that the rod OP is horizontal.

1. Remember, current (positive charges) moves from high potential to low potential outside a battery, but it moves from low potential to high potential inside the battery.

2. An induced emf is a kind of battery. That is why it is called “induced emf”, not “induced potential difference”.

3. Right Hand Rule:

Motion –> downwards

B-field –> into the paper

So

current –> O to P

Then, P is at a higher potential.

4. Left Hand Rule:

B-field –> into the paper

Therefore, you, as the positive charge, experience a force, pointing to the right. So the induced emf is pointing to the right.

Inside a battery, the direction of the emf is pointing from low potential to high potential. Thus, P is at a higher potential.

— Me@2014-03-19 01:54:04 PM

# Free Software 6

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

Free software does not have to be free. Free software does not even have to be cheap.

Free Software Foundation sold each Emacs floppy disk copy for 100 dollars.

— based on my memory of a Richard Stallman’s speech in Hong Kong

[The “\$100” may be incorrect. But spirit of the whole paragraph is intact.]

— Me@2013.07.17

R: We should use free software instead of proprietary software. My rule is: I will not use any programs that I cannot share with you.

Q: But sometimes proprietary software is more convenient than free software.

R: What if I want both freedom and convenience?

What can I do?

Either turn convenient software free or turn free software convenient. But turning convenient software free is impossible, because we don’t have the source code and the copyright law does not allow us to do so.

So all we should do is to turn free software convenient.

— based on my memory of a Richard Stallman’s speech in Hong Kong

— Me@2014.04.29

# 回到過去 3

Cumulative concept of time 20

（Me：那樣，如果我只是「回到過去」，但不「經歷過去」，我豈不是不會「失去青春」？）

— Me@2014-04-24 01:56:35 AM

# 心靈報章 1.1

（安：我份工作最困難的部分是，在大部分的時間，我會被迫去，和很多很愚蠢的人士去溝通。）

（安：但是，設計給我的對白，並不是「劇本」。大家也必定跟著講的，才算是「劇本」。我不能期望，在我講完一些設計對白後，同事必定以，我心目中的想像去回應。）

（安：但是，人類的愚蠢，實在會超乎你的想像。再多的「設計對白」，也未必能應付得到。

— Me@2014.04.25

# Fact

“Fact” is “事實” in Chinese. Literally,

fact

~ event solid

~ past event

~ unchangeable

Abstract facts, such as “2+2=4”, are definitions.

Analytic facts are definitions.

Synthetic facts are past events.

— Me@2012.10.26

# Information explosion

Story | 故事連線 5

“Point of view” is that quintessentially human solution to information overload, an intuitive process of reducing things to an essential relevant and manageable minimum.

– Paul Saffo

— Me@2008.10.18

# nCr, 4

（A: 那為什麼把「7P3」拆成「7P2 x 5P1」就可以？那不會「暗地裡加了次序」嗎？）

7 個蘋果中選 3 出來，即是相當於有 3 個格子要填滿：

（＿）（＿）（＿）

（7）（＿）（＿）

（7）（6）（＿）

（7）（6）（5）

3! = 6

（7）（6）（5）
—————-
（3!）

= 35

（＿）（＿）（＿）

（3）（＿）（＿）

（3）（2）（＿）

（3）（2）（1）

（7）（6）（5）
—————-
（3）（2）（1）

= 35

（7）（6）|（5）
——— ——-
（2）（1）|（1）

（7）（6）|（5）
= ——— ——
（2!） |（1!）

= 105

— Me@2014.04.21

# Dropbox, 6

In the end, it really came down to one incredibly genius idea: Dropbox limited its feature set on purpose. It had one folder and that folder always synced without any issues — it was magic. Syncplicity could sync every folder on your computer until you hit our quota. (Unfortunately, that feature was used to synchronize C:\Windows\ for dozens of users — doh!) Our company had too many features and this created confusion amongst our customer base. This in turn led to enough customer support issues that we couldn’t innovate on the product, we were too busy fixing things.

— Isaac Hall

2014.04.20 Sunday ACHK

chris_mahan 24 minutes ago | link

I don’t watch TV (at all) and I game maybe 4 hours a week, usually in 2 sittings.

(I will occasionally watch a DVD, but maybe 2 hours a month, max.)

When people give me grief that I play the games, I tell them I’m a software developer: it’s like a writer reading books.

— Hacker News

2014.04.20 Sunday ACHK

# 學派

（安：用李生的方法，先將最核心的東西寫出來。）

（安：那樣，自然有後人，發展那些核心東西的技術細節。漸漸地，甚至演變成一個學派。）

— Me@2014.04.17

# The fifth floor

The fifth floor cannot exist without the first 4 floors.

— Me@2012.10.24

That’s why time travel is logically impossible.

— Me@2014.04.17

If you remove the first 4 floors, the original fifth floor is not the “fifth” floor anymore. Instead, it would become the first floor.

— Me@2014.04.16

# nCr, 3

（A: 為何把「7P3」拆成「7P2 x 5P1」就可以，而把「7C3」拆成「7C2 x 5C1」就錯誤？）

ABE

AEB

BAE

BEA

EAB

EBA

ABE

AEB

BAE

BEA

EAB

EBA

AB　E

BA　E

AE　B

EA　B

BE　A

EB　A

AB　E

BA　E

AE　B

EA　B

BE　A

EB　A

（A: 那為什麼把「7P3」拆成「7P2 x 5P1」就可以？那不會「暗地裡加了次序」嗎？）

— Me@2014.04.14

# openSUSE

openSUSE is a general purpose operating system built on top of the Linux kernel, developed by the community-supported openSUSE Project and sponsored by SUSE and a number of other companies. After Novell acquired SUSE Linux in January 2004, Novell decided to release the SUSE Linux Professional product as a 100% open source project. In 2011 The Attachmate Group acquired Novell and split Novell and SUSE into two autonomous subsidiary companies. SUSE offers products and services around SUSE Linux Enterprise — their commercial offering that is based on openSUSE Linux.

— Wikipedia on openSUSE

2014.04.13 Sunday ACHK

“Why do people love me but hate you?”

Death responded,

“Because you are a beautiful lie and I am a painful truth.”

2014.04.12 Saturday ACHK

# 假名定律 1.2

Jesus, Buddha, Einstein 3.2

（安：經濟學家張五常先生提過，有一篇經濟論文指出，凱恩斯（John Maynard Keynes）的經濟理論，和「凱恩斯學派」的經濟理論，不盡相同，雖然整個學派是以「凱恩斯」來命名。）

Bayes himself might not have embraced the broad interpretation now called Bayesian. It is difficult to assess Bayes’s philosophical views on probability, since his essay does not go into questions of interpretation.

— Wikipedia on Thomas Bayes

— Me@2014.04.11

I like your Christ. I do not like your Christians. Your Christians are so unlike your Christ. The materialism of affluent Christian countries appears to contradict the claims of Jesus Christ that says it’s not possible to worship both Mammon and God at the same time.

– Mohandas K. Gandhi

# The Beginning of Time, 5

What’s going on after going through the singularity of a black hole?

~ What’s going on before the Big Bang?

The two questions have similar nature.

— Me@2012.10.23

# The smallest possible step, 5

Expecting to finish is expecting to control the future directly.

However, you cannot control the future directly.

You can control the future only through the now actions.

In other words, you cannot finish. Instead, you can get finishing only by keeping starting.

— Me@2010.12.19

— Me@2014.04.07