Daily Archives: March 5, 2010

Past papers 4

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“Past papers” means “past HKCEE/HKAL examination papers”. The topic is for Hong Kong students who are facing HKCEE or HKAL. But the general principles can also be used for tackling other public examinations.

這個原理除了可以應用在溫習的時間管理外，也可以應用在考試時的時間管理上。例如，整份試卷共有五題。很多人做第一題時，往往會力臻完美：寫字慢慢地寫，字體很優美；錯了又要用塗改液塗，然後慢慢等它乾；答案過份詳細；有少部分不懂，又要堅持想不到不罷休 … … 那樣的話，通常其餘四題會不夠時間做。

question 1 20/20
question 2 15/20
question 3 10/20
question 4 10/20
question 5 05/20

total 60/100

正確的政策是，要根據題目的分數多少，來決定應花多少時間在每一題。例如，某一題的適當時限是半小時，大概在 25 分鐘的時候，你就應該準備收筆，趕快寫下最後一句，然後立刻問始做下一題。無論心裡有多麼不舒服，你一定要迫自己停筆，迫自己趕快開始下一題。寧願在所有題目都大概完成了後，還有剩餘時間的話，才回第一題，修正不完美的地方。即使沒有時間給你修正，導致不能取滿分，起碼所有題目都大概完成，保證你會有一個不低的分數。

question 1 15/20
question 2 15/20
question 3 15/20
question 4 15/20
question 5 15/20

total 75/100

— Me@2010.03.05

2010.03.05 Friday (c) All rights reserved by ACHK

Category Theory | Lisp

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My current self-study programme includes

1. read almost everything written by Paul Graham

public domain image
Wikipedia

2. learn Lisp programming language (Common Lisp/Scheme) by reading Paul Graham’s textbooks

3. learn Category Theory so that I can read almost everything written by John Baez

public domain image
Wikipedia

Yester-night and tonight, I discovered that they are related:

“Lists, and recursive operations on them, are an excellent case in point. But the path connecting them to their mathematical underpinnings is a long and winding one, which lays in the realm of Category Theory.” — jao

I had never expected that. They are one thing.

Paul Graham –> Lisp –> Category Theory –> John Baez

I have been learning Lisp since 2000 (Machine Intelligence course), since 2006 (Structure and Interpretation of Classical Mechanics, Structure and Interpretation of Computer Programs), since 2010. I have been learning Category Theory since 2006-2008 (John Baez), since 2008 (Sets for Mathematics), since 2010. I had never expected that they are just two different languages of the same thing.

— Me@2010.03.04

2010.03.05 Friday (c) All rights reserved by ACHK

Hacker ethic

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Hacker 4

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* Access to computers — and anything which might teach you something about the way the world works — should be unlimited and total. Always yield to the Hands-On Imperative!

* All information should be free.

* Mistrust authority — promote decentralization.

* Hackers should be judged by their hacking, not criteria such as degrees, age, race, sex, or position.

* You can create art and beauty on a computer.

* Computers can change your life for the better.

… free and open source software allows hackers to access the code used to create the software to improve or reuse it. In effect the free and open source software movements embody all of the hacker ethics.

— Wikipedia on Hacker ethic

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[10] Hacker here means a highly skilled programmer, not a computer criminal. — Me

The basic difference is this: hackers build things, crackers break them. — Eric S. Raymond

“In academia, a “hacker” is a person who follows a spirit of playful cleverness and enjoys programming.”

– Wikipedia on Hacker (academia)

2010.03.05 Friday  ACHK