# Quod Erat Demonstrandum

……

## 2009/08/30

### Finding general term by generating function

It is extremely easy to set up questions on number pattern, like

1, 3, 8, 19, 42, 89, ?

for more details, we may tabulate the question as:

the question is, when $n = 6$, what is the value of $a_n$?

My first reply to such kind of question is

“no need to do" (more…)

## 2009/08/27

### [FW] 給樂道中學同學的一封信

Filed under: Report — johnmayhk @ 4:06 下午
Tags:

http://www.oscar.idv.hk/blessing/farewell.pdf

http://www.oscar.idv.hk

## 2009/08/23

### 等闊曲線 2

Filed under: HKCEE,mathematics — johnmayhk @ 12:28 下午
Tags: ,

「每一個角對面對應著一個圓弧；同樣，每一個圓弧對面也對應著一個角」 – – – – – – (*)

## 2009/08/17

### [FW] GeoSketch

Filed under: Fun,mathematics — johnmayhk @ 12:41 上午
Tags:

A student, woody, had forwarded the following game to me:

http://www.kongregate.com/games/Denial_Designs/geosketch

By putting three different parameters, we may create fun geometric curves easily, just show you some:

20,-8,9

40,-20,13

30,20,100

Try to create your own, have fun! Well, it may be a kind of learning and teaching aids in the topic of LOCUS, let’s try it!

## 2009/08/15

### Think Before You Post

Filed under: Uncategorized — johnmayhk @ 12:17 上午

「上網時間多寡」與「對網上資訊的信任度」或許存在高於 0.5 的相關係數（亂吹的，有興趣者可繼續研究）。

……

## 2009/08/10

### 等闊曲線 1

Filed under: Fun,HKCEE,mathematics — johnmayhk @ 9:32 下午
Tags: ,

## 2009/08/06

### [FW] 請用法理來說服我 ──為許志永老師給溫家寶總理的公開信

Filed under: Life,Report — johnmayhk @ 8:05 下午
Tags:

(明報)2009年8月6日 星期四 05:05

### 開任意次方法

Filed under: Junior Form Mathematics — johnmayhk @ 6:31 下午
Tags:

《幾何與數理邏輯》湯璪真文集

## 2009/08/03

### 無限 2

Filed under: University Mathematics — johnmayhk @ 10:16 下午
Tags:

（標準的）實數域 $\mathbb{R}$ 中並不存在無限小，現代非標準分析創始人 A. Robinson 等利用超冪概念構作有序的非標準實數域，允許無窮小直接參加運算。