# Quod Erat Demonstrandum

## 2011/04/13

### 解微分方程

Filed under: Additional / Applied Mathematics,HKALE — johnmayhk @ 8:50 上午

[Hardsell 廣告腔] 解微分方程？用

http://www.wolframalpha.com/

y"+y=sin(x)

y"+y=sin(x)

y"‘+y=sin(x)

y"‘+y=sin(x)

## 4 則迴響 »

1. 最近睇番我在大學讀過的科目，微分方程原來係大學入面接觸過最多的範疇的數學。
有ODE，PDE和SDE。慶幸以前有讀app math…入左大學接觸這些東西都唔會太辛苦。

迴響 由 Justin — 2011/04/13 @ 2:35 下午 | 回應

• Stochastic Differential Equation（SDE）完全無接觸過。

學者認為，中學數學教的課題愈少愈好，留待大學才學，免得中學授課員教壞學生。

我也漸漸贊成「教的課題愈少愈好」，除了生怕我教錯學生成為千古罪人外，現在似乎比以前較難提升學生學習數學的興趣。遲些再談。

迴響 由 johnmayhk — 2011/04/13 @ 3:57 下午 | 回應

2. I have tried the followings on Alpha.Amazing!

(a) probability of 1 head 5 tails

(b) probability of 1 head 1999 tails

Indeed, there is an open-source program called “Sage". It works like the Matlab and Mathematica.

迴響 由 Matt — 2011/04/13 @ 3:02 下午 | 回應

• Thank you Matt!

It is good to know that we can find probabilities by Wolfram. May be I need to explore to see if it can solve more complicated problems. For “Sage", I should have to explore it earlier, but I am too lazy now.

迴響 由 johnmayhk — 2011/04/13 @ 4:00 下午 | 回應