行列(1s

何謂行列？在日文中他可能指隊伍或矩陣[1]，在中文裡也可能是「行列式」的行列。我敢打賭在座的各位絕對沒想到另一種輸入法——行列輸入法。

常態分佈 Normal Distribution

常態分佈很常出現在媒體上（其實沒有那麼常見），但他到底是什麼？為什麼他就這麼剛好是常態？

機率質量函數和機率密度函數 Probability Mass Function and Probability Density Function

機率可不全然只是做幾次排列組合......高中教材（或說學測）會讓你有這種錯覺。數學家在一番努力之後總算把機率弄到座標上了。

Dejection 是大學的單字、rejection 卻是高中的單字

Rejected by his beloved, he falls into dejection...

大部份人應該對 reject 這個單字不陌生，那 deject 呢？他們和 abject、object、project 和 subject 同樣都出於拉丁文的 iacio （投擲），但是我們對 deject 甚至 abject 的認知不如 reject 來的好，我們也可能不知道 subject 也可以當做子民或使屈服等等其他意思。問題出在哪裡？

A quick post about the direction of current

Without a second thought we might say that the current heads to somewhere, from one component to another. But is it true that any current does have an orientation?

A quick post about the voltage drop across a motor.

When we are dealing with some exercises on a physics textbook, sometimes we could run into a question with a motor. Under most circumstances, we would be asked to calculate the power of the motor with only a few conditions provided. According to the formula you can't be more famaliar with, the power could be easily yielded with P = IV applied. But why is not V zero if we assume the resistance of any piece of wire to be 0?