云算法之对数‘3 raised to what will give us 81?‘

今天看完了算法第三集，教授提到的对数再复习一下

1.定义：x is the logarithm of n to the base b if bx = n, in which case one writes x = logb n.

2.logx 和lnx:以10为底；以e为底

3.计算

 

“Young man, in mathematics you don't understand things. You just get used to them.” ― John von Neumann

顺便看了看“Why PI is not 4”，涉及到微积分：

最后看了看Pascal三角形，想用python实现一下，还没想出怎么实现。