Math, Better Explained

I wish I had read this book in college.

这个数学学习心得网站值得分享，非常通透地理解和讲解数学概念，让数学变得有趣

非常值得一读！

妙不可言。

Heuristics

八千万颗星星！！！强烈建议取消（由于满足数乘交换律就）把两个因数作为同等地位看待。除了颜色距离那一趴，RGB色系不是线性的，可以用曼塞尔色系（不过举例是黑白灰也不太影响）。

many years ago , a student asked me why -1*-1=1 , I never had a good answer for it. now I know, think in direction/rotations , not length! ln.e it is about time and growth ! Exponential imaginary growth traces out a circle! HAPPY MATH!

没有想象中好