Isn't that cool? It's common to package these coordinates into a two by two grid of numbers called a two by two matrix, where you can interpret the columns as the two special vectors where I had and j hat each land.

这不是很酷吗 通常把这些坐标打包成一个2×2的网格 叫做2×2矩阵 你可以把这些列解释为两个特殊的向量 每个向量都是j帽。