Math books be like this. Stared at this a long time before I realized it was just basically saying that the product of a matrix with its inverse is the identity. Lol why
Follow
@mandlebro It's all about expressing something in a very concise and efficient way. When you're actually using these formulea for something, you end up writing the same thing over and over again with slight tweaks here and there. Writing just a few letters, instead of a sentence, makes a big difference in efficiency.
