Do You Know What You're Doing in a Problem?

In linear algebra, and basically mathe calcula in o calculus to basicall invilld wichan, visualize what you're doing in a problem. Do you remember the one problem where we had to prove that a set was closed, and the set was basically the ball intersection with a like this function? It was like the rule. And so at the visualization tes, if we're going, hais that queston, we're going very crazy, very insane. You know, it so important that what's so important is being able to visualize the equation for a circle and a sphere in three dimensions. I mean, because em thats just class notice."