Math formal language is expressive enough to express everything most mathematicians want. The thing is that formal math language wasn't designed as a medium to

Math formal language is expressive enough to express everything most mathematicians want. The thing is that formal math language wasn't designed as a medium to transfer ideas, but rather as a notation to write them down concisely and make things easy to manipulate. That's why learning from books that are very formal is such a difficult experience, though it gets easier with experience. Unfortunately, to get to that level of experience, you pretty much have to be focused on pure mathematics for years, and if you're just trying to learn some math to get some other shit done, and there isn't any book written in more conversational style (which thankfully usually is the case), you're out of luck.