I am writing a paper in math. In that paper, I need to quote several theorems/propositions from a classic textbook on the subject. All of them are quite standard results, but I am not sure what are the original sources for those. The book didn't say that either (unless it's a quite famous theorem, then it would have a name attached to it). How do I properly refer to that? I heard that if I don't put a name next to it, people will think I am claiming it, which I am not.
I'm not sure how things are done in math, but if these theorems are "quite standard" and common knowledge, I would think you could mention them, and say something along the lines of "for a reference" or "for further discussion" see XYZ textbook