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I'm beginning to learn QM, and I've never seen any treatment of vector spaces with infinite bases. Countable case is quite digestible, but uncountable just flies over my head.

Can anyone recommend me place where to learn this more advanced part of linear algebra, with focus on stuff needed for QM? I already know a lot of finite-dimensional linear algebra algebra, but I can't find anything that would skip this and go into this more intermediate-level stuff directly.