Inner product spaces and their generalizations, Hilbert spaces, multipliers on Sobolev spaces, Kucera space, Sobolev spaces and other spaces of ``smooth'' functions, embedding theorems, trace theorems, multiplication functions, Spaces of measurable functions (\(L^p\)-spaces, Orlicz spaces, Köthe function spaces, Lorentz spaces, rearrangement invariant spaces, ideal spaces, etc.)