Not the most explanatory sources but function spaces essentially are vector spaces: https://en.wikipedia.org/wiki/Vector_space#Function_spaces https://en.wikip

Not the most explanatory sources but function spaces essentially are vector spaces: https://en.wikipedia.org/wiki/Vector_space#Function_spaces https://en.wikipedia.org/wiki/Vector_space#Function_spaces http://mathworld.wolfram.com/HilbertSpace.html http://mathworld.wolfram.com/HilbertSpace.html