This is a preview. Log in through your library . Abstract Orthonormal systems in commutative L2 spaces can be used to classify Banach spaces. When the system is complete and satisfies a certain norm ...

Lock a dog in a closet for three days and, when you let him out, he's overjoyed to see you. He's overjoyed not because you let him out, but just because you're there. A dog has no sense of time. He ...