Definition A Hilbert space H is a real or complex inner product space that is also a complete metric space with respect to the distance function induced by the inner product.[2] To say that H is a complex inner product space means that H is a complex…
http://mathworld.wolfram.com/HilbertSpace.html A Hilbert space is a vector space with an inner product such that the norm defined by turns into a complete metric space. If the metric defined by the norm is not complete, then is instead known as a…
\(\underline{Def:}\)A topology space \(\mathcal{X}=(\underline{X},\eth_{x})\)consists of a set \(\underline{X}\),called the underlying space of \(\mathcal{X}\) ,and a family \(\eth_{x}\)of subsets of \(\mathcal{X}\)(ie.\(\eth_{x}\subset P(\underline{…