【問題】= =問題:

[pianonrock 10]

H, K are Hilbert Spaces, {ui}⊂H, {vi}⊂K, are subsets and whose spans are dense in H, K, and <ui,uj>=<vi,,>vj, for all i, j. show that there is a unitary isomorphism U:H--->K,

such that Uui=vi, ∀i.

謝謝喔, 可以討論討論.