摘要 : Any two infinite-dimensional (separable) Hilbert spaces are unitarily isomorphic. The sets of all teir self-adjoint operators are also therefore unitarily equivalent. Thus if all self-adjoint operators can be observed, and if ther... 展开 Any two infinite-dimensional (separable) Hilbert spaces are unitarily isomorphic. The sets of all teir self-adjoint operators are also therefore unitarily equivalent. Thus if all self-adjoint operators can be observed, and if there is no further major axiom in quantum physics than those formulated for example in Dirac's 'quantum mechanics', then a quantum physicist would not be able to tell a torus from a hole in the ground. 收起