00368nam a22001337a 450000500170000002000180001710000190003524500740005425000130012826000390014130000080018065000220018865000240021020260108120159.0  a9780486817330  aHalmos, Paul R  aIntroduction to hilbert space and the theory of spectral multiplicity  a2nd ed.   aNew YorkbDover publicationsc2022  a114  aSpectral measures  aHermitian operators