# Spectral decomposition function [closed]

Once I met a notation of "spectral decomposition function" (for a self-adjoint operator). No definition was given. Could someone give me a clue what can that be, cause I can't find this exact phrase anywhere. Thank you!

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Context would help here. Where was it? –  András Bátkai May 26 '13 at 17:49
University professor's lectures on operator algebras. –  Usmi May 26 '13 at 18:01
As you see from Robert Israels guesses, it is still unclear. Why don't you ask the professor? –  András Bátkai May 27 '13 at 7:24