MathDB
Miklos Schweitzer 1975_10

Source: idempotent linear operator of a Hilbert space (an easy one, I think)

December 30, 2008
Functional Analysislinear algebralinear algebra unsolved

Problem Statement

Prove that an idempotent linear operator of a Hilbert space is self-adjoint if and only if it has norm 0 0 or 1 1. J. Szucs