most citedEach n-by-n matrix with n>1 is a sum of 5 coninvolutory matrices

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math.OA2016

Every bounded self-ajoint operator is a real linear combination of orthoprojections

V. Rabanovich

We prove that every bounded self-adjoint operator in Hilbert space is a real linear combination of orthoprojections. Also we show that operators of the form identity minus comp…