New posts in Spectral Theory

Conditions for positive definiteness: matrix inequality

Hermitian Operators and the Spectral Theorem

Norm of the product of a self-adjoint operator and one of its spectral projections

Do two matrices close in spectral norm have close traces?

Proof of Spectral Theorem

Eigenvalues and Spectrum

Essential Selfadjointness of Quantum Harmonic Oscillator Hamiltonian

Resolvent: Definition

Spectrum of idempotent element

Spectrum of shift-operator