Naimark's Dilation Theorem: Operator Theory, Stinespring Factorization Theorem, Projection Valued Measure

Atkinson's Theorem: Operator Theory, Fredholm Operator, Compact

Factorization: Factorization, Mathematics, Multiplication, Fundamental Theorem of Arithmetic

Wigner Eckart Theorem: Theorem, Representation Theory, Quantum Mechanics, Matrix Element, Operator, Angular Momentum

Von Neumann's Theorem: Mathematics, Operator Theory, Linear Operator, Hilbert Space