Hamiltonian, Linear subspace, Cauchy-Schwarz inequality, Cholesky decomposition, Hilbert space, Spectral theory of ordinary differential equations, Von Neumann ... » 

Hamiltonian, Linear subspace, Cauchy-Schwarz inequality, Cholesky decomposition, Hilbert space, Spectral theory of ordinary differential equations, Von Neumann algebra, Hardy space, Self-adjoint operator, Compact operator on Hilbert space «