49Rxx Variational methods, {For eigenvalues of operators, See 47A75} ( 0 Dok. )

• 49R05 Variational approach to eigenvalues ( 0 Dok. )
• 49R10 Rayleigh-Ritz methods ( 0 Dok. )
• 49R15 Weinstein and Aronszajn methods, intermediate problems ( 0 Dok. )
• 49R20 Linear operators in Hilbert spaces ( 0 Dok. )
• 49R99 None of the above but in this section ( 0 Dok. )