49Rxx Variational methods
{For eigenvalues of operators, see 47A75}
- 49R05 Variational approach to eigenvalues
- 49R10 Rayleigh-Ritz methods
- 49R15 Weinstein and Aronszajn methods, intermediate problems
- 49R20 Linear operators in Hilbert spaces
- 49R99 None of the above, but in this section
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