Mathematical Sciences Classification System
34Bxx - Boundary value problems 
{For ordinary differential operators, see  34Lxx}
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                            34B05Linear boundary value problems
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                            34B07Linear boundary value problems with nonlinear dependence on the spectral parameter
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                            34B08Parameter dependent boundary value problems
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                            34B09Boundary eigenvalue problems
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                            34B10Nonlocal and multipoint boundary value problems
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                            34B15Nonlinear boundary value problems
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                            34B16Singular nonlinear boundary value problems
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                            34B18Positive solutions of nonlinear boundary value problems
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                            34B20Weyl theory and its generalizations
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                            34B24Sturm-Liouville theory [See also 34Lxx]
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                            34B27Green functions
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                            34B30Special equations (Mathieu, Hill, Bessel, etc.)
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                            34B37Boundary value problems with impulses
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                            34B40Boundary value problems on infinite intervals
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                            34B45Boundary value problems on graphs and networks
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                            34B60Applications
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                            34B99None of the above, but in this section