Mathematical Sciences Classification System
03Fxx - Proof theory and constructive mathematics
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                            03F03Proof theory, general
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                            03F05Cut-elimination and normal-form theorems
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                            03F07Structure of proofs
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                            03F10Functionals in proof theory
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                            03F15Recursive ordinals and ordinal notations
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                            03F20Complexity of proofs
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                            03F25Relative consistency and interpretations
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                            03F30First-order arithmetic and fragments
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                            03F35Second- and higher-order arithmetic and fragments [See also 03B30]
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                            03F40Gödel numberings and issues of incompleteness
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                            03F45
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                            03F50Metamathematics of constructive systems
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                            03F52Linear logic and other substructural logics [See also 03B47]
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                            03F55Intuitionistic mathematics
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                            03F60
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                            03F65Other constructive mathematics [See also 03D45]
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                            03F99None of the above, but in this section