Mathematical Sciences Classification System
06Axx - Ordered sets
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                            06A05Total order
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                            06A06Partial order, general
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                            06A07Combinatorics of partially ordered sets
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                            06A11Algebraic aspects of posets
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                            06A12
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                            06A15Galois correspondences, closure operators
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                            06A75Generalizations of ordered sets
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                            06A99None of the above, but in this section