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Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.

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Higman's lemma and well-quasi-ordering theory [closed]

Higman's Lemma is basic to well-quasi-ordering (WQO) theory, but has many specific forms, for example: the Cartesian product of two WQOs is a WQO. Any new extensions? Usually proved by minimal bad seq …
michael fellows's user avatar