06A07 11E04 3 Tits quadratic form 3 minimax equivalence 3 0-isomorphism 2 20M18 2 Möbius category 2 Möbius function 2 P-critical poset 2 combinatorial inverse semigroup 2 group congruence 2 minimax system of generators 2 poset 2 positive poset 2 05C25 1 05C50 1 15A63 1 68R10 1 Dynkin diagram 1 \(P\)-critical poset 1 almost positive poset 1 combinatorial algorithm 1 connectivity 1 diameter 1 girth 1 inclusion ideal graph 1 mesh geometry of roots 1 minimax \(d\)-system of generators 1 principal poset 1 quadratic form 1