| , Pair-dense relation algebras, Transactions of the American Mathematical Society (to appear). |
....are not satisfiable ( A83] Ma89] The hypothesis that A is finite cannot be omitted. There are some infinite representable relation algebras for which Theorem 5 is false ( Ly50] Ma78] Closed atomic networks are used for various other algebraic purposes in [Ma78] Ma82] Ma85] Ma89] and [Ma89a]. The closure of a network is a reduction which can be found in polynomial time. Finding an atomic reduction can be NP hard for some relation algebras. Sometimes atomic networks are always satisfiable, so the problem of determining constraint satisfiability reduces to finding an atomic reduction. ....
, Pair-dense relation algebras, Transactions of the American Mathematical Society (to appear).
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