nonattacking
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nonattacking — adj. * * * … Universalium
nonattacking — adj … Useful english dictionary
Topological graph theory — In mathematics topological graph theory is a branch of graph theory. It studies the embedding of graphs in surfaces, and graphs as topological spaces. [J.L. Gross and T.W. Tucker, Topological graph theory, Wiley Interscience, 1987] Embedding a… … Wikipedia
1987 (number) — 1987 is the natural number following 1986 and preceding 1988.In mathematics1987 is an odd number and the 300th prime number. It starts the sexy prime triplet (1987, 1993, 1999). Being of the form 4 n + 3, it is a Gaussian prime. It is a lucky… … Wikipedia
chess — chess1 /ches/, n. a game played by two persons, each with 16 pieces, on a chessboard. [1150 1200; ME < OF esches, pl. of eschec CHECK1] chess2 /ches/, n., pl. chess, chesses. one of the planks forming the roadway of a floating bridge. [1425 75;… … Universalium
