Gy. R. Szász

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Let G, = (X, , E,) and G, = (X,, E,) be two simple graphs. Their Cartesian product is the graph which has the cartesian product X, x X, as the vertex set, and vertices (x,, x2) and (y, ,y2) are joined if ((xl, y,) E E, and x2 = y2) or (x1 = y, and (x2, yZ) E E,). The lexicographic product G, @ G, has the same vertex-set and the vertices (x,, x2) and (y,,(More)
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