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A relation R on a set S is transitive provided that for all x, y and z in S such that xRy and yRz, we also have xRz.

One of the four 3-polyaboloes.

The unique 3-polyiamond, illustrated above.

Capable of taking on exactly one possible value.

A formula whose truth table contains only false in any interpretation is called unsatisfiable.

The symbol v variously means "disjunction" (i.e., OR in logic) or "join" (for a lattice).

A^n+B^n=sum_(j=0)^(|_n/2_|)(-1)^jn/(n-j)(n-j; j)(AB)^j(A+B)^(n-2j), where |_x_| is the floor function and (n; k) is a binomial coefficient.

A mathematical problem, usually not requiring advanced mathematics, to which a solution is desired. Puzzles frequently require the rearrangement of existing pieces (e.g., 15 ...

The skeleton of the bislit cube is the 8-vertex simple graph, illustrated above in several embeddings, which consists of a cube in which two opposite faces have polyhedron ...

The Doob graph D(m,n) is the graph given by the graph Cartesian product of m>=1 copies of the Shrikhande graph with a Hamming graph H(n,4). Doob graphs are distance-regular ...