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A function defined for all possible input values.

B_(p+k)=B_k+B_(k+1) (mod p), when p is prime and B_n is a Bell number.

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.

"The" octahedral graph is the 6-node 12-edge Platonic graph having the connectivity of the octahedron. It is isomorphic to the circulant graph Ci_6(1,2), the cocktail party ...