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A square prism is prism with square base and is therefore a special case of a cuboid.

The p-adic norm satisfies |x+y|_p<=max(|x|_p,|y|_p) for all x and y.

A sum-free set S is a set for which the intersection of S and the sumset S+S is empty. For example, the sum-free sets of {1,2,3} are emptyset, {1}, {2}, {3}, {1,3}, and ...

The set closure of the set of arguments of a function f for which f is not zero.

Possessing a three equivalent modes.

The twin primes constant Pi_2 (sometimes also denoted C_2) is defined by Pi_2 = product_(p>2; p prime)[1-1/((p-1)^2)] (1) = product_(p>2; p prime)(p(p-2))/((p-1)^2) (2) = ...

The Reidemeister move of type I.

The property of being the only possible solution (perhaps modulo a constant, class of transformation, etc.).

A polynomial in a single variable, e.g., P(x)=a_2x^2+a_1x+a_0, as opposed to a multivariate polynomial.

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