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An icositetrahedron is a 24-faced polyhedron. Examples include the deltoidal icositetrahedron, pentagonal icositetrahedron, small triakis octahedron, and tetrakis hexahedron.

A disjunction that remains true if either or both of its arguments are true. This is equivalent to the OR connective. By contrast, the exclusive disjunction is true if only ...

One of the basic objects treated in a given formal language system. The term is sometimes also used as a synonym for urelement.

The inner Vecten circle is the circumcircle of the inner Vecten triangle. It has center at Kimberling center X_(642), which is the complement of the inner Vecten point ...

The symbol int used to denote an integral intf(x)dx. The symbol was invented by Leibniz and chosen to be a stylized script "S" to stand for "summation."

Three concurrent homologous lines pass respectively through three fixed points on the similitude circle which are known as the invariable points.

The use of three prior points in a root-finding algorithm to estimate the zero crossing.

n divides a^n-a for all integers a iff n is squarefree and (p-1)|(n-1) for all prime divisors p of n. Carmichael numbers satisfy this criterion.

A lattice embedding is a one-to-one lattice homomorphism.

The length is the longest dimension of an object.