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A heptomino in the shape of the Greek character pi.

alpha is called a predecessor if there is no ordinal number beta such that beta+1=alpha.

An operator in logic which returns either true or false.

A set class which is not a set.

A superset which is not the entire set.

A ruled semicircle used for measuring and drawing angles.

5((x^5)_infty^5)/((x)_infty^6)=sum_(m=0)^inftyP(5m+4)x^m, where (x)_infty is a q-Pochhammer symbol and P(n) is the partition function P.

A refinement X of a cover Y is a cover such that every element x in X is a subset of an element y in Y.

A relation R on a set S is reflexive provided that xRx for every x in S.

A reflexive relation.