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A type of binary tree.

The words random and stochastic are synonymous.

A quadratic field Q(sqrt(D)) with D>0.

A matrix for which horizontal and vertical dimensions are not the same (i.e., an m×n matrix with m!=n).

The Ree group R(q) is the automorphism group of a S(2,q+1,q^3+1) Steiner system.

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.

An open connected set is called a region (sometimes also called a domain).

The locus of lines meeting three given skew lines. ("Regulus" is also the name of the brightest star in the constellation Leo.)