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

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.)

One out of a set of identical observations in a given experiment under identical conditions.

The residual is the sum of deviations from a best-fit curve of arbitrary form. R=sum[y_i-f(x_i,a_1,...,a_n)]^2. The residual should not be confused with the correlation ...

A shift in phase.

The Reye graph is the transposition graph G_4 of order 4.

An (n-2)-dimensional face of an n-dimensional polytope.