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A reflexive relation.

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

A parameterization of a surface x(u,v) in u and v is regular if the tangent vectors (partialx)/(partialu) and (partialx)/(partialv) are always linearly independent.

Let there be two particularly well-behaved functions F(x) and p_tau(x). If the limit lim_(tau->0)int_(-infty)^inftyp_tau(x)F(x)dx exists, then p_tau(x) is a regular sequence ...

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

The least positive integer m^* with the property that chi(y)=1 whenever y=1 (mod m^*) and (y,m)=1.

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.

Euclidean n-space is denoted R^n.