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A measure that takes on real values.

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.

In the plane, the reflection property can be stated as three theorems (Ogilvy 1990, pp. 73-77): 1. The locus of the center of a variable circle, tangent to a fixed circle and ...

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).

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 ...