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A module taking its coefficients in a ring R is called a module over R or R-module.

The point with respect to which a radial curve is computed.

The vector r from the origin to the current position. It is also called the position vector. The derivative of r satisfies ...

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 type of binary tree.

A measure that takes on real values.

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

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.