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

A sequence produced by the instructions "reverse, add to the original, then sort the digits." For example, after 668, the next iteration is given by 668+866=1534, so the next ...

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

The point of illumination for a caustic.

The quantity under a radical sign.

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.

The words random and stochastic are synonymous.

The rascal triangle is a number triangle with numbers arranged in staggered rows such that a_(n,r)=n(r-n)+1. (1) The published study of this triangle seems to have originated ...

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