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A set A of integers is recursively isomorphic to set B if there is a bijective recursive function f such that f(A)=B.

The fractal J(-3/4,0), where J is the Julia set. It slightly resembles the Mandelbrot set.

A Julia set with c=-0.390541-0.586788i. The fractal somewhat resembles the better known Mandelbrot set.

The happy end problem, also called the "happy ending problem," is the problem of determining for n>=3 the smallest number of points g(n) in general position in the plane ...

The ideal generated by a set in a vector space.

A set equipped with a sigma-algebra of subsets.

A point which is a member of the set closure of a given set S and the set closure of its complement set. If A is a subset of R^n, then a point x in R^n is a boundary point of ...

A set of statistical distributions having the same variance.

A definition of a set by mentioning a defining property.

A generalization of the concept of set unions and intersections.