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A number x such that for all epsilon>0, there exists a member of the set y different from x such that |y-x|<epsilon. The topological definition of limit point P of A is that ...

A set in R^n which can be reduced to one of its points, say P, by a continuous deformation, is said to be contractible. The transformation is such that each point of the set ...

The portion of number theory concerned with expressing an integer as a sum of integers from some given set.

The backslash symbol \ is used to denote a set difference, quotient group, or integer division.

A portion of the Mandelbrot set centered around 0.3+0i with size approximately 0.1+0.1i.

The problem of finding all independent irreducible algebraic relations among any finite set of quantics.

Algebra

Given a set X, a set function mu^*:2^X->[0,infty] is said to be an outer measure provided that mu^*(emptyset)=0 and that mu^* is countably monotone, where emptyset is the ...

The upper irredundance number IR(G) of a graph G is the maximum size of an irredundant set of vertices in G. It is therefore equal to the size of a maximum irredundant set as ...

A Brunnian link is a set of n linked loops such that each proper sublink is trivial, so that the removal of any component leaves a set of trivial unlinked unknots. The ...