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The set difference A\B is defined by A\B={x:x in A and x not in B}. Here, the backslash symbol is defined as Unicode U+2216. The set difference is therefore equivalent to the ...

A structure consisting of an ordered set of sorted lists such that the head and tail entries of later lists nest within earlier ones. For example, an encroaching list set for ...

A set of plane measure 0 that contains a circle of every radius.

In a complete metric space, a countable union of nowhere dense sets is said to be meager; the complement of such a set is a residual set.

The index set for the collection of submodules in a graded module.

The continuous image of a Polish space, also called an analytic set.

A set S in a vector space over R is called a convex set if the line segment joining any pair of points of S lies entirely in S.

A group set is a set whose elements are acted on by a group. If the group G acts on the set S, then S is called a G-set. Let G be a group and let S be a G-set. Then for every ...

A set function is a function whose domain is a collection of sets. In many instances in real analysis, a set function is a function which associates an affinely extended real ...

An algebraic set is the locus of zeros of a collection of polynomials. For example, the circle is the set of zeros of x^2+y^2-1 and the point at (0,0) is the set of zeros of ...