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

A set of statistical distributions having different variances.

The manipulation of Dehn surgery descriptions by a certain set of operations.

An attracting set to which orbits or trajectories converge and upon which trajectories are periodic.

The Minkowski measure of a bounded, closed set is the same as its Lebesgue measure.

Let S be a subset of a metric space. Then the set S is open if every point in S has a neighborhood lying in the set. An open set of radius r and center x_0 is the set of all ...

The notation R^_ denotes the set of affinely extended real numbers.

"The rationals" refers to the set of rational numbers and is commonly denoted Q.

An open connected set is called a region (sometimes also called a domain).

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 ...