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One of the Eilenberg-Steenrod axioms which states that, if X is a space with subspaces A and U such that the set closure of A is contained in the interior of U, then the ...

The exists quantifier exists .

For c<1, x^c<1+c(x-1). For c>1, x^c>1+c(x-1).

Given a subspace A of a space X and a map from A to a space Y, is it possible to extend that map to a map from X to Y?

The radius of the smallest circle centered at one of the points of an N-cluster, which contains all the points in the N-cluster.

That portion of a region lying "outside" a specified boundary.

A field of extremals is a plane region which is simply connected by a one-parameter family of extremals. The concept was invented by Weierstrass.

The ratio of two independent estimates of the variance of a normal distribution.

A grouping of statistics.

nu_((r))=sum_(x)x^((r))f(x), where x^((r))=x(x-1)...(x-r+1).