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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).

A tree spread in which each node has a finite number of children.

The three diagonal points of a complete quadrilateral are never collinear.

A fiber space, depending on context, means either a fiber bundle or a fibration.

The order of a finite field is the number of elements it contains.

The geometry of Finsler space.

A topological space in which every point has a countable neighborhood system base for its neighborhood system.