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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.

A grouping of statistics.

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

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

Any bivariate distribution function with marginal distribution functions F and G satisfies max{F(x)+G(y)-1,0}<=H(x,y)<=min{F(x),G(y)}.

The decimal expansion of the Golomb-Dickman constant is given by lambda=0.6243299885... (OEIS A084945). Mitchell (1968) computed lambda to 53 decimal places. lambda has been ...

A polynomial with real positive coefficients and roots which are either negative or pairwise conjugate with negative real parts.

A divisor which is not a proper divisor.

Two objects which touch each other are said to be incident.

A square matrix which is not reducible is said to be irreducible.