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An orthogonal projection of a cross onto a three-dimensional subspace. It is said to be normalized if the cross vectors are all of unit length.

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).

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.

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).

The point of coincidence of P and P^' in Fagnano's theorem.

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