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A transformation which has only trivial invariant subsets is said to be ergodic.

The difference between a quantity and its estimated or measured quantity.

The function f(beta,z)|->z^((1+cosbeta+isinbeta)/2), illustrated above for beta=0.4.

The two-dimensional Euclidean space denoted R^2.

An arbitrary rotation may be described by only three parameters.

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 .

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.