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A metric g_(ij) which is zero for i!=j.

A diffeomorphism is a map between manifolds which is differentiable and has a differentiable inverse.

A polynomial form which is the sum of two polynomial forms involving separate sets of variables.

A distance-heredity graph, also known as a completely separable graph, is a graph G such that the distance matrix of every connected vertex-induced subgraph G_V of G is the ...

A divergent sequence is a sequence that is not convergent.

A 90-sided polygon.

A 19-sided polygon, sometimes also called the enneakaidecagon.

The exists quantifier exists .

A grouping of statistics.

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