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A series s_1,s_2,... for which s_1>=s_2>=....

If q is logically deducible from p, this is written p|-q.

A matrix whose eigenvectors are not complete.

An analytic, Borel, or coanalytic set.

If A and B are equal by definition (i.e., A is defined as B), then this is written symbolically as A=B, A:=B, or sometimes A≜B.

The property of being degenerate.

One of the three 2-polyaboloes.

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 cryptarithmetic in which digits are used to represent other digits.