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An "area" which can be defined for every set--even those without a true geometric area--which is rigid and finitely additive.

Among the continuous functions on R^n, the positive definite functions are those functions which are the Fourier transforms of nonnegative Borel measures.

If O_(p^')(G)=1 and if x is a p-element of G, then L_(p^')(C_G(x))<=E(C_G(x)), where L_(p^') is the p-layer.

A surface which has no edges.

All lengths can be expressed as real numbers.

A complex polynomial is a polynomial with complex coefficients.

An immediate consequence of a result already proved. Corollaries usually state more complicated theorems in a language simpler to use and apply.

If lim_(k->infty)u_k!=0, then the series {u_n} diverges.

A mathematical statement of the equivalence of two quantities. The equality "A is equal to B" is written A=B.

A point, such as interior points of a disk, such that (px)(py)=[const], where p is the chord length.