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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.

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 determinant appearing in Padé approximant identities: C_(r/s)=|a_(r-s+1) a_(r-s+2) ... a_r; | | ... |; a_r a_(r+1) ... a_(r+s-1)|.

A definable set which is the complement of an analytic set.

A ring is commutative if the multiplication operation is commutative.

All lengths can be expressed as real numbers.

A type I Markov move.

An analytic, Borel, or coanalytic set.

For a finite group of h elements with an n_ith dimensional ith irreducible representation, sum_(i)n_i^2=h.

A simple graph with n>=3 graph vertices in which each graph vertex has vertex degree >=n/2 has a Hamiltonian cycle.