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A puzzle in logic in which one or more facts must be inferred from a set of given facts.

A three-dimensional data set consisting of stacked two-dimensional data slices as a function of a third coordinate.

Let |sum_(n=1)^pa_n|<K, (1) where K is independent of p. Then if f_n>=f_(n+1)>0 and lim_(n->infty)f_n=0, (2) it follows that sum_(n=1)^inftya_nf_n (3) converges.

An area-preserving affine transformation. Equiaffinities include the crossed hyperbolic rotation, elliptic rotation, hyperbolic rotation, and parabolic rotation.

A Horn clause without a positive literal.

A polynomial x^n+a_(n-1)x^(n-1)+...+a_1x+a_0 in which the coefficient of the highest order term is 1.

One out of a set of identical observations in a given experiment under identical conditions.

A shift in phase.

A quantity which transforms like a tensor except for a scalar factor of a Jacobian.

A transformation of period 2.