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Let L=(L, ^ , v ) be a lattice, and let f,g:L->L. Then the pair (f,g) is a local polarity if and only if for each finite set X subset= L, there is a finitely generated ...

O_h is the point group of symmetries of the octahedron having order 48 that includes inversion. It is also the symmetry group of the cube, cuboctahedron, and truncated ...

The Risch algorithm is a decision procedure for indefinite integration that determines whether a given integral is elementary, and if so, returns a closed-form result for the ...

There are two definitions of the supersingular primes: one group-theoretic, and the other number-theoretic. Group-theoretically, let Gamma_0(N) be the modular group Gamma0, ...

Roman (1984, p. 2) describes umbral calculus as the study of the class of Sheffer sequences. Umbral calculus provides a formalism for the systematic derivation and ...

A group in which any decreasing chain of distinct subgroups terminates after a finite number.

The group of classes of finite dimensional central simple algebras over k with respect to a certain equivalence.

A variable which belongs to exactly one of a finite number of categories.

The difference of two numbers n_1 and n_2 is n_1-n_2, where the minus sign denotes subtraction.

A tree spread in which each node has a finite number of children.