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It is possible to describe a set of positive integers that cannot be listed in a book containing a set of counting numbers on each consecutively numbered page. Another form ...

If {a_0,a_1,...} is a recursive sequence, then the set of all k such that a_k=0 is the union of a finite (possibly empty) set and a finite number (possibly zero) of full ...

Let u^_ denote the mean of a set of quantities u_i, then the absolute deviation is defined by Deltau_i=|u_i-u^_|.

The portion of number theory concerned with expressing an integer as a sum of integers from some given set.

A set which transforms via converse functions. Antisets usually arise in the context of Chu spaces.

A logical system which possesses an explicitly stated set of axioms from which theorems can be derived.

The backslash symbol \ is used to denote a set difference, quotient group, or integer division.

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

Given a set of objects S, a binary relation is a subset of the Cartesian product S tensor S.

Consider a Boolean algebra of subsets b(A) generated by a set A, which is the set of subsets of A that can be obtained by means of a finite number of the set operations ...