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View search results from all Wolfram sites (37394 matches)A level set in three dimensions.
A group G is said to act on a set X when there is a map phi:G×X->X such that the following conditions hold for all elements x in X. 1. phi(e,x)=x where e is the identity ...
A point which is a member of the set closure of a given set S and the set closure of its complement set. If A is a subset of R^n, then a point x in R^n is a boundary point of ...
A definition of a set by mentioning a defining property.
A set in a Polish space is a Borel set iff it is both analytic and coanalytic. For subsets of w, a set is delta_1^1 iff it is "hyperarithmetic."
The set theory symbol (aleph) for the cardinal number of a well-orderable infinite set.
A partially ordered set P is a circle order if it is isomorphic to a set of disks ordered by containment.
A function f:A->B such that B is a set of numbers.
A set of four, also called a quartet.
A set with three elements.
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