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A set U has compact closure if its set closure is compact. Typically, compact closure is equivalent to the condition that U is bounded.

The formal term in propositional calculus for the connective implies.

The acceleration of an element of fluid, given by the convective derivative of the velocity v, (Dv)/(Dt)=(partialv)/(partialt)+v·del v, where del is the gradient operator.

The Coxeter configuration is a 12_3 configuration whose Levi graph is the Nauru graph.

A cumulative product is a sequence of partial products of a given sequence. For example, the cumulative products of the sequence {a,b,c,...}, are a, ab, abc, .... Cumulative ...

Let A be an edge cut of a connected graph G. Then the cyclic edge connectivity lambda_c(G) is the size of a smallest cyclic edge cut, i.e., a smallest edge cut A such that ...

An algebraic surface which can be represented implicitly by a polynomial of degree 10 in x, y, and z. An example is the Barth decic.

A rewriting of a given quantity (e.g., a matrix) in terms of a combination of "simpler" quantities.

The study of definable sets and functions in polish spaces.

A divergenceless vector field, also called a solenoidal field, is a vector field for which del ·F=0. Therefore, there exists a G such that F=del xG. Furthermore, F can be ...