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A mathematical statement of the equivalence of two quantities. The equality "A is equal to B" is written A=B.

An equilibrium point in game theory is a set of strategies {x^^_1,...,x^^_n} such that the ith payoff function K_i(x) is larger or equal for any other ith strategy, i.e., ...

The difference between a quantity and its estimated or measured quantity.

Let g(x)=(1-x^2)(1-k^2x^2). Then int_0^a(dx)/(sqrt(g(x)))+int_0^b(dx)/(sqrt(g(x)))=int_0^c(dx)/(sqrt(g(x))), where c=(bsqrt(g(a))+asqrt(g(b)))/(sqrt(1-k^2a^2b^2)).

An orthogonal projection of a cross onto a three-dimensional subspace. It is said to be normalized if the cross vectors are all of unit length.

One of the Eilenberg-Steenrod axioms which states that, if X is a space with subspaces A and U such that the set closure of A is contained in the interior of U, then the ...

The exists quantifier exists .

For c<1, x^c<1+c(x-1). For c>1, x^c>1+c(x-1).

Given a subspace A of a space X and a map from A to a space Y, is it possible to extend that map to a map from X to Y?

That portion of a region lying "outside" a specified boundary.