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An edge-magic graph is a labeled graph with e graph edges labeled with distinct elements {1,2,...,e} so that the sum of the graph edge labels at each graph vertex is the ...

A set considered together with the sigma-algebra on the set.

A surface given by the form z=F(x,y).

A polynomial x^n+a_(n-1)x^(n-1)+...+a_1x+a_0 in which the coefficient of the highest order term is 1.

The simplicial complex formed from a family of objects by taking sets that have nonempty intersections.

Approximates the possible values of y in terms of x if sum_(i,j=0)^na_(ij)x^iy^j=0.

A quantity which is either 0 (zero) or positive, i.e., >=0.

Sampling at the Nyquist frequency.

An 80-sided polygon.

A nonsingular linear map A:R^n->R^n is orientation-reversing if det(A)<0.