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A 100-sided polygon, virtually indistinguishable in appearance from a circle except at very high magnification.

Given a Euclidean n-space, H_n=n+1.

Two graphs are homeomorphic if there is a graph isomorphism from some graph subdivision of one to some subdivision of the other.

Related to one another by a homomorphism.

Determined the possible values of r and n for which there is an identity of the form (x_1^2+...+x_r^2)(y_1^2+...+y_r^2)=z_1^2+...+z_n^2.

A divisor which is not a proper divisor.

While an equality A=B states that two mathematical expressions are equal, an inequation A!=B states that two expressions are not equal.

An operator of period 2, i.e., an operator * which satisfies ((a)^*)^*=a.

A vector field v for which the curl vanishes, del xv=0.

A polynomial in which the sum of subscripts is the same in each term.