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The unique 3-polyiamond, illustrated above.

A polynomial with three terms.

A set of positive integers is called weakly triple-free if, for any integer x, the set {x,2x,3x} !subset= S. For example, all subsets of {1,2,3,4,5} are weakly triple-free ...

In the American system, 10^(36).

A transformation of the form A^'=UAU^(H), where U^(H) denotes the conjugate transpose.

If s_x is the standard deviation of a set of samples x_i and x^_ their mean, then the variation coefficient is defined as V=(s_x)/(x^_).

A k-chain whose bounding (k-1)-chain vanishes.

n-dimensional Euclidean space.

One form of van der Waerden's theorem states that for all positive integers k and r, there exists a constant n(r,k) such that if n_0>=n(r,k) and {1,2,...,n_0} subset C_1 ...

The point at which a curve or function crosses the x-axis (i.e., when y=0 in two dimensions).