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A group of five elements, also called a quintuple or pentad.

A sequence produced by the instructions "reverse, add to the original, then sort the digits." For example, after 668, the next iteration is given by 668+866=1534, so the next ...

A quadratic field Q(sqrt(D)) with D>0.

A refinement X of a cover Y is a cover such that every element x in X is a subset of an element y in Y.

When discussing a rotation, there are two possible conventions: rotation of the axes, and rotation of the object relative to fixed axes. In R^2, consider the matrix that ...

In the American system, 10^(21).

rho_(2s)(n)=(pi^s)/(Gamma(s))n^(s-1)sum_(p,q)((S_(p,q))/q)^(2s)e^(2nppii/q), where S_(p,q) is a Gaussian sum, and Gamma(s) is the gamma function.

The probability that a statistical test will be negative for a negative statistic.

The value at a stationary point.

The relationship x succeeds (or follows) y is written x≻y. The relation x succeeds or is equal to y is written x>=y.