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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.

A square prism is prism with square base and is therefore a special case of a cuboid.

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

The set closure of the set of arguments of a function f for which f is not zero.

From the feet H_A, H_B, and H_C of each altitude of a triangle DeltaABC, draw lines (H_AP_A,H_AQ_A), (H_BP_B,H_BQ_B), (H_CP_C,H_CQ_C) perpendicular to the adjacent sides, as ...