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The discriminant of a binary quadratic form au^2+buv+cv^2 is defined by d=4ac-b^2. It is equal to four times the corresponding binary quadratic form determinant. ...

An algorithm for computing an Egyptian fraction (Stewart 1992).

A polynomial with 2 terms.

A convex planar domain in which the minimal generalized diameter is >1 always contains a circle of radius 1/3.

A (symmetrical) boundary set of radius r and center x_0 is the set of all points x such that |x-x_0|=r. Let x_0 be the origin. In R^1, the boundary set is then the pair of ...

For a fractal process with values y(t-Deltat) and y(t+Deltat), the correlation between these two values is given by the Brown function r=2^(2H-1)-1, also known as the ...

Brun's sieve was refined by J. B. Rosser, G. Ricci, and others.

The Riemann sphere C^*=C union {infty}, also called the extended complex plane. The notation C^^ is sometimes also used (Krantz 1999, p. 82). The notation C^* is also used to ...

The field of complex numbers, denoted C.

The points on a line can be put into a one-to-one correspondence with the real numbers.