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Since (2a)/(a+b)=(2ab)/((a+b)b), (1) it follows that a/((a+b)/2)=((2ab)/(a+b))/b, (2) so a/A=H/b, (3) where A and H are the arithmetic mean and harmonic mean of a and b. This ...

A number s of trials in which the probability of success p_i varies from trial to trial. Let x be the number of successes, then var(x)=spq-ssigma_p^2, (1) where sigma_p^2 is ...

A line segment where two faces of a polyhedron meet, also called a side.

A matrix whose entries are polynomials.

The number of digits used to perform a given computation. The concepts of accuracy and precision are both closely related and often confused. While the accuracy of a number x ...

If f(x) is a nonconstant integer polynomial and c is an integer such that f(c) is divisible by the prime p, that p is called a prime divisor of the polynomial f(x) (Nagell ...

A data structure designed to allow repeated extraction of the smallest remaining key (Skiena 1990, p. 38).

A group of four elements, also called a quadruplet or tetrad.

Let R be a commutative ring. A category C is called an R-category if the Hom-sets of C are R-modules.

A robust estimation based on a rank test.