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The set of all centroid points in a weighted tree (Harary 1994, p. 36).

The cubic curve defined by ax^3+bx^2+cx+d=xy with a!=0. The curve cuts the axis in either one or three points. It was the 66th curve in Newton's classification of cubics. ...

Values of the trigonometric functions can be expressed exactly for integer multiples of pi/20. For cosx, cos(pi/(20)) = 1/4sqrt(8+2sqrt(10+2sqrt(5))) (1) cos((3pi)/(20)) = ...

The function psi(x)={x(1-(x^2)/(c^2))^2 for |x|<c; 0 for |x|>c (1) sometimes used in robust estimation. It has a minimum at x=-c/sqrt(5) and a maximum at x=c/sqrt(5), where ...

Except for triangles, every simple polygon has at least two nonoverlapping ears.

An error in a statistical test which occurs when a true hypothesis is rejected (a false negative in terms of the null hypothesis).

A multiplicative character is called unitary if it has absolute value 1 everywhere.

A horizontal line placed above multiple quantities to indicate that they form a unit. It is most commonly used to denote 1. A radical (sqrt(12345)), 2. Repeating decimals ...

A conjecture which treats the heights of points relative to a canonical class of a curve defined over the integers.

The satellite knot of an unknot twisted inside a torus.