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The point at which a curve or function crosses the y-axis (i.e., when x=0 in two dimensions).

The trilinear pole of the orthotransversal of a point P is called its orthocorrespondent. The orthocorrespondent of a point P=p:q:r is given by where S_A, S_B, and S_C is ...

A quantitative measure of the simplicity of a geometric construction which reduces geometric constructions to five steps. It was devised by È. Lemoine. S_1 Place a ...

For a point y in Y, with f(y)=x, the ramification index of f at y is a positive integer e_y such that there is some open neighborhood U of y so that x has only one preimage ...

In a given triangle DeltaABC with all angles less than 120 degrees (2pi/3, the first Fermat point X or F_1 (sometimes simply called "the Fermat point," Torricelli point, or ...

The absolute moment of M_n of a probability function P(x) taken about a point a is defined by M_n=int|x-a|^nP(x)dx.

The strophoid of a circle with pole at the center and fixed point on the circumference is a Freeth's nephroid.

Any linear system of point-groups on a curve with only ordinary singularities may be cut by adjoint curves.

A stable fixed point of a map which, in a dissipative dynamical system, is an attractor.

For a parabola oriented vertically and opening upwards, the vertex is the point where the curve reaches a minimum.