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The incenter I is the center of the incircle for a polygon or insphere for a polyhedron (when they exist). The corresponding radius of the incircle or insphere is known as ...

An ordinary differential equation of the form y^('')+P(x)y^'+Q(x)y=0. (1) Such an equation has singularities for finite x=x_0 under the following conditions: (a) If either ...

A Cevian point P is point with respect to which a set of Cevians of a triangle are taken. Connecting the endpoints of the Cevians through a point P gives the so-called Cevian ...

A number x such that for all epsilon>0, there exists a member of the set y different from x such that |y-x|<epsilon. The topological definition of limit point P of A is that ...

For any point P on the boundary of an ordinary ball, find a neighborhood of P in which the intersection with the ball's boundary cuts the neighborhood into two parts, each ...

An interval into which a given data point does or does not fall.

Two or more lines which intersect in a point are said to concur.

Not continuous. A point at which a function is discontinuous is called a discontinuity, or sometimes a jump.

The head of a vector AB^-> is the endpoint B, i.e., the point at which the arrow is placed.

The central point in a wheel graph W_n. The hub has degree n-1.