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A point v is a

**central**point of a graph if the eccentricity of the point equals the graph radius. The set of all**central**points is called the graph center.The Yff

**central**circle, a term coined here for the first time, is the circumcircle of the Yff**central**triangle.A

**central**angle is an angle ∠AOC with endpoints A and C located on a circle's circumference and vertex O located at the circle's center (Rhoad et al. 1984, p. 420). A**central**...A triangle line lalpha+mbeta+ngamma=0 defined relative to a reference triangle is called a

**central**line iff l:m:n is a triangle center (Kimberling 1998, p. 127). If l:m:n is ...A dilation that is not merely a translation. Two triangles related by a

**central**dilation are said to be perspective triangles because the lines joining corresponding vertices ...The

**central**difference for a function tabulated at equal intervals f_n is defined by delta(f_n)=delta_n=delta_n^1=f_(n+1/2)-f_(n-1/2). (1) First and higher order**central**...A moment mu_n of a univariate probability density function P(x) taken about the mean mu=mu_1^', mu_n = <(x-<x>)^n> (1) = int(x-mu)^nP(x)dx, (2) where <X> denotes the ...

The Lucas

**central**circle is the circumcircle of the Lucas**central**triangle. The center, radius, and circle function appear to be complicated, and neither the center nor the ...The

**central**factorials x^([k]) form an associated Sheffer sequence with f(t) = e^(t/2)-e^(-t/2) (1) = 2sinh(1/2t), (2) giving the generating function ...Given a circle expressed in trilinear coordinates by a

**central**circle is a circle such that l:m:n is a triangle center and k is a homogeneous function that is symmetric in ......