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The concurrence S of the Euler lines E_n of the triangles DeltaXBC, DeltaXCA, DeltaXAB, and DeltaABC where X is the incenter. It has equivalent triangle center functions ...

Three concurrent homologous lines pass respectively through three fixed points on the similitude circle which are known as the invariable points.

If the four points making up a quadrilateral are joined pairwise by six distinct lines, a figure known as a complete quadrangle results. A complete quadrangle is therefore a ...

The portion of the probability distribution which has a P-value equal to the observed P-value.

On the Clebsch diagonal cubic, all 27 of the complex lines present on a general smooth cubic surface are real. In addition, there are 10 points on the surface where three of ...

A pair of values x and y one or both of which is complex.

A pole of multiplicity less than p+1.

If intersecting stable and unstable manifolds (separatrices) emanate from fixed points of different families, they are called heteroclinic points.

A node in a graph for which the graph eccentricity equals the graph diameter (Harary 1994, p. 41).

External (or positive) and internal (or negative) similarity points of two circles with centers C and C^' and radii r and r^' are the points E and I on the lines CC^' such ...