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The triangle DeltaA^'B^'C^' formed by the points of pairwise intersection of the three intangents. It is not in perspective with DeltaABC. It has trilinear vertex matrix ...

A definition of a set by mentioning a defining property.

The use of three prior points in a root-finding algorithm to estimate the zero crossing.

The radius used in performing an inversion with respect to an inversion circle.

The isogonal transform of a geometric object is the object obtained by collectively taking the isogonal conjugates of all its points.

The isotomic transform of a geometric object is the object obtained by collectively taking the isotomic conjugates of all its points.

Given a convex plane region with area A and perimeter p, then |N-A|<p, where N is the number of enclosed lattice points.

The Labs septic is a septic surface having 99 ordinary double points, which is the maximum number known for any septic surface.

Coefficients which appear in Lagrange interpolating polynomials where the points are equally spaced along the abscissa.

Lemoine geometry is that part of triangle geometry concerned with symmedians and symmedian points.