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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 Feuerbach point X_(11) (center of the Feuerbach hyperbola) lies on the nine-point circle. The Feuerbach antipode is the antipode of this point on nine-point circle. It ...

A point that lies on one of the sides of a triangle but is a not vertex.

A fixed point for which the stability matrix has equal negative eigenvalues.

A fixed point for which the stability matrix has equal positive eigenvalues.

A fixed point for which the stability matrix has equal nonzero eigenvectors.

The Gibert point can be defined as follows. Given a reference triangle DeltaABC, reflect the point X_(1157) (which is the inverse point of the Kosnita point in the ...

A point which does not lie on at least one ordinary line.

The bifurcation of a fixed point to a limit cycle (Tabor 1989).

The point of concurrence of the six planes in Monge's tetrahedron theorem.