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The point of coincidence of P and P^' in Fagnano's theorem.

The three diagonal points of a complete quadrilateral are never collinear.

A Fermat pseudoprime to a base a, written psp(a), is a composite number n such that a^(n-1)=1 (mod n), i.e., it satisfies Fermat's little theorem. Sometimes the requirement ...

A fiber space, depending on context, means either a fiber bundle or a fibration.

The finite group C_2×C_2 is one of the two distinct groups of group order 4. The name of this group derives from the fact that it is a group direct product of two C_2 ...

The geometry of Finsler space.

A topological space in which every point has a countable neighborhood system base for its neighborhood system.

When referring to a planar object, "fixed" means that the object is regarded as fixed in the plane so that it may not be picked up and flipped. As a result, mirror images are ...

A fixed point which has one zero eigenvector.

A flow line for a map on a vector field F is a path sigma(t) such that sigma^'(t)=F(sigma(t)).