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Let A be a closed convex subset of a Banach space and assume there exists a continuous map T sending A to a countably compact subset T(A) of A. Then T has fixed points.

A surface possessing a saddle point.

The value at a stationary point.

When a point P moves along a line through the circumcenter of a given triangle Delta, the pedal circle of P with respect to Delta passes through a fixed point (the Griffiths ...

A point of discontinuity, also called a leap.

For every partition of all the points on a line into two nonempty sets such that no point of either lies between two points of the other, there is a point of one set which ...

A biflecnode, also called a biflecnodal point, is a point at which a curve crosses itself and is at the same time an inflection point. Biflecnodes are possible for curves of ...

The locus of a point which is derived from a fixed point Q by continuous parallel displacement.

The point that inversion of a curve is performed with respect to.

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