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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 ...

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

An occurrence of a variable in a logic formula which is not inside the scope of a quantifier.

The surface of revolution generated by the external catenary between a fixed point a and its conjugate on the envelope of the catenary through the fixed point is equal in ...

An operator definition of a function. A Rodrigues formula may be converted into a Schläfli integral.

A group acts freely if there are no group fixed points. A point which is fixed by every group element would not be free to move.

A field automorphism of a field F is a bijective map sigma:F->F that preserves all of F's algebraic properties, more precisely, it is an isomorphism. For example, complex ...

The external (internal) similarity point of two fixed circles is the point at which all the circles homogeneously (nonhomogeneously) tangent to the fixed circles have the ...

A formula of first-order logic is in prenex normal form if it is of the form Q_1x_1...Q_nx_nM, (1) where each Q_i is a quantifier forall ("for all") or exists ("exists") and ...

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