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The map x^' = x+1 (1) y^' = 2x+y+1, (2) which leaves the parabola x^('2)-y^'=(x+1)^2-(2x+y+1)=x^2-y (3) invariant.

A tensor g whose discriminant satisfies g=g_(11)g_(22)-g_(12)^2>0.

The product of any number of perspectivities.

The pseudosphere is the constant negative-Gaussian curvature surface of revolution generated by a tractrix about its asymptote. It is sometimes also called the tractroid, ...

A plane figure for which quadrature is possible is said to be quadrable.

The number theta in the quadric (x^2)/(a^2+theta)+(y^2)/(b^2+theta)+(z^2)/(c^2+theta)=1 is called the parameter.

The point with respect to which a radial curve is computed.

The point of illumination for a caustic.

A shift in phase.

A surface possessing a saddle point.