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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.

A point at which two noncrossing branches of a curve meet with different tangents.

A translation without rotation or distortion.

If (sinalpha)/(sinbeta)=m/n, then (tan[1/2(alpha-beta)])/(tan[1/2(alpha+beta)])=(m-n)/(m+n).