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

The product of any number of perspectivities.

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.