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Two curves are tangent externally at a point P if they lie on opposite sides of their common tangent at P

Two curves are tangent internally at a point P if they lie on the same side of their common tangent at P

The polygon formed by the lines tangent to the circumcircle of a polygon. The tangential polygon of an n-gon is itself an n-gon.

An alternative spelling of the name "Chebyshev."

A technique is a specific method of performing an operation. The terms algorithm, method, and procedure are also used interchangeably.

A sum in which subsequent terms cancel each other, leaving only initial and final terms. For example, S = sum_(i=1)^(n-1)(a_i-a_(i+1)) (1) = ...

A quantity which transforms like a tensor except for a scalar factor of a Jacobian.

One of the 14 4-polyaboloes.

A 40-sided polygon.

A set of four, also called a quartet.