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A vector field is a section of its tangent bundle, meaning that to every point x in a manifold M, a vector X(x) in T_xM is associated, where T_x is the tangent space.

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 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.

A 14-sided polygon, sometimes called a tetrakaidecagon.