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A set of four, also called a quartet.

A 14-sided polygon, sometimes called a tetrakaidecagon.

The three 3-polyiamonds are called tetriamonds.

The tensor defined by T^l_(jk)=-(Gamma^l_(jk)-Gamma^l_(kj)), where Gamma^l_(jk) are Christoffel symbols of the first kind.

A function defined for all possible input values.

A curve which intersects some straight line in an infinity of points (but for which not every point lies on this curve).

An equation or formula involving transcendental functions.

A transformation of period 2.

A transversal line is a line which intersects each of a given set of other lines. It is also called a semisecant.

A lottery in which three numbers are picked at random from the integers 1-14.