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

An equation or formula involving transcendental functions.

A transformation of period 2.

A relation R on a set S is transitive provided that for all x, y and z in S such that xRy and yRz, we also have xRz.

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.

One of the four 3-polyaboloes.

A set with three elements.

The unique 3-polyiamond, illustrated above.

A 13-sided polygon, sometimes also called the triskaidecagon.