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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.

A 14-sided polygon, sometimes called a tetrakaidecagon.

The three 3-polyiamonds are called tetriamonds.

Q is said to be tightly embedded if |Q intersection Q^g| is odd for all g in G-N_G(Q), where N_G(Q) is the normalizer of Q in G.

The Tits group is a group of order 17971200. It is implemented in the Wolfram Language as TitsGroupT[].

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