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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[].

A function defined for all possible input values.

B_(p+k)=B_k+B_(k+1) (mod p), when p is prime and B_n is a Bell number.

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

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.