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Two curves are tangent internally at a point P if they lie on the same side of their common tangent at P

An alternative spelling of the name "Chebyshev."

A technique is a specific method of performing an operation. The terms algorithm, method, and procedure are also used interchangeably.

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 set of four, also called a quartet.

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[].