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A string or word is said to be admissible if that word appears in a given sequence. For example, in the sequence aabaabaabaabaab..., a, aa, baab are all admissible, but bb is ...

Any link can be represented by a closed braid.

A set (usually of letters) from which a subset is drawn. A sequence of letters is called a word, and a set of words is called a code.

The payment of a debt plus accrued interest by regular payments.

An Andreini tessellation is a three-dimensional equivalent of a semiregular tessellation. There are 28 such tessellations.

The angle bisector of an angle in a triangle divides the opposite side in the same ratio as the sides adjacent to the angle.

A term in social choice theory meaning invariance of a result under permutation of voters.

An operator * for which a*b=-b*a is said to be anticommutative.

For operators A^~ and B^~, the anticommutator is defined by {A^~,B^~}=A^~B^~+B^~A^~.

Given ∠AXB+∠AYB=pi radians in the above figure, then X and Y are said to be antigonal points with respect to A and B.