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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.
If a map f:G->G^' from a group G to a group G^' satisfies f(ab)=f(b)f(a) for all a,b in G, then f is said to be an antihomomorphism.
The antilaplacian of u with respect to x is a function whose Laplacian with respect to x equals u. The antilaplacian is never unique.
The inverse function of the logarithm, defined such that log_b(antilog_bz)=z=antilog_b(log_bz). The antilogarithm in base b of z is therefore b^z.
A paradox or contradiction.
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