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The slicing of a three-dimensional object by a plane (or more general slice).

The problem of determining (or counting) the set of all solutions to a given problem.

A distribution of error such that the error remaining is always given approximately by the last term dropped.

A game which permits a draw ("tie") when played properly by both players. Tic-tac-toe, for example, is a futile game.

A symmetric block design (4n+3, 2n+1, n) which is equivalent to a Hadamard matrix of order 4n+4. It is conjectured that Hadamard designs exist for all integers n>0, but this ...

An inner automorphism of a group G is an automorphism of the form phi(g)=h^(-1)gh, where h is a fixed element of G. The automorphism of the symmetric group S_3 that maps the ...

Little-omega notation is the inverse of the Landau symbol o, i.e., f(n) in o(phi(n)) <==> phi(n) in omega(f(n)).

For a partial order, the size of the longest antichain is called the width.

The doublestruck letter R denotes the field of real numbers.

The operation of taking an nth root of a number.