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Sign Vector

A sign vector on a finite
ground set E is a vector in {-,+,0}^{E}.

For example, X = (+,0,+,-) is a sign vector on a ground set of
cardinality 4, say E = {1,2,3,4}.

Usually, we simply write X = (+0+-) or X = +0+-.

The sign corresponding to an element e in E
is denoted by X_{e}.

Maintained by Lukas Finschi (finschi [at] ifor.math.ethz.ch)