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orlikSolomon(..., Projective => ...) -- specify projective complement

Description

Projective => true specifies the cohomology ring of the complement of the hyperplanes in complex projective space. For practical reasons (at the expense of some elegance) an affine chart for the complement is chosen by making the hyperplane numbered n the hyperplane at infinity. By default, n=0; otherwise, use the option HypAtInfinity => n.

Further information