Basic constructor for fans that takes a matrix containing the rays of the fan and a list of lists with the indices of the rays in the maximal cones. Optionally one may provide a lineality space.
This constructor does not check well-definedness, see isWellDefined.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Polyhedra/documentation/documentation.m2:253:0.