rank A
The center of a hyperplane arrangement is the intersection of its defining affine-linear equations. The rank of a hyperplane arrangement is the codimension of its center.
We illustrate this method with some basic examples.
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The trivial arrangement has no equations.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/HyperplaneArrangements.m2:1572:0.