flats(n,A)
If $A$ is a CentralArrangement, the flats are computed using the flats method from the Matroids package. Otherwise, $A$ is computed using the Orlik--Solomon algebra.
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If the rank is omitted, the flats of each rank are listed.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/HyperplaneArrangements.m2:2440:0.