flat(A,L)
With the option Validate => true (which is the case by default), flat(A,L) checks to see whether $L$ is indeed the list of indices of a flat of $A$.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/HyperplaneArrangements.m2:2405:0.