isSimple M
A matroid is simple if it has no loops or parallel classes; equivalently, it has no circuits of size <= 2.
Among the class of simple matroids, the lattice of flats is a complete invariant. Every matroid has a unique simplification which has the same lattice of flats.
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Note that the dual of a simple matroid may not be simple:
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Matroids/doc-Matroids.m2:2728:0.