The coloops of a matroid M are the loops of the dual matroid. The set of coloops of M equals both the intersection of the bases of M, and the complement of the union of the circuits of M.
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The object coloops is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Matroids/doc-Matroids.m2:889:0.