contraction(M, S)
M / S
The contraction of M by S is given by M/S := (M* \ S)*, where * stands for dual, and \ is deletion.
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The object contraction 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.m2:1416:0.