The definition in 1d is poorly phrased: it should read "the bases of M* are the complements of bases of M; the independent sets in M* are all subsets of these bases of M*". Thanks to Srivatsan for pointing this out.

The definition in 1d is poorly phrased: it should read "the bases of M* are the complements of bases of M; the independent sets in M* are all subsets of these bases of M*". Thanks to Srivatsan for pointing this out.

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