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co- +‎ null

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conull (not comparable)

  1. (mathematics) Having a null complement
    • 2016, Anton Bernshteyn, “Measurable versions of the Lovász Local Lemma and measurable graph colorings”, in arXiv[1]:
      Moreover, if the combinatorial structure on   is "induced" by the  -shift action of a countable group  , then, even without any local finiteness assumptions, there is a Borel choice for   which satisfies the constraints on an invariant conull set (i.e., with  ).