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    • 3-webs with singularities 

      Arias Amaya F.A.; Arteaga Bejarano J.R.; Malakhaltsev M. (Maik Nauka-Interperiodica Publishing, 2016)
      A 3-web with singularities is an ordered collection of three one-dimensional distributions L1, L2, L3 on a 2-dimensional manifold M. The subset Σ ⊂ M where these distributions are not pairwise transversal is called the ...