3-webs with singularities
A 3-web with singularities is an ordered collection of three one-dimensional distributions L 1, L 2, L 3 on a 2-dimensional manifold M. The subset Σ ⊂ M where these distributions are not pairwise transversal is called the singularity set. Under some conditions on Σ we find the differential invariants of the 3-web with singularities at the points of Σ and give examples of calculation of these invariants.
Keywords and phrases3-webs G-structures singularity
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