Abstract
We study generic distributions D⊂TM of corank 2 on manifolds M of dimension n⩾5. We describe singular curves of such distributions, also called abnormal curves. For n even the singular directions (tangent to singular curves) are discrete lines in D(x), while for n odd they form a Veronese curve in a projectivized subspace of D(x), at generic x∈M. We show that singular curves of a generic distribution determine the distribution on the subset of M where they generate at least two different directions. In particular, this happens on the whole of M if n is odd. The distribution is determined by characteristic vector fields and their Lie brackets of appropriate order. We characterize pairs of vector fields which can appear as characteristic vector fields of a generic corank 2 distribution, when n is even.
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