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On Highly Degenerate CR Maps of Spheres

  • Giuseppe della Sala,
  • Bernhard Lamel,
  • Michael Reiter,
  • Duong Ngoc Son

摘要

For \(N \ge 4\) N 4 we classify the \((N-3)\) ( N - 3 ) -degenerate smooth CR maps of the three-dimensional unit sphere into the \((2N-1)\) ( 2 N - 1 ) -dimensional unit sphere. Each of these maps has image being contained in a five-dimensional complex-linear space and is of degree at most two, or equivalent to one of the four maps into the five-dimensional sphere classified by Faran. As a byproduct of our classification we obtain new examples of rational maps of degree three which are \((N-3)\) ( N - 3 ) -degenerate only along a proper real subvariety and are not equivalent to polynomial maps. In particular, by changing the base point, it is possible to construct new families of nondegenerate maps.