Subelliptic Cordes Estimates

@inproceedings{Manfredi2004SubellipticCE,
  title={Subelliptic Cordes Estimates},
  author={Juan J. Manfredi},
  year={2004}
}
We prove Cordes type estimates for subelliptic linear partial differential operators in non-divergence form with measurable coefficients in the Heisenberg group. As an application we establish interior horizontal W 2,2regularity for p-harmonic functions in the Heisenberg group H1 for the range √ 17−1 2 ≤ p < 5+ √ 5 2 . 

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