Hypoellipticity and loss of derivatives with Appendix Analyticity and loss of derivatives

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/107709For each value of k, two complex vector fields satisfying the bracket condition are exhibited the sum of whose squares is hypoelliptic but not subelliptic - in fact the operator loses k-1 derivatives in Sobolev norms. In the Appendix it is proven that this operator is analytic hypoelliptic.44 pages including appendixAnalysis of PDEs35H10, 35N15Hypoellipticity and loss of derivatives with Appendix Analyticity and loss of derivativestext