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Ann. Univ. Ferrara - Sez. VII - Sc. Mat. Suppl. Vol. XLV, 197-211 (1999) On the Lagrangian Regularity Near non-Transversal Crossing of Lagrangian Manifolds. PASCAL LAUBIN (*) To tt~e memory of Lamberto Cattabriga 1. - Introduction. In [12], a class of lagrangian distributions associated to a pair of conic la- grangian submanifolds with transversal crossing is used to construct in the C~ framework a parametrix of the Cauchy problem for an operator with multiple involutive characteristics. In this paper, we review a more general construc- tion in the Co and analytic category using some ideas from second microlocal- ization. An application is given to the lagrangian properties of the solution at the transition from the shadow to the illuminated region in diffraction theory. First in the C~ framework and using the canonical invariance, we prove that the solution belongs to a class of lagrangian distributions associated to a pair of lagrangian submanifolds. As a consequence, we see that, for a conormal data, the second wave front lies in a lagrangian submanifold. We next investigate the same problem in the analytic category. Here we use the geometry of complex canonical transforms and the H~ spaces of SjSs- trand. We generalize
ANNALI DELL UNIVERSITA DI FERRARA – Springer Journals
Published: Jan 1, 1999
Keywords: Cotangent Bundle; Principal Symbol; Lagrangian Submanifolds; Lagrangian Manifold; Microlocal Analysis
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