FUNDAMENTAL SOLUTIONS FOR THE TRICOMI OPERATOR

By J. Barros-Neto, I. Gelfand. 2002

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A note on the fundamental solution for the Tricomi-type equation in the hyperbolic domain (2004, background): “Introduction Recently in[1,2] Barros-Neto and Gelfand constructed the fundamental solutions for the Tricomi operatorT , T u = yuxx + uyy .”
Global Existence for the n-Dimensional Semilinear Tricomi-Type Equations (2006, unknown): “(See, e.g., Barros-Neto and Gelfand, 1999/2002/2003; Yagdjian, 1997, 2004 for the bibliography.)”
On the global solution problem for semilinear generalized Tricomi equations, I (2015, methodology): “For instances, for linear g eneralized Tricomi equations, Barros-Neto and Gelfand in [1] and Yagdjian in [29] computed the fundamen tal solution explicitly.”
Critical exponents for semilinear equations of mixed elliptic‐hyperbolic and degenerate types (2003, methodology): “This invariance has been used in the research for fundamental solutions by Barros-Neto and Gelfand [2].”