Proceedings of the Japan Academy Series A Mathematical Sciences · 1975 · 13 citations · 6 references
Natural SciencesMathematicsDifferential EquationsBoundary ConditionsOperator TheoryPartial Differential EquationsVariational FormulationParabolic Boundary-value ProblemsParabolic Partial Differential EquationsPseudodifferential Operators
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Hypoelliptic second order differential equations
Lars Hörmander · Acta Mathematica · 1967 · 2.4K citations · Full text