Communications on Pure and Applied Mathematics · 1963 · 154 citations · 3 references
Natural SciencesMathematicsDifferential EquationsBoundary ConditionsBoundary-value ProblemsInitial Value ProblemsPartial Differential EquationsSystems Of Differential EquationsWeak FormulationElliptic Boundary-value ProblemsLinear Partial Differential EquationsPartial Differential Equation SolversPartial Differential Equation SystemsStability Of Partial Differential Equations
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Differential equations without solutions
Lars Hörmander · Mathematische Annalen · 1960 · 71 citations
Differential operators of principal type
Lars Hörmander · Mathematische Annalen · 1960 · 61 citations