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An example of a weakly hyperbolic Cauchy problem not well posed in C∞

Ferruccio Colombini, Sergio Spagnolo

Acta Mathematica · 1982 · 130 citations · 2 references

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2

Analytic extensions of differentiable functions defined in closed sets

Hassler Whitney · Transactions of the American Mathematical Society · 1934 · 859 citations

, , +5

THE THEORY OF PARTIAL DIFFERENTIAL EQUATIONS

F. G. Friedlander · Bulletin of the London Mathematical Society · 1975 · 472 citations

, , +7