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Differential operators of principal type

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References

  1. Bourbaki, N.: Espaces vectoriels topologiques. Chap. III–V. Paris 1955.

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  1. Stockholm

    Lars Hörmander

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  1. Lars Hörmander
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Hörmander, L. Differential operators of principal type. Math. Ann. 140, 124–146 (1960). https://doi.org/10.1007/BF01360085

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