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nLab > Latest Changes: propagation of singularities theorem

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  1.  
    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeAug 4th 2017
    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeNov 23rd 2017
    • (edited Nov 23rd 2017)

    I filled in the previously missing definitions of the technical assumptions of the theorem (here), also gave them their own stand-alone entries: proper support and symbol order of pseudo-differential operators.

  3. Changed the stamtement to indicate that only wf(u)\wf(f) (rather than all of wf(u)) is invariant under the bicharacteristic flow, as stated in the cited source by Duistermaat and Hörmander.

    Anonymous

    diff, v9, current

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