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nLab > Latest Changes: positive operator

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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeOct 2nd 2013

    brief definition: positive operator

    • CommentRowNumber2.
    • CommentAuthorGuest
    • CommentTimeOct 26th 2022
    The article about positive operators (https://ncatlab.org/nlab/show/positive+operator) defines a positive operator in terms of a positive quadratic form.

    But there is no definition of a positive quadratic form. Only of positive *definite* quadratic forms.

    This leaves the exactly correct definition of a positive operator UNCLEAR.
    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeSep 12th 2023

    added mentioning of the notion in dagger-categories

    diff, v9, current

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