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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeMar 1st 2012
    • (edited Mar 1st 2012)

    added a bit to Heisenberg Lie algebra.

    Mostly, I wrote a section Relation to Poisson algebra with a discussion of how the Heisenberg algebra naturally sits inside the Lie algebra underlying the Poisson algebra.

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeMar 1st 2012

    Hm, right after saving this, the Lab went down…

    • CommentRowNumber3.
    • CommentAuthorzskoda
    • CommentTimeMar 1st 2012

    But, there seems no entry Heisenberg algebra.

    • CommentRowNumber4.
    • CommentAuthorUrs
    • CommentTimeMar 1st 2012
    • (edited Mar 1st 2012)

    Darn. Sorry. I meant to point to Heisenberg Lie algebra.

    [edit: I have made Heisenberg algebra a redirect now. ]

    • CommentRowNumber5.
    • CommentAuthorzskoda
    • CommentTimeMar 1st 2012
    • (edited Mar 1st 2012)

    Oh, now I see I even contributed to it (version 1)… :) It is growing nicely :)

    • CommentRowNumber6.
    • CommentAuthorUrs
    • CommentTimeMar 1st 2012

    Okay, thanks!

    • CommentRowNumber7.
    • CommentAuthorzskoda
    • CommentTimeMar 1st 2012
    • (edited Mar 1st 2012)

    I added a paragraph on the relation of Heisenberg Lie algebra to certain construction of associative algebras, so called Heisenberg double, which generalized the Weyl algebra. In fact there are several associative algebras related to Heisenberg algebra. One can look simply at its universal enveloping algebra. Then one can extend it by a central element and/or with the “number operator”. One obtains variants called Heisenbeg-Weyl algebra, Weyl algebra, CCR-algebra and alike, which for various authors mean the same or a different thing, depending if the central element is 1 or not, if the number operator NN is a separate generator or not and so on. I do not know how will nnLab solve this terminologically difficult point.

    • CommentRowNumber8.
    • CommentAuthorUrs
    • CommentTimeMar 1st 2012
    • (edited Mar 2nd 2012)

    Thanks. I have split that up into two new subsections: Relation to Weyl algebra and Relation to Heisenberg double.

    I am not sure if I understood your “if another central ement is added” correctly:

    let’s see: the Weyl algebra is the quotient of the universal enveloping algebra of the Heisenberg Lie algebra obtained by identifying the central elements with multiples of the identity (hence by removing a central element).

    Agreed?

    • CommentRowNumber9.
    • CommentAuthorzskoda
    • CommentTimeMar 2nd 2012
    • (edited Mar 2nd 2012)

    I agree; Weyl algebra is smaller. Heisenberg double generalizes Weyl algebra. CCR algebra (canonical commutation relation algebra, or boson oscillator algebra) is essentially the same as the Weyl algebra, possibly in infinite dimension, but the noncentral number operator is taken as central, however Na aN-a^\dagger a is central, so the question is if it is set to zero or not.

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