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nLab > Latest Changes: red herring principle and non-associative algebras

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  1.  
    • CommentRowNumber1.
    • CommentAuthorTim_Porter
    • CommentTimeDec 11th 2012
    • (edited Dec 11th 2012)

    Someone anonymous has deleted a paragraph at red herring principle on non-associative algebra. This seems a bit strange. I am no expert on those beasties but although non-associative algebra includes the study of Lie algebras etc., amongst them are the modules and it seems to me that a module (with trivial multiplication) considered as a Lie algebra is an associative non-associative algebra! The query by Toby further down the entry is relevant but if we assume ‘non-unital’ as well (and that is sometimes done) there is no problem.

    There was no post to the Forum. The IP is 2.40.78.132. which is in Trieste it seems.

    Should the paragraph be reinstated?

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeDec 11th 2012
    • (edited Dec 11th 2012)

    Thanks for watching out for this!

    I suppose one could have different opinions on whether “Lie algebra” is an “algebra as used in linear algebra”, and maybe that paragraoph could be tweaked a bit. But what worries me here is that people remove material without any announcement here. We’d have enough signposts on the HomePagethat advice not to do that, I would think. What else could we do?

    I have to run now. But if somebody finds the time to re-instantiate that paragraph and maybe addd a bit re Lie algebras etc., that would be good.

    • CommentRowNumber3.
    • CommentAuthorTim_Porter
    • CommentTimeDec 11th 2012

    Your worry mirrors mine, hence my post here.

    • CommentRowNumber4.
    • CommentAuthorTobyBartels
    • CommentTimeDec 11th 2012

    I have rolled it back.

    • CommentRowNumber5.
    • CommentAuthorTobyBartels
    • CommentTimeDec 11th 2012

    I rewrote that paragraph a bit too.

    • CommentRowNumber6.
    • CommentAuthorDavidRoberts
    • CommentTimeDec 12th 2012

    I was thinking of adding a point

    • Complete semi-simplicial sets, now just called simplicial sets, where at one point called just semi-simplicial sets, though that term originally referred to a weaker concept. Now when people refer to semi-simplicial sets, they may need to specify they mean the original version, not the temporary definition seen in older papers.

    but I’m not certain that it is an instance of the red-herring principle, but also not sure it falls under the ’non-examples’ section. Any thoughts?

    • CommentRowNumber7.
    • CommentAuthorMike Shulman
    • CommentTimeDec 12th 2012

    I wouldn’t classify that as either.

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