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    • CommentRowNumber1.
    • CommentAuthorEric
    • CommentTimeMay 23rd 2010

    Not sure if it is a CSS/browser issue, but coloneq (∶−\coloneq) is not rendering correctly for me on the nLab (or nForum). It looks like “:-” to me. (Firefox 3.6)

    • CommentRowNumber2.
    • CommentAuthorHarry Gindi
    • CommentTimeMay 23rd 2010
    • (edited May 23rd 2010)

    Same in opera. Why don’t you just use :=:=?

    • CommentRowNumber3.
    • CommentAuthorMike Shulman
    • CommentTimeMay 23rd 2010

    That’s what “coloneq” is supposed to be! To get := you need coloneqq, two q’s. I have no idea why they named them that way.

    • CommentRowNumber4.
    • CommentAuthorEric
    • CommentTimeMay 23rd 2010

    hehe :)

    Ok. I think coloneq appears several places on the nLab when it should be coloneqq, but that could be my fault. I’ll add these to special characters.

    • CommentRowNumber5.
    • CommentAuthorEric
    • CommentTimeMay 23rd 2010

    I searched for coloneq and replaced it with coloneqq on canonical morphism and smooth loop space. I also added coloneq and coloneqq to special characters.

    I might go around to a few pages and replace “:=” with coloneqq (time permitting), but that is not a big deal. I’ll likely just keep a passive eye out for it. This is just a minor cosmetic thing (for a Lab Elf). No big deal.

    • CommentRowNumber6.
    • CommentAuthorTobyBartels
    • CommentTimeMay 23rd 2010

    There are (at least) two different LaTeX character packages that provide something called \coloneq. In one of them (the one which iTeX mimics), that command produces ‘∶−\coloneq’, while you need \coloneqq to produce ‘\coloneqq’. In the other, the command produces ‘\coloneqq’, while you need (I think) \colonminus to get ‘∶−\coloneq’. So people who spell it wrong may just be familiar with the other package.

    • CommentRowNumber7.
    • CommentAuthorMike Shulman
    • CommentTimeMay 23rd 2010

    Wow, what a bad idea!

    • CommentRowNumber8.
    • CommentAuthorHarry Gindi
    • CommentTimeMay 23rd 2010

    Wow, what a bad idea!

    I give your reaction a 10/10!

    • CommentRowNumber9.
    • CommentAuthorTobyBartels
    • CommentTimeMay 23rd 2010

    Wow, what a bad idea!

    I assume that whichever package came second didn’t know about the one that came first; they’re both fairly old and may even predate CTAN. (But that’s just a guess; I don’t really know the history.)

    • CommentRowNumber10.
    • CommentAuthorMike Shulman
    • CommentTimeMay 23rd 2010

    I’ve never understood why anyone would use \coloneq for ∶−\coloneq, since there’s nothing “eq” about it. \colonminus makes much more sense.

    • CommentRowNumber11.
    • CommentAuthorTobyBartels
    • CommentTimeMay 23rd 2010

    The theory is eq for one bar, eqq for two. Compare \leq (‘\leq’) and \leqq (‘\leqq’), where that convention comes from and makes more sense.

    • CommentRowNumber12.
    • CommentAuthorMike Shulman
    • CommentTimeMay 24th 2010

    I, um, see. I agree that the convention makes sense for \leq and \leqq but that doesn’t mean that it makes any sense for \coloneq and \coloneqq. If that’s the theory, then I think someone wasn’t thinking.

    • CommentRowNumber13.
    • CommentAuthorTobyBartels
    • CommentTimeMay 26th 2010

    Well, I like that theory. I even \let \neqq \ne to take advantage of it (and never use \neq, nor \le for that matter). However, I would probably pick \colonminus and \coloneqq as the least ambiguous terms, avoiding \coloneq entirely.

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