There is a tag complex-multiplication. Naturally, it's used for all sorts of questions about multiplying things. They don't even have to be complex numbers; as long as it's something complicated=complex, the name seems to fit perfectly. Yet, the tag excerpt says The theory of elliptic cu...
5:43 AM
Matt, I tried, but below 20K I can only suggest the description wiki. I know because I used a new one "complex-multiplication" recently and Willie Wong asked me to provide a description. It turned out that was not permanent, and he fiddled it into final shape the next day. — Will Jagy Dec 27 '12 at 21:02
@WillieWong, created a tag and a vanilla tag wiki. I'm not sure people know what that is, i didn't when you talked about it for "complex-multiplication" — Will Jagy Aug 2 '13 at 20:30
Tag-excerpt was created by Will Jagy: math.stackexchange.com/posts/256569/revisions Tag-wiki was created by Willie Wong: math.stackexchange.com/posts/256568/revisions
Oct 11 '15 at 20:48, by Martin Sleziak
Martin, saw your comments at my "new/rare tags" answer, thanks. I simply deleted it. The first time I made a tag, complex-multiplication as in the David Cox book Primes of the form $x^2 + n y^2:$ Fermat, Class Field Theory, and Complex Multiplication, Willie Wong asked me what should go in the tag information; later he said he was mostly worried people would use it for instructions about how to multiply complex numbers. Anyway, i did figure out that I was supposed to put in some information for any tag I made; there have not been many. — Will Jagy 1 hour ago
So there are several references in the comments (the last one is now deleted) to the fact that Will Jagy created the tag and Willie Wong asked him to created tag-wiki. (However, I did not find meta-post, comment, chat conversation where this happened.)
@WillieWong, I'm under 20K so I guess I proposed such a line. I just carried over the tag from MO, and do not really know how it should be described. I do have reason (an expert) to believe it plays a part in my question. — Will Jagy Dec 11 '12 at 21:03
@WillJagy: okay. With the hints you gave I found the Wikipedia article and put in a stub. Mainly I want to clarify that the tag should not be used for the multiplication of complex numbers. — Willie Wong Dec 12 '12 at 9:00
@WillieWong, I see you put that in, about not multiplying complex numbers. All I know on the topic is in the David A. Cox book Primes of the Form $x^2 + n y^2.$ However, it was actually a comment of one Jonathan Hanke that the example in this question is CM, out of roughly 25 very similar examples. — Will Jagy Dec 12 '12 at 22:10
6:46 AM
I vaguely remembered that I have heard about the tag complex-multiplication before. I thought there was a bit longer discussion, but it seems I was wrong. Probably I remembered it from Will Jagy's comment (now deleted) on my post. The comment was a reaction to my comments here.
13 hours later…
7:57 PM
8:29 PM
Based on the comments to the above question, this seems to be one of the differences between merging and synonymizing two tags.
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