Talk:ℸ
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Symbol: "The fourth transfinite cardinal". I find it quite implausible. The fourth transfinite cardinal is a relatively dull mathematical object, and whenever one does need to refer to it, ℵ3 suffices; there is no need for this notation.
In fact, I doubt it is attestable in any consistent sense at all. On arXiv I could only find this paper (on page 43), which looks like an ad-hoc definition, and an astrophysics paper (page 9), which is not even a use, but a mention. — Keφr 07:23, 9 December 2014 (UTC)
- A while ago, someone asked if ẘ was ever actually used, and User:Prosfilaes was able to ask the Unicode list, and someone there was able to dig up old paper records of why it was added to Unicode. Perhaps Prosfilaes can ask about this character and get some pointers to where it may have actually been used. Alternatively, perhaps User:Msh210 knows something about it. - -sche (discuss) 03:08, 17 December 2014 (UTC)
- I didn't ask the Unicode list, but I noticed The Not So Short Introduction to LaTeX 2e mentioned it as part of the symbols included in AMS-LaTeX. It was in AMS-TeX, which dates back to 1981-1984, but I don't know if it appeared in any version predating Unicode. However, the AMS apparently considered it useful enough to include (or just dragged it along when they copied Unicode).--Prosfilaes (talk) 13:12, 21 December 2014 (UTC)
- I've no idea. Perhaps one of these folks can help.—msh210℠ (talk) 07:41, 31 December 2014 (UTC)
- I've asked w:Talk:List of mathematical symbols and w:Talk:List of logic symbols. Let's leave this open for a while longer and see if anyone there responds. - -sche (discuss) 21:46, 22 February 2015 (UTC)
- It's been two weeks and no one on 'pedia has offered any pointers to use, and no-one here has seen it, so I'm deleting this as RFV-failed. - -sche (discuss) 17:51, 9 March 2015 (UTC)