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Trying to read Lamaitres 1948 paper on Quaternions, in reply to Klein's Verlangen program, but can not find a translation of term Verseurs, which is even a section heading:

"Un quaternion dont la norme est egale a un s'apelle un verseur, Le produit de deux verseurs est un verseur."

Anyone know what verseur translates to?

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    $\begingroup$ Verlangen program? $\endgroup$
    – Igor Rivin
    Commented Aug 15, 2016 at 22:54
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    $\begingroup$ Well, a verseur is a quaternion whose norm is $1$, do we really need to know more? $\endgroup$
    – Christian Remling
    Commented Aug 15, 2016 at 22:57
  • $\begingroup$ [Echoing @ChristianRemling's comment...] $\endgroup$
    – paul garrett
    Commented Aug 15, 2016 at 22:57
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    $\begingroup$ So, the English translation is "versor". Or maybe the other way around? "versor" in English was translated to "verseur" in French. $\endgroup$
    – Gerald Edgar
    Commented Aug 15, 2016 at 23:50
  • $\begingroup$ Klein's program was published in Erlangen, maybe inspired by "ein großes Verlangen" to push things further... $\endgroup$
    – Wolfgang
    Commented Aug 16, 2016 at 8:23

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See the enlightening Wikipeda article on versors (which include etymology).

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  • $\begingroup$ Very good... but/and "wikiwand.com", not "wikipedia.org" FWIW. $\endgroup$
    – paul garrett
    Commented Aug 15, 2016 at 22:59
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    $\begingroup$ @paulgarrett it's a nicer front end. $\endgroup$
    – Igor Rivin
    Commented Aug 15, 2016 at 23:33
  • $\begingroup$ Ah, indeed, I didn't know! :) $\endgroup$
    – paul garrett
    Commented Aug 15, 2016 at 23:37

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