Re: Turned Capital letter L (pointing to the left, with serifs)

From: Frédéric Grosshans <>
Date: Mon, 04 Jan 2016 21:33:45 +0000

I looked all the pages of the 1809 edition of _Theoria motus corporum
coelestium in sectionibus conicis solem ambientium_ where Gauss used this
notation in pages 80-81. Almost all notations are standard enough to be
familiar to any modern (2015) mathematician or physicist, with two
exceptions : this "7" symbol and ☊ U+260A ASCENDING NODE (which is still
standard in astronomy). The Greek letters in particular have a pretty
standard shape, and I don't see why this symbol would be the only geek
letter using a fancy cursive shape. Even the Latin letters used standard
shapes ( italic, roman, a few capital fraktur).

That said, I did not spot a tau in the text, while most of the Greek
alphabet was used. Could "7" be a standard shape for tau in 1809 Hamburg ?

However, I still think it is a ⦢ U+29A2 TURNED ANGLE


Le lun 4 janv. 2016 21:38, Raymond Mercier <> a
écrit :

> On further reflection I can well agree that it is tau. The attached images
> from R. Barbour, Greek Literary Hands, show clearly (scan 3) the large
> upper case tau in several lines, and in scan 4 in the first and other lines
> a hooked version of tau. So I withdraw my suggestion of pi.
> Raymond
> *From:* Asmus Freytag (t) <>
> *Sent:* Monday, January 04, 2016 7:58 PM
> *To:*
> *Subject:* Re: Turned Capital letter L (pointing to the left, with serifs)
> On 1/4/2016 10:41 AM, Michael Everson wrote:
> Certainly it does look more like a very common variant of “tau” than “pi”
> Variant of uppercase tau?
> A./
Received on Mon Jan 04 2016 - 15:35:02 CST

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