Antoine Leca wrote:

> [...] I think that the early mathematicians,
> particularly the Spanish ones, who adopted the Arab glyphs,
> were actually writing in Arabic! ;-)

BTW, a totally unrelated question: has any European language ever been
written in Arabic letters? Either when Arabs dominated Spain and Sicily or
(more recently) when Turks dominated the Balkans.

> > However, looking at the shape of some digits (e.g., "2" and
> > "3") I wondered
> > too whether these glyph had undergone 45 degree rotations
> [...]
>
> I would say, two 90 degree rotations, first clockwise, then
> contrary clockwise.

Yes, sorry, I meant 90 degrees, I don't know why I wrote 45. (Geometric
dyslexia?)

_ Marco