The mirroring of CLOCKWISE INTEGRAL in the Unicode Standard refers to
mirroring the S shape of the integral, but not to the little superimposed
circle with a clockwise arrow in it. Naturally, this little circle has to
remain clockwise when the integral's S shape is mirrored, since the circle
specifies the direction the integral is performed in the complex plane.
This plane is an abstract mathematical space that is unrelated to the
natural-language writing direction.
The point is probably academic, since contour integrals are part of analytic
function theory and hence are beyond Kindergarten-12 mathematics. I suspect
there are vanishingly small mathematical accounts that advanced in Arabic.
If anyone has such a treatise, I'd very much like to see and/or buy it.
Thanks
Murray
> -----Original Message-----
> From: Jonathan Coxhead [SMTP:jonathan@doves.demon.co.uk]
> Sent: Monday, July 12, 1999 4:14 PM
> To: Unicode List
> Subject: Erratum?
>
> I see CLOCKWISE INTEGRAL and 2 subsequent characters listed in the
> "mirrored" section of the Unicode Standard. I don't know a lot about
> right-to-left writing systems, and less about how mathematics is layed
> out within them, but isn't the notion of "clockwise" based on the
> direction of the sun, and so the same in all writing directions?
>
> Are these 3 characters there erroneously?
>
> And if there are there correctly, shouldn't COMBINING (ANTI-)
> CLOCKWISE RING OVERLAY and COMBINING (ANTI-) CLOCKWISE ARROW ABOVE be
> present as well?
>
> (Maybe it's just the "integral" part that should be mirrored: in
> that case, a note would clarify the intention.)
>
> /|
> o o o (_|/
> /|
> (_/
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