Le 27/07/2016 à 03:12, Robert Wheelock a écrit :
How do Arabs, Iranians, Afghans, Pakistanis, Urdu ... all write their equivalents of common numerical fractions (consisting of a numerator, a separator character, and a denominator)?!?! Considering that Arabic written script reads from right to left (like in Hebrew, Syro-Aramaic, and the fantasy language of Tsolyáni), would they use a normal right-facing foreslash (1/2), a left-facing backslash (1\2), or do they align numerator above|demoniator below a horizontal fraction bar?!?! Notice that these people would use the native Arabic-based digits in them; nonewithstanding, the forms for |4 5 6| (and—sometimes—those for |2 7|) do look quite different from the canonical Arabic forms.
The subject of modern arabic notation is quite complex, mixing RTL and LTR consideration, as well as latin/arabic/greek/math mixing, with several different approaches. A W3C document on this (https://www.w3.org/TR/arabic-math/) enumerates 4 styles (Moroccan/Maghreb/Machrek/Persian). It also contains the following paragraph, which answers your question:
Finally, although stacked fractions are rendered the same way in both European and Arabic, bevelled fractions in RTL Arabic will appear, as one would expect, with the terms in RTL order, i.e. A divided by B would appear as "B/A". In some locales, the preference is for the slash to also be mirrored, as "B\A". For these cases, we suggest that authors employ explicit markup using the REVERSE SOLIDUS \ Frédéric
