From: Frédéric WANG <fred.wang@free.fr>

Date: Fri, 12 Mar 2010 17:52:22 +0100

Message-ID: <4B9A7146.7080500@free.fr>

To: "www-math@w3.org" <www-math@w3.org>

Date: Fri, 12 Mar 2010 17:52:22 +0100

Message-ID: <4B9A7146.7080500@free.fr>

To: "www-math@w3.org" <www-math@w3.org>

I'm still not sure what is the correct rendering for madruwb... Since the "right angle" notation seems common, I guess it is reasonable to implement it as the equivalent of "right bottom"? > Hello, > > While discussing with Azzeddine Lazrek about the madruwb notation, he > told me that there are several variants for drawing the symbol: > > - The one given in the MathML 3 spec is with a lam letter: > http://www.w3.org/TR/MathML3/image/madruwb12.png > - However, it seems that a "right angle" is also common: > http://upload.wikimedia.org/wikipedia/en/9/95/Arabic_mathematical_factorial.PNG > > - Apparently, the "right angle" can also be oriented the other > direction. Azzedine mentioned “Florian Cajori, A History of > mathematical notations, Vol. 2” , p. 74 (notation used in 1827). > > I wonder whether the direction of the right angle depends on the > "overall directionality" of formulas... Also, I'm not sure whether > these right angle notations are exactly equivalent to "right bottom" > and "left bottom". Maybe some arabic people can tell us more about > these variants of madruwb and whether it would be interesting to add > new values for the "notation" attribute of menclose... > > Frédéric WangReceived on Friday, 12 March 2010 16:49:55 UTC

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