Jan Willem, I think a mixed-fraction symbol would be very useful and meaning-ful. But invisibletimes and invisibleplus really are not semantic-ful- enough to my taste.
or? paul PS: in activemath we have internal symbols for mixed fractions, not surprisingly. PPS: check MathML3, I vaguely remember it has a mixed-fraction concept at the core... or at least it was discussed. Le 31-août-09 à 14:23, Jan Willem Knopper a écrit : > Dear all, > > Is there a way to describe in OpenMath that a certain times or plus > symbol is invisible ? > > For invisible times this would be something like 2a or 2(x+1) and for > invisible plus I'm thinking about 1 1/2 (= 3/2). > > A lot of this has to do with presentation, but one might also argue > that > numbers like 1+1/2 and 1 1/2 have different semantic meaning in > primary > or highschool, where the integer part is written in front of the > fraction, > rather than writing 3/2. > > Furthermore, for invisible plus, the use of the symbol would be > binary, with as the first argument a positive integer (or maybe a > variable) and as the second argument a fraction (of positive integers, > or maybe variables). > > In the MathDox Formula Editor I would like to let the user input > expressions with invisible times and invisible plus and it would be > nice > to be able to store the information that they are invisible > (especially > for invisible plus). > > Does anyone know how to describe expressions like 1 1/2 in OpenMath? > > Thanks in advance, > > Jan Willem > _______________________________________________ > Om mailing list > [email protected] > http://openmath.org/mailman/listinfo/om _______________________________________________ Om mailing list [email protected] http://openmath.org/mailman/listinfo/om
