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
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