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["El.Douwen" <address@hidden>]

>> hi
>> i had asked for the writing of AB and Marc suggested to write A[space]B so 
>> that the italic of A be the same than i the other parts of the document.
>> for the little letters i have always written a*b and the * is invisible. 
>> Typing a space b gives the same result but is quite shorter and easier to 
>> do
>> is there a typographic reason to prefer the use of * than the use of space 
>> or is it ok ?
>> Sacha
> 
> * means multiply (as in '2*x')
> space means 'apply', that is, function application (as in 'sin x')
> 
> You may not (want to) follow these conventions,
> but this will make your formulas semantically incorrect
> (e.g. if you would copy and paste them in a computer algebra session,
> then they won't be interpreted in the intended way).

that is exactly the answer i was waiting for
i will systematically write wiht* for multiply and space for apply
thank joris

i write you in private for something else

Sacha