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[Henri Lesourd <address@hidden>]

el.douwen wrote:

> hi
> when i write "a" in mathematical mode, "a" is in italic
> when i write "b" also
> but when i want the product a by b, so i write "ab" then "ab" is not  
> in italic
> is it normal ?


Yes, in math mode, italics is for variables, and
variable names are supposed to be one-letter words.

This way, you write "sin x", and "x" is in italics,
while "sin" is not.