I would like to use a "bold style" for the fraction line in a math formula. I've seen it in some PDFs, but I do not know the proper command.
When I use Math.SE, and I type a equation such as: I get this continuous line. Is there a way to avoid this?
I'm trying to display some axioms and operational rules with LaTeX. Those are basically . They work quite well when used with frac, but it's not really nice, I'd like the fraction line to be a bit ...