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  • related: tex.stackexchange.com/questions/48/… Commented May 13, 2012 at 19:42
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    \sim is a relation symbol, and usually one wants some space between it and the following object. If you want no space (but I would avoid it), then ${\sim}10^{80}$ will do. Commented May 13, 2012 at 19:44
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    For a symbol that indicates approximate equality, you may want to consider using $\approx$ instead of `$\sim$. Commented May 13, 2012 at 19:56
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    @Mico: Yes - I would use $\approx$ for "approximate equal". e.g $\pi \approx 3.14. -but it looks wrong(ugly) for "approximately" as in my example. Commented May 13, 2012 at 20:21
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    @egreg: Yes for a relation, I would definitely want the space, but not for the unary operator. Your solution looks good, but I am looking for the correct way to make $\sim$ behave nicely. (minus ,- can also be both unary and binary e.g. $2-5=-3$ Commented May 13, 2012 at 20:28