User blog comment:Vel!/Division by zero/@comment-5929355-20130508073858/@comment-25418284-20130509011437

Huh? If we assume that "inf" can be manipulated like any real number, inf - (inf - n) = inf - inf + n = n, so n/0 = n...

Division a/b is simply not defined for b = 0. It's not even infinity, it's just not defined. The domain of 1/x is ℝ \ {0}.