https://en.wikipedia.org/wiki/Signed_zero https://en.wikipedia.org/wiki/Signed_zero for the CS version. This is common in maths when you approach a number 0 in

https://en.wikipedia.org/wiki/Signed_zero https://en.wikipedia.org/wiki/Signed_zero for the CS version. This is common in maths when you approach a number 0 in this case) from either side. Your results may be dramatically different, such as "what happens when you approach 0 for f(x) = 1/x"