14 Jan
2015
14 Jan
'15
9:56 p.m.
The difference between [-inf, inf] and [-inf, -1] U [1, inf] is that in last case value cannot have value in range (-1, 1). That is why [-inf, inf] is not correct result (that is what is returned in fact). That is why [-inf, -1] also is not correct (that is what have to be returned according documentation). Hmmm...