Someone wants to know what the difference between +0 and −0 is.

You explain that there is no difference between +0 (which can be simply written as 0) and −0: In algebra, −xis defined to be the numberysuch thatx+y= 0; since 0 + 0 = 0, it follows that −0 = 0.

But the person insists that +0 and −0 are different and even links you to the Wikipedia article on one-sided limit to try and prove you wrong. He claims (without a clue what the notation mean) that because and mean different things, therefore +0 and −0 must be different.

How would you feel? How I am now feeling is what. Because this just happened to me on another forum.