Ok, after reading this, this, and the beginning of this I've realised there seems to be a consensus that 0/0= indeterminate. Now, today my friend who's a math person has come up with this 'theory' that 0/0=1. She presented two arguments to support her theory, first she said that 0!/0! = 1, then she said that anything divided by itself = 1, (x/x=1), I think she's full of crap, but I'm at a bit of a loss, so can you guys help me prove her wrong (or help me understand why she's right). I already tried arguing my basic understanding of the issue, but she won't give in.