Hi, not sure if this is the right forum.. pls move if not. Almost 30 years ago, I was studying engineering and my math tutor spoke about 0 (zero) being special. We talked about how nothing can be divided by zero, and sure enough, enter 1/0 into a calculator produces an error. (I vaguely recall learning this in high school). Something occurred to me and I asked him about it. Here's the steps I put in front of him: 0/0 = 1 0/1 = 0 1/1 = 1 1/0= error But 1/0 x 0/1 = 1 I asked, how can this be. He could not give me an answer. I've asked a few math teachers since then and none could give me an answer. Is it simply a matter of convention, or is something else going on?