Dividing by zero, zero divided by zero and zero to the power of zero – all pose problems! Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile This video features Matt Parker and James Grime – https://twitter.com/standupmaths and https://twitter.com/jamesgrime Videos by Brady Haran A run-down of Brady's channels: http://periodicvideos.blogspot.co.uk/2012/06/here-are-my-channels.html