Summing up why Hamming's error correcting codes are regarded as 'Perfect' - Professor Brailsford explains. EXTRA BITS: https://www.youtube.com/watch?v=i4zC67Yf5Iw For more background on this: https://www.youtube.com/watch?v=1_X-7BgHbE0 http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com/