Fifth Axiom (extra footage) - Numberphile

Some extra footage not used in our Fifth Axiom video with Dr Caleb Ashley. Main video:    • Ditching the Fifth Axiom - Numberphile   http://bit.ly/HyperbolicGeometry NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook:   / numberphile   Numberphile tweets:   / numberphile   Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile Videos by Brady Haran Support us on Patreon:   / numberphile   Brady's videos subreddit:   / bradyharan   A run-down of Brady's channels: http://www.bradyharan.com Sign up for (occasional) emails: http://eepurl.com/YdjL9