Posted: Oct 21, 2016 3:22 pm
When I was taught these things, Pythagoras did not apply on the Poincaré disk. Since 1999, however, it appears otherwise: https://www.jstor.org/stable/2589022?se ... b_contents
Lifeboat for the rational mind :D
http://www.rationalskepticism.org/
http://www.rationalskepticism.org/viewtopic.php?p=2486002#p2486002