Why don't we define “imaginary” numbers for every “impossibility”? (2012)(math.stackexchange.com)98 points by curling_grad 3 years ago | 74 comments
Does there exist a complete implementation of the Risch algorithm?(mathoverflow.net)141 points by thechao 3 years ago | 21 comments
Is infinity an odd or even number? (2011)(math.stackexchange.com)192 points by layer8 3 years ago | 333 comments
Widely accepted mathematical results that were later shown to be wrong? (2010)(mathoverflow.net)92 points by belter 3 years ago | 32 comments
Why is the volume of a cone one third of the volume of a cylinder? (2010)(math.stackexchange.com)206 points by eigenvalue 3 years ago | 109 comments
