Ditching the Fifth Axiom - Numberphile
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11:49
Fifth Axiom (extra footage) - Numberphile
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16:51
Euclid's Big Problem - Numberphile
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31:12
How One Line in the Oldest Math Text Hinted at Hidden Universes
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13:45
A Problem with the Parallel Postulate - Numberphile
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4:26
Illuminating hyperbolic geometry
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28:33
Terence Tao on how we measure the cosmos | Distance ladder part 1
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13:40
The Amazing Heptadecagon (17-gon) - Numberphile
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10:23