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Problem 800: de Gua's Theorem, Pythagorean theorem in 3-D

Details: https://t.co/MIDNBStq5t

3 8
2016-06-10

New artwork for sale! - "Einstein\'s theorem ...." - https://t.co/X5bFrNXrOa

0 1
2016-01-30

"Life might be seen as a virus infecting the perfect organism of death."

28 25
2014-10-06