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In https://en.wikipedia.org/wiki/Principia_Mathematica https://en.wikipedia.org/wiki/Principia_Mathematica the conclusion that 1+1=2 appears only at page 379. I
by reacweb 8y ago
In https://en.wikipedia.org/wiki/Principia_Mathematica https://en.wikipedia.org/wiki/Principia_Mathematica the conclusion that 1+1=2 appears only at page 379. It was a hard proof ;-)
- taejo 8y agoThat's only true if you take a pretty arcane definition of 1 and 2, BTW. In modern axiomatizations of mathematics, as well as Peano's 19th-century axiomatization of arithmetic, the definitions of 1 and 2 are simpler, and the proofs that 1+1=2 take a couple lines.