Principia mathematica should not be used as source book for any actual mathematics because it’s an outdated and flawed attempt at formalising mathematics.
Axiomatic set theory provides a better framework for elementary problems such as proving 1+1=2.
This guy would not be happy to learn about the 1+1=2 proof
One part of the 360 page proof in Principia Mathematica:
It’s not a 360 page proof, it just appears that many pages into the book. That’s the whole proof.
Principia mathematica should not be used as source book for any actual mathematics because it’s an outdated and flawed attempt at formalising mathematics.
Axiomatic set theory provides a better framework for elementary problems such as proving 1+1=2.