Quote:

Originally Posted by **Trico** Why take it, then?
Anyway, that is the *longest* proof that 2+2=4; I don't know how long the shortest proof is, but I imagine it's quite manageable. |

Aren't the first few hundred pages of the Principia Mathematica dedicated to proving that 1+1=2?

Proving it from basics is...not easy.

Quote:

Originally Posted by **Sailboat** Why can't you just count on your fingers or something. |

Because how do you know that one finger plus one more finger is two fingers? Why isn't it three? Or twelve? Or none?

Of course, my (exceptionally limited) understanding of this is that, despite such proofs, other proofs have popped up showing that it is impossible to prove something as basic as 1+1=2, but I could be mistaken on this point.