On 10/04/2018 21:36, wrote:
ARW wrote:
Anyone else agree that the answer is four and not 4?

For those interested in the relevant mathematical philosophy
behind such questions, you might try:

http://www.gutenberg.org/ebooks/41654

Mind you, even the definition of 1 (one) is pretty hard going :-)

You will need to get a copy of his /Principia Mathematica/ for his
attempt to prove that 1+1=2, never mind 2+2.

--
Max Demian