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  4. Bertrand Russell
  5. ... mathematical knowledge ... is, in fact, merely verbal...

... mathematical knowledge ... is, in fact, merely verbal knowledge. "3" means "2+1", and "4" means "3+1". Hence it follows (though the proof is long) that "4" means the same as "2+2". Thus mathematical knowledge ceases to be mysterious.

Bertrand Russell
Mean, Numbers, Long
... mathematical knowledge ... is, in fact, merely verbal knowledge. 3 means 2+1, and 4 means 3+1. Hence it follows (though the proof is long) that 4 means the same as 2+2. Thus mathematical knowledge ceases to be