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1= 1 in mathematics, right? How to prove 1+ 1=3?
Mathematically, 1 is equal to 1, which is certain, but proving 1=2, 1=3, 2=3 seems to prove that the process is correct, but in fact it is not established. 1 equals 1 and will never be equal to 2 or 3. In fact, these proofs are a test of human thinking.