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Why 2+2=4 and not 5?

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I round the Humanities, so the answer is very simple: at least because the sum of two even numbers the result may not give an odd result. In theory, of course, possible numbers to give other definitions. Yes there is. Even the functions of addition, subtraction, multiplication and division can give different definitions. But it will lead to a massive revision of the existing system, which(the review), in essence, nothing will change. The essence will remain the same, changes only the characters. That would make sense in any form. With the same success we can name the meter with the word "bread." Distance will not change, but it will be extra work.
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