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by tryeng
5078 days ago
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I don't believe it is a poor justification. It is a name chosen for this particular set of numbers. In fact, every name we've put on things in mathematics is "by definition". Real numbers, pi, odd numbers, perfect numbers. Someone found that particular definition useful, and others continued to use it. In the case of prime numbers I believe you cited one of the best reasons of leaving 1 out of the set. If someone needs a name for "the number one and all prime numbers", they can define it. |
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