You Don't Know What A Number Is
27,013What exactly is a number? And don't tell me "5" or "7". Yes, those are numbers, but what is 5? 5 times the unit? You said 5 again! You still haven't explained to me what 5 is and you also have to explain to me what the unit is, the one. It seems terribly intuitive and yet, if someone came from another planet, they wouldn't be able to explain it to them. And I suspect you wouldn't either. This question takes us to the foundation of mathematics. Let's see it!
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