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MrHen comments on Bizarre Illusions - Less Wrong
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How do you see 0 or -1, using this definition?
A factor of a number M is a number that evenly divides M with no remainder. Zero has infinitely many factors, definitely not prime.
...regarding -1, I can't think of anything relevant that I know about the relationship between negative numbers and prime numbers.
Later edit: Then I completely changed my mind... and decided 0 and -1 should be prime relative to how I would define it's essence. I note that you intuited what I really meant by prime better than I did!
Yeah, I was just curious. I like toying around with the fundamentals behind the maths and seeing what happens. :)