"Primality" is a weird word. I don't think I've heard it before.
Since GCD(7,9) = 1, does that mean that both a and b are relatively prime? Or are they relatively prime to each other? The latter makes far more sense, as 9 is not prime. Is relative primality unrelated to normal primality? Just wanted to double check. I wonder what good a definition dependent on a relationship to another number will do.
This section was pretty cool. Does this count as number theory?
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