The set of integers is the main object of study in this section. We use many results from previous sections to derive properties of integers. Recall that is a PID and hence a UFD.

The notions of divisibility, prime and relatively prime integers, gcd and lcm of integers are essentially the same as discussed in connection with a PID or a UFD. We avoid repeating the definitions here, but concentrate on other useful properties of integers, not covered so far. We only mention that whenever we talk about a prime integer, ...

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