| http://www.w3.org/ns/prov#value | - As you recall, we denoted by Z[???n] the set of numbers of the form a+b???n, where a and b are integers, and n is a positive integer he is not a perfect square. (Z[???n] is in fact a ring, as we will define the term in a moment.)Within that set, consider the subset of numbers such that the equation a2 - nb2 = ??1 holds.
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