...P¹

Apparently, although I was unaware of this fact until recently, Jekuthiel Ginsburg was first to publish the method of finding the generating parameters for a given PPT by setting $\frac{c+a}{b}$ (reduced to lowest terms) equal to $\frac{m}{n}$ , see The Generators of a Pythagorean triangle, Scripta Math. 11 (1945), p. 188.

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... Roberts²

Joe Roberts, Elementary Number Theory : A Problem Oriented Approach, $2^{nd}$ Printing , [Cambridge, Massachusetts, The MIT Press, 1978]

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