The pythagorean triples like (3, 4, 5), (5, 12, 13), etc. all follow a nice pattern which complex numbers expose in a beautiful way.
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Regarding the brief reference to Fermats Last Theorem, what should be emphasized is that it refers to *positive* integers. You can of course have things like 0^3 2^3 = 2^3, or (-3)^3 3^3 = 0^3.

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