Guy Terjanian is a French mathematician who has worked on algebraic number theory.
He achieved his Ph.D. under Claude Chevalley in 1970,[1] and at that time published a counterexample[2] to the original form of a conjecture of Emil Artin, which suitably modified had just been proved as the Ax-Kochen theorem.
In 1977, he proved that if p is an odd prime number, and the natural numbers x, y and z satisfy
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