Guy Terjanian

Guy Terjanian is a French mathematician who has worked on algebraic number theory. He achieved his Ph.D. under Claude Chevalley in 1966, and at that time published a counterexample 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 formula_1, then "2p" must divide "x" or "y".