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1912 Science 7 June 880/1 These triplets are often called Pythagorean numbers.]

1925 G. D. Birkhoff Origin, Nature, & Infl. Relativity 102 Imagine a clock traveling as fast as light. The Pythagorean rule shows that the corresponding Pythagorean triplet is 1, 0, 1. Hence, contraction of measuring sticks to nil and a complete stopping of clocks takes place in motion with the velocity of light.

1989 Math. Mag. 62 342 Some of these [sc. diophantine equations]..have no nontrivial solutions; whereas others, such as x² + y² = z² (Pythagorean triplets)..have an infinite number of integral solutions.