## More on Diophantus and Fermat

In a previous
post I
wrote about how Fermat scribbled his famous “last theorem” in the margin
of Diophantus’ *Arithmetica*. This is called Fermat’s last theorem not
because it was the last thing Fermat wrote but because of all the
incomplete theorem’s we know were left by Fermat it was the last to be
proved, taking about 350 years.

The section of the book where Fermat wrote his comment was on finding
*Pythagorean triples*: square numbers whose sums also form squares. Such
numbers can be the sides of Pythagorean (right-angled) triangles, the
most well know being 3-4-5.