PPT Slide
Ancient & Medieval Philosophy -- David L. Rouse
- He probably discovered that the chief musical intervals are expressible in simple numerical ratios between the first four integers [octave=2:1, fifth=3:2, fourth=4:3].
- Finally, he may have discovered the theorem that bears his name, that the square on the hypotenuse of a right-angled triangle is equal to the sum of the squares on the sides enclosing the right angle.