- Contributions to the discovery of a Pythagorean spin. (Pythagoras)
- create a multiplication table or the Pythagorean school year (Table Pythagorean)
- the theory that geometry. "In any right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the legs"
- the properties of light and visual objects
- properties of sound.
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