Fermat's right triangle theorem is, by the Pythagorean theorem, they would form two integer-sided right triangles in which the pair formula_10 gives one leg and the hypotenuse of the smaller triangle and the same pair also forms the two legs of the larger triangle. But if (as Fibonacci asserted) no square congruum can exist, then there can be no two integer right triangles that share two sides in this way. Because the congrua are exactly the numbers that are four times the area of a Pythagorean triangle, and multiplication by four does not change whether a number is square, the existence of a square
Parisa (given name) Parisa (given name) Parisā () (pronounced pə-REE-sa) is a Persian given name for girls that means 'like a fairy'. The ancient Persian name "Parysatis" () is related to this name. Two notable women with the name "Parysatis" are: Parysatis, who was the wife of Darius II (), ("Dārayavahuš"), king of the Persian Empire and Parysatis II, the youngest daughter of Artaxerxes III of Persia, who was the wife of Alexander the Great. "Pari" can be used as a diminutive of Parisa. Pari () (pronounced pər-REE) means "fairy" and is used as a name of its own right as well. Pari