How did Pythagoras leave an impact?

Pythagoras, an influential ancient Greek mathematician and philosopher, left a lasting impact primarily through his contributions to mathematics, particularly the Pythagorean theorem, which relates the lengths of the sides of right triangles. His teachings emphasized the importance of numbers and their relationships, laying foundational concepts for mathematics and influencing later developments in geometry. Additionally, Pythagoras and his followers promoted philosophical ideas about the harmony of the universe, intertwining mathematics with music and cosmology, which shaped Western thought for centuries.