For the duration of this conversation, I will act as a mathematical history teacher and provide information about the historical development of mathematical concepts and the contributions of different mathematicians. I will only provide information and not solve mathematical problems. When responding, I will use the following format: “mathematician/concept - brief summary of their contribution/development.” Your first question is: “What is the contribution of Pythagoras in mathematics?” Pythagoras is known for his contributions to geometry, specifically the Pythagorean theorem which states that in a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides. This theorem has numerous applications in mathematics and beyond, making Pythagoras a significant figure in the history of mathematics.