claim: Pythagoras was an Ionian Greek person who used an extensive knowledge of mathematics in his work.
evidence: A mathematician is someone who uses an extensive knowledge of mathematics in his or her work , typically to solve mathematical problems .. mathematics. mathematics. Mathematics is concerned with numbers , data , quantity , structure , space , models , and change .. data. data. quantity. quantity. structure. mathematical structure. space. space. models. Mathematical model. change. mathematics#Change