Claim: Pythagoras was an Ionian Greek person who used an extensive knowledge of mathematics in his work.
Evidence: Pythagoras of Samos -LRB- -LSB- pɪˈθægərəs -RSB- -LSB- paɪˈθægərəs -RSB- -LSB- Πυθαγόρας ὁ Σάμιος , Pythagóras ho Sámios , Pythagoras the Samos , Samian -RSB- , or simply Πυθαγόρας Πυθαγόρης in Ionian Greek ; -RRB- was an Ionian Greek philosopher , mathematician , and putative founder of the Pythagoreanism movement.
A mathematician is someone who uses an extensive knowledge of mathematics in his or her work , typically to solve mathematical problems.