Works of Theon of Smyrna were strongly influenced by Pythagoras, the Greek philosopher and mathematician known for what?
Pythagoras Pythagoras of Samos ( ; ; Greek: Πυθαγόρας ὁ Σάμιος  "Pythagóras ho Sámios"  "Pythagoras the Samian" , or simply Πυθαγόρας ; Πυθαγόρης in Ionian Greek; 495 BC ) was an Ionian Greek philosopher, mathematician, and putative founder of the Pythagoreanism movement. He is often revered as a great mathematician and scientist and is best known for the Pythagorean theorem which bears his name.
Euclid's Elements The Elements (Ancient Greek: Στοιχεῖα "Stoicheia") is a mathematical treatise consisting of 13 books attributed to the ancient Greek mathematician Euclid in Alexandria, Ptolemaic Egypt c. 300 BC. It is a collection of definitions, postulates, propositions (theorems and constructions), and mathematical proofs of the propositions. The books cover plane and solid Euclidean geometry, elementary number theory, and incommensurable lines. "Elements" is the oldest extant large-scale deductive treatment of mathematics. It has proven instrumental in the development of logic and modern science, and its logical rigor was not surpassed until the 19th century.