1. Archimedes: a great ancient Greek philosopher, encyclopedic scientist, mathematician, physicist and mechanic, the founder of statics and hydrostatics, enjoying the reputation of "the father of mechanics". Archimedes, Gauss and Newton are tied as the three greatest mathematicians in the world.
Thales, an ancient Greek thinker, scientist and philosopher, was born in Mile, the capital of Ionia, and founded the earliest school of philosophy in ancient Greece-Miletus School (also known as Ionian School).
3. Pythagoras: Ancient Greek mathematician and philosopher. Pythagoras was born in a noble family on Samos Island (an island in eastern Greece today) in the Aegean Sea. He was smart and studious since childhood, and studied geometry, natural science and philosophy with famous teachers.
4. Euclid: Ancient Greek mathematician. He was active in Alexandria in Ptolemy I Soter's time and was called "the father of geometry". His most famous book, The Elements of Geometry, is the foundation of European mathematics, and puts forward five postulates, Euclidean Geometry, which is widely regarded as the most successful textbook in history. Euclid also wrote some works about perspective, conic curve, spherical geometry and number theory.
Diophantine: an important scholar and mathematician in the later period of Alexandria in ancient Greece. Diophantine was one of the founders of algebra and had a deep study of arithmetic theory. He completely broke away from the geometric form and was unique in Greek mathematics.