Thales was the first person who made great contribution to the birth of mathematics. He used the shadow of the sun to calculate the height of the pyramid, actually using the nature of similar triangles, which was very remarkable at that time.
After Thales, a group of scholars led by Pythagoras made contributions to mathematics. Their most outstanding achievement is the discovery of Pythagorean Theorem, which is called Pythagorean Theorem in the West. It was this theorem that led to the discovery of irrational numbers and the first mathematical crisis. Zhi Nuo, who was later than Pythagoras, put forward four famous paradoxes, which had an important influence on the development of mathematical concepts in the future. Euclid absorbed the essence of predecessors and wrote the mathematical work "Elements of Geometry". Everything people have learned about plane geometry today comes from this book. After Euclid, Archimedes initiated a new era of Greek mathematics and was called "the God of Mathematics" by later generations.
After Archimedes, under the impetus of astronomy, Hipacha, Ptolemy and others founded trigonometry. Nicole Matthews wrote the first classic book of number theory-Introduction to Arithmetic. Diophantine systematically studies various equations.
In this way, elementary mathematics was established. This means that the mathematical "baby" conceived by ancient Babylon and ancient Egyptians was finally born in the cradle of ancient Greece.