Veda Veda, F (Viete, Francoic) was born in the Poitou region of France in 1540 [Poitou, Fontenay.-le-Comte (Fontenay.-le-Comte) in the Vendée Province today] ; Died in Paris on December 13, 1603. Veda was the most influential French mathematician in the sixteenth century. His main achievements include: Plane Trigonometry and Spherical Trigonometry "Mathematical Laws Applied to Triangles" is one of Veda's earliest mathematical monographs and one of the early works that systematically discusses plane and spherical trigonometry. Veda also wrote a special paper "Truncation", which initially discussed the general formulas of sine, cosine and tangent, and applied algebraic transformation to trigonometry for the first time. He considered equations containing multiple angles, specifically gave the function that would be expressed as, and gave the expression for multiple angles when n is equal to any positive integer. Symbolic Algebra and Equation Theory "Introduction to Analytical Methods" is Veda's most important algebra work and the earliest monograph on symbolic algebra. Chapter 1 of the book uses two Greek documents: Papos's "Mathematical Collection" No. 7 and Dius Combining the problem-solving steps in Fantu's works, he believed that algebra was a logical analysis technique that used known results to find conditions, and believed that Greek mathematicians had already applied this analysis technique. He just reorganized this analysis method. . Veda was not satisfied with Diophantus' idea of ??using a special solution to every problem, and tried to create a general symbolic algebra. He introduced letters to represent quantities, using consonants B, C, D, etc. to represent known quantities, using vowels A (later used N), etc. to represent unknown quantities x, and using Aquadratus, Acubus, and this kind of algebra This "type of operation" is called this to distinguish it from the "number operations" used to determine numbers. When Veda proposed the difference between the operations of classes and the operations of numbers, he had already defined the boundary between algebra and arithmetic. In this way, algebra became the study of general classes and equations. This innovation was considered an important progress in the history of mathematics. It opened the way for the development of algebra. Therefore, Veda was called the "Father of Algebra" in the West. In 1593, Veda published another algebra monograph - "Five Parts on Analysis" (5 volumes, completed around 1591); "On the Identification and Correction of Equations" was written by his friend A. Anderson published it in Paris, but it had been completed as early as 1591. Among them, a series of formulas related to equation transformation are obtained, and G. Cardano's cubic equation and L. Improved solution formula of Ferrari's quartic equation. Another achievement was the recording of the famous Vedic theorem, which is the relationship between the roots and coefficients of an equation. Veda also discussed the problem of numerical solutions to algebraic equations. An outline was prepared in 1591 and published in 1600 under the title "Numerical Solution of Powers". Contribution of geometry In 1593 Veda explained in the Five Analyzes how to use rulers and compasses to solve geometric problems leading to certain quadratic equations. In the same year, his "Supplementumgeometriae" was published in Tours, which gave some knowledge of algebraic equations involved in the problem of ruler and compass construction. In addition, Veda was the first to clearly give the infinite calculation formula for the value of pi, and created a set of decimal fraction representations, which promoted the reform of notation. Later, Veda's idea of ??using algebraic methods to solve geometric problems was inherited by Descartes and developed into analytic geometry.