The French army intercepted some secret letters in Spain, but people saw gobbledygook-like symbols, and no one could understand them. French King Henry IV turned to Franciscus Vieta, a famous national activist and lawyer, for help. David was famous then. He is an amateur mathematician. Veda deciphered a very important Spanish information with algebraic knowledge, and the French army saved the day. Within two years, Spain was defeated.
The inquisition in Spain believes that the Vedas have practiced witchcraft and that they have betrayed God and will be burned at the stake. But Veda is in France, the victorious country, and Spain can't help him.
David spends all his spare time studying mathematics. Sometimes he can stay up for days to solve a problem. It is said that David also won honor for his country with his exquisite mathematical knowledge.
At that time, there was a mathematician named Romenius in Belgium. He is also respected by the people and the king is very proud. A Belgian envoy once boasted to the French king, "No mathematician in your country can solve a problem about the 45th equation of China mathematician Romenius." This problem was put forward by Romeno in 1573' s book Mathematical Thought.
The king of France ordered domestic mathematicians to solve this problem, but after a long time, no one reported the result, and the king was very unhappy. One day, Vader talked with the king. The king mentioned this and showed the equation to Wada. As a result, Wada found the answer in minutes. The king boasted happily, "David is the greatest mathematician in China and even in the world." Veda was rewarded with 500 francs on the spot.
159 1 year, David published an introduction to analytical methods. In this book, David not only uses letters to represent unknowns, but also uses letters to represent various coefficients in equations, and develops a unified method to understand quadratic, cubic and quartic equations and various transformations of roots. This is the first symbolic algebra in human history, which clearly distinguishes between "class arithmetic" and "number arithmetic" and divides the boundary between algebra and arithmetic, so people call David "the father of algebra".
David often uses method of substitution to solve equations. He only admits that the equation has positive roots, so he can't fully understand all the solutions of the equation. His solution is close to the relationship between the roots and coefficients of a quadratic equation with one variable. In memory of him, people call the relationship between roots and coefficients "Vieta Theorem".
The Vedas were born in Fontenet on 1540. His real name is Francis Weffort. Veda is his Latin name. David wrote many works before his death, but most of them were not published. He was the first to put forward the summation formula of infinite proportional series by using geometric elements, and discovered tangent law, sine difference formula, cosine theorem of pure angular triangle and so on.
Descartes, the great mathematician, said, "I inherited the Vedic cause."