Now that he was blind it was difficult for him. He would have multiple people help him. These multiple of people included his sons Johann Euler and Christoph Euler. This also included the members of the Academy in St. Petersburg W.L Krafft, A.J. Lexell, and N. Fuss. Throughout trials and tribulations, he still has made some of the most important mathematical discoveries in the world of math. On September 18, 1753, Leonhard Euler died in St. Petersburg, Russia. The day started out very normal for him. He would give his grandchildren math lessons. He was doing calculations and studying the planet Uranus with his sons. Later on in the afternoon, he had a type of stroke called a brain hemorrhage. He died at 11 P.M at the age of 76. His work and strength will always be remembered. He has become one of the greatest mathematicians of all time. He had his own techniques of studying and discovering different things. and Gottfried Wilhelm von Leibniz. He made discoveries in the basis of different parts of math. He made contributions in areas of math such as calculus, trigonometry, geometry, algebra, and physics. He came up with theories and formulas for these …show more content…
He gave the world a better understanding of logarithms. He showed how logarithms could be applied to complex and negative numbers. He also discovered how to use it in power series. Leonhard Euler had also invented the gamma function and gave a different way to solve quartic equations. He helped the develop analysis by finding a technique to solve integrals with complex limits. Leonhard Euler proved Pierre de Fermat’s theorem on the sums of two squares and Isaac Newton’s identities. The theorem’s name has been changed to Euler’s theorem because he was able to prove it. He also came up with the graph theory. He related the vertices, faces, and edges of a convex polyhedron with the constant of the graph theory. He had always been able to solve real- life problems. He was the first person to combine Gottfried Wilhelm von Leibniz’s differential calculus and Isaac’s Newton’s method of fluxions. This formed mathematical analysis. He had also came up with the law of biquadratic and the prime number theorem in the process. He invented the Euler- Maclaurin formula and Euler’s method. He found the constant in the Euler- Maclaurin formula. He made the tools that were made to make applying calculus easier. He studied the theory of perfect numbers and gave the world a better