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In 1741 Frederick the Great of Prussia persuading Euler to leave Russia and asked to join the Academy of Sciences in Berlin. He lived in Berlin for twenty five years and returned to Russia in 1766. Shortly after that his eyes could not see anymore. Even in the stricken state of this kind, it is not stopping the investigation. Euler has a spectacular ability in mental arithmetic, and until he died (in 1783 at St. Petersburg - now called Leningrad - at the age of seventy-six years), he continued to issue high-grade paper in mathematics. Euler married twice and had thirteen children, eight of whom died young.

All Euler discovery could have been made man even if he had never lived in this world. Although I think, appropriate criteria are used in this problem is to ask the questions: what will happen in the modern world if he had not done anything? In connection with Leonhard Euler answer seems clear: modern science and technology will be far behind, almost inconceivable, in the absence of the Euler formula, formulas, and methods. Index glance glance mathematics and physics textbook will show these explanations Euler angle (hard object motion); stability Euler (infinite series); equilibrium Euler (hydro-dynamics); equilibrium Euler motion (dynamics of hard objects); Euler formula (a complex variable ); summation Euler (boundless barrage), Eurel polygonal curve (differential balance); opinion about diversity Euler function (partial differential balance); transformation Euler (infinite barrage); law Bernoulli-Euler (elastisitis theory); formula Euler- Fourier (trigonometric series); equilibrium Euler-Lagrange (calculus of variations, mechanics), and Euler-Maclaurin formula (summation method) was all about some of the essentials.

The results of mathematical and scientific Euler truly absurd. He wrote 32 books complete, much of which consists of two volumes, several hundred articles about math and science. People say, a collection of scientific writings consist of over 70 volumes! The genius of Euler enrich nearly every aspect of pure mathematics and mathematical ready-made, and its contribution to mathematical physics is almost no limit to use.

Euler specialized experts demonstrate how the general laws of mechanics, which have been formulated in the previous century by Isaac Newton, can be used in certain types of physical situations that occur repeatedly. For example, using Newton's laws of motion in the fluid, the Euler equations can develop hydro-dynamics. Also, through a careful analysis of the possibility of the muscular movement of goods, and with the use of the principles of Newton. And Euler enabled to develop a number of opinions that completely determine the motion of stout stuff. In practice, of course, the object of objects is not always necessarily muscular. Therefore, Euler also made important contributions on the theory of elasticity describes how a solid can change shape through the use of external power.
Euler also used his talents in the mathematical analysis of problems of astronomy, specifically concerned about the "three-body" which deals with the issue of how the sun, earth and moon move under gravity they each are the same. This problem - a problem that so thinking for the 21st century - has not been fully resolved. Incidentally, only Euler leading scientists of the 18th century who (correctly, as later proved) to support the wave theory of light.

Euler ideas that poured endlessly is often the starting point for generating mathematical discoveries that can make someone famous. For example, Joseph Louis Lagrange, the French mathematical physicist, succeeded in formulating a series of formulas ("Lagrange formula") which has an important theoretical significance and can be used to solve various problems of mechanics. Basically the formula discovered by Euler, as it is often called the Euler-Lagrange formula. Another French mathematician Jean Baptiste Fourier, is generally credited with the invention of mathematical techniques, known by the nickname Fourier analysis. Here, too, the first basic formula discovered by Leonhard Euler, and known as the Euler-Fourier formulas. They found wide use and wide range of physics, including acoustics and electromagnetic theory.

In matters of mathematics, Euler particularly interested in the field of calculus, differential formula, and the infinity of the number. His contributions in this field, although very important, too technical here presented. His contributions in the field of calculus of variations and the theory of complexity number is the basis of all subsequent developments in this field. The two topics that have a broad range of work in the field of the use of scientific practice, in addition to the importance in the field of pure mathematics.

Euler formula,, shows the relationship between the trigonometric functions and the imaginary number, and can be found the logarithm of a negative number. This is one of the most widely used formula in all areas of mathematics. Euler also wrote a textbook on analytical geometry and made important contributions in the field of differential geometry and normal.

Although Euler had a great ability for mathematical discoveries that enable it to do scientific practices, he almost had equal advantages in the field of pure mathematics. Unfortunately, so many contributions in the field of number theory, but not so much that can be presented here. Euler also those beginners who work in topology, a branch of mathematics that have important meaning in the 20th century.

Finally, Euler made important contributions made mathematical symbol system of the present number. For example, he was responsible for general use Greek letters to describe the ratio between the circumference of a circle to its diameter. He also introduced many systems are now signs that fit commonly used in mathematics.

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