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Which mathematician gave his name to a famous number, approximately equal to 2.718?

Euler

Leonhard Euler, one of the most prolific mathematicians in history, introduced and popularized several mathematical notations still in use today, such as the exponential function and the concept of a mathematical function. The number e, often called Euler's number, is the base of natural logarithms. It is unique because it is the only rate of growth for which the exponential function ex is its own derivative. Euler did not discover this number, but he studied it extensively, which contributed to its association with him. This number appears in many areas of science, including in the calculation of compound interest, population growth, and even in the distribution of prime numbers, demonstrating the deep interconnection between mathematics and the natural world.