This week we celebrated Euler’s birthday on 15th and I thought I need to write something about him. In my (almost) 4 years of university I have heard his name a lot of time. And this is a thing especially because at most of my courses the teachers don’t say anything about the mathematicians that worked at the things we see on the blackboard or in our notes. So here are a couple of things I have learned about Euler:

- we have to thank him for a couple of
*notations* we use today: f(x) to denote the function f applied to the argument x; notation for the trigonometric functions; the Greek letter Σ for summations and the letter i to denote the imaginary unit.
*Euler’s number*: the number e is an important mathematical constant that is the base of the natural logarithm; it is approximately equal to 2.71828. It has a lot of other incredible properties and you can find it almost everywhere in mathematics from calculus to number theory and probability.
*Euler’s formula*: a mathematical formula in complex analysis that establishes the fundamental relationship between the trigonometric functions and the complex exponential function.
*Euler’s identity*: mathematical beauty at its maximum and a combination of imaginary numbers, trigonometry and the number 0.

These are not the only things he has done, but are the ones that I consider some of the most important ones and I have used them often. And just in the end a small quote:

Thank you for reading. You can find me on Facebook, Tumblr, Google+, Twitter and Instagram, I will try to post there as often as possible. *Don’t forget that maths is everywhere! Enjoy! *

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I have occasionally advised friends that if they need to infiltrate a group of mathematicians and sound like part of the conversation they should just say “Well, that goes back to Euler’s theorem”. The amazing thing is how often you can get away with that.

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Hi,

Leonard Euler was a great genius especial in maths. Hieß work is written in ‘Opera Omnia’ is a collection of a lot of books, written in several languages. I like his ‘letters in the youth’ eheren he was intensed to ask himself questions no other have Hand that times. He was one of he great mathematical philosophers that time. The so called Euler number is founded for an constant in natural science.

Nice that little note from You.

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He is indeed a great genius and I know that he has done other incredible things besides the ones I have written about here 🙂

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