Leonhard Euler was a leading Swiss mathematician and physicist who made significant discoveries in varied fields such as graph theory and infinitesimal calculus. He also defined a substantial amount of contemporary mathematical terminology and notation, specifically for mathematical analysis, such as the notion of a mathematical function. He is also well renowned for his works in fluid dynamics, astronomy, mechanics and optics. Euler worked on his subjects mostly in St. Petersburg (Russia) and in Berlin, during his adulthood. All his collections, if printed, would occupy 60-80 quarto volumes reflecting his outstanding mathematical abilities. Euler was a versatile mathematician who worked on a spectrum of topics such as number theory, algebra, geometry and trigonometry and in different areas of physics such as continuum physics, lunar theory, etc. Contrary to Monadism and Wolffian science, Euler firmly believed in knowledge found on the basis of exact quantitative laws.

**Childhood And Early Life**

**St. Petersburg**

**Personal Life**

**Death And Legacy**

^{th}September 1783, after a lunch with his family in St Petersburg, Euler suffered a brain hemorrhage and expired a few hours later. He was buried at the Smolensk Lutheran Cemetery on Vasilievsky Island, next to his first wife Katharina. The Russian Academy of Sciences put a marble bust of Leonhard Euler on a pedestal adjacent to the Director's seat in 1785 and placed a headstone on Euler's grave in 1837. To pay tribute to the 250th anniversary of Euler's birth, the headstone, along with his remains, was relocated to the 18th-century necropolis at the Alexander Nevsky Monastery in 1956.

**Contributions To Mathematics And Physics**

**Mathematical Notation**

**Analysis**

**Number Theory**

**Physics And Astronomy**

LEONHARD EULER TIMELINE

Was born on April 15, in Basel, Switzerland

Received his Master of Philosophy with a thesis that compared the philosophies of Descartes and Newton.

Finished a dissertation on the propagation of sound titled ‘De Sono’.

Entered the Paris Academy Prize Problem competition and won second place.

Was made a professor of physics.

On 7 January, he married Katharina Gsell.

Became almost blind in his right eye.

Left St. Petersburg on 19 June to take up a post at the Berlin Academy.

Published the ‘Introductio in analysin infinitorum’, a manuscript on functions.

Published the ‘Institutiones calculi differentialis’, on differential calculus.

Suffered a cataract in his good left eye, leaving him almost completely blind.

Produced on average one mathematical paper every week, this year.

Lost his home in a fire in St. Petersburg.

Lost his wife Katharina after 40 years of marriage.

Suffered a brain hemorrhage and died a few hours later in Saint Petersburg.

The Russian Academy of Sciences placed a marble bust of Leonhard Euler on a pedestal next to the Director's seat.

The Russian Academy of Sciences placed a headstone on Euler's grave.

Pictures of Leonhard Euler