Leonhard Euler (1707 – 1783) (/ˈɔɪlər/ OY-lər; German pronunciation: [ˈɔʏlɐ], local pronunciation: [ˈɔɪlr̩]) was a pioneering Swiss mathematician and physicist. He made important discoveries in fields as diverse as infinitesimal calculus and graph theory. He also introduced much of the modern mathematical terminology and notation, particularly for mathematical analysis, such as the notion of a mathematical function.