The concept is regarded as a fundamental theorem of number theory and his ideas paved the way for the work of Carl Friedrich Gauss. This was partly because of a conflict of personality with Frederick who came to regard Euler as unsophisticated especially in comparison to the circle of philosophers the German king brought to the Academy. Petersburg establiLeonhard Eulerd by Peter the Great was intended to improve education in Russia and to close the scientific gap with Western Europe.
He also introduced much of the modern mathematical terminology and notation particularly for mathematical analysis such as the notion of a mathematical function. Petersburg Russia and in Berlin Prussia. Euler spent most of his adult life in St.