His accomplishments include determining with great accuracy the orbits of comets and other celestial bodies, understanding the nature of comets, and calculating the parallax of the sun. Despite this tragedy, his productivity continued undiminished, sustained by an uncommon memory and a remarkable facility in mental computations.
In the interim he unsuccessfully applied for a physics professorship at the University of Basel. As a result, it was made especially attractive to foreign scholars like Euler.
Condorcet commented, " Euler had gained such a solid international reputation that the French Academy created a ninth slot for foreign membership, and elected Euler to that position in All of these requests were granted.
He then took some time to play with one of his many grandchildren, when he suffered a brain hemorrhage that took his life.
And inhe lost his wife of 40 years. He also introduced the modern notation for the trigonometric functions, the letter e for the base of the natural logarithm now also known as Euler's numberthe Greek letter for summations and the letter i to denote the imaginary unit.
Euler was featured on the sixth series of the Swiss franc banknote and on numerous Swiss, German, and Russian postage stamps. This part of his work, however, did not receive wide attention and was once described as too mathematical for musicians and too musical for mathematicians.
Vanity of geometry!
Vanity of vanities! For example, Euler could repeat the Aeneid of Virgil from beginning to end without hesitation, and for every page in the edition he used could indicate which line was the first and which the last.