In an investigation of the number of ways of dividing a polygon into triangles, he was the first to describe the Catalan sequence.
This man's namesake line passes through the orthocenter and the center of the nine-point circle of a triangle, among other notable points. In an investigation of the number of ways of dividing a polygon into triangles, he was the first to describe the Catalan sequence. A constant named for this man is the infinite sum of the harmonic number minus the natural logarithm of n and is also named for (*) Mascheroni. His namesake paths in a graph visit each edge exactly once, and these were first discussed in relation to seven bridges often associated with him. Also the namesake of the equation e to the power i pi equals negative one, FTP, name this Swiss mathematician after whom the base of the natural logarithm is named.
This man's namesake line passes through the orthocenter and the center of the nine-point circle of a triangle, among other notable points.
Leonhard {Euler}