Leonhard Euler
![Portrait by [[Jakob Emanuel Handmann]], 1753](https://upload.wikimedia.org/wikipedia/commons/d/d7/Leonhard_Euler.jpg)
Euler is held to be one of the greatest, most prolific mathematicians in history and the greatest of the 18th century. Several great mathematicians who produced their work after Euler's death have recognised his importance in the field as shown by quotes attributed to many of them: Pierre-Simon Laplace expressed Euler's influence on mathematics by stating, "Read Euler, read Euler, he is the master of us all." Carl Friedrich Gauss wrote: "The study of Euler's works will remain the best school for the different fields of mathematics, and nothing else can replace it." "" [The special publication of the smaller Euler treatises is certainly something highly deserving, [...] and the study of all Euler's works will always remain the best school for the various mathematical fields, which cannot be replaced by anything else.]}} His 866 publications as well as his correspondences are being collected in the ''Opera Omnia Leonhard Euler'' which, when completed, will consist of 81 ''quartos''. He spent most of his adult life in Saint Petersburg, Russia, and in Berlin, then the capital of Prussia.
Euler is credited for popularizing the Greek letter (lowercase pi) to denote the ratio of a circle's circumference to its diameter, as well as first using the notation for the value of a function, the letter to express the imaginary unit , the Greek letter (capital sigma) to express summations, the Greek letter (capital delta) for finite differences, and lowercase letters to represent the sides of a triangle while representing the angles as capital letters. He gave the current definition of the constant , the base of the natural logarithm, now known as Euler's number.
Euler is also credited with being the first to develop graph theory (partly as a solution for the problem of the Seven Bridges of Königsberg, which is also considered the first practical application of topology). He also became famous for, among many other accomplishments, providing a solution to several unsolved problems in number theory and analysis, including the famous Basel problem. Euler has also been credited for discovering that the sum of the numbers of vertices and faces minus the number of edges of a polyhedron equals 2, a number now commonly known as the Euler characteristic. In the field of physics, Euler reformulated Newton's laws of physics into new laws in his two-volume work ''Mechanica'' to better explain the motion of rigid bodies. He also made substantial contributions to the study of elastic deformations of solid objects. Provided by Wikipedia
81
Published: 1959
Superior document: Leonhardi Euleri opera omnia Series 2, Opera mechanica et astronomica, Vol. 28
82
Published: 1953
Superior document: Leonhardi Euleri opera omnia Series 1, Opera mathematica, Vol. 26
83
Published: 1960
Superior document: Leonhardi Euleri opera omnia Series 3, Opera physica, miscellanea epistolae, Vol.11
84
Published: 1954
Superior document: Leonhardi Euleri opera omnia Series 1, Opera mathematica, Vol. 27
85
Published: 1960
Superior document: Leonhardi Euleri opera omnia Series 2, Opera mechanica et astronomica, Vol. 25
86
Published: 1947
87
Published: 1960
Superior document: Leonhardi Euleri opera omnia Series 2, Opera mechanica et astronomica, Vol. 11, Sectio 2
88
Published: [2013]
Superior document: Title is part of eBook package: De Gruyter DGBA Architecture, Design and Arts 2000 - 2014
Links: Get full text; Get full text; Cover
89
Published: [2013]
Superior document: Title is part of eBook package: De Gruyter DGBA Architecture, Design and Arts 2000 - 2014
Links: Get full text; Get full text; Cover
90
Published: 2022.
Superior document: Routledge Advances in Theatre and Performance Studies
91
Published: [2023]
Superior document: Routledge Advances in Theatre and Performance Studies
92
Published: 2023.
Superior document: Routledge advances in theatre and performance studies
93
Published: [2022]
Links: Get full text; Get full text; Cover
94
Published: 2005.
Superior document: Finanzwissenschaftliche Schriften Series ; v.114
Links: Get full text
95
Published: 2012
Superior document: Kataloge der Oberösterreichischen Landesmuseen N.S., 135
96
Keramik aus St. Peter bei Freistadt / hrsg. vom Oberösterreichischen Landesmuseum Linz. Andrea Euler
Published: 2014
Superior document: Studien zur Kulturgeschichte von Oberösterreich 38
Links: Inhaltsverzeichnis
97
Published: 2012
Superior document: Kataloge der Oberösterreichischen Landesmuseen N.S., 141
98
Published: 2002
Superior document: Kataloge des OÖ. Landesmuseums N.F., 188
Links: Inhaltsverzeichnis
99
Other Authors:
“...Euler, Leonhard 1707-1783...”
100
Published: [2016]
Superior document: Kulturelles Erbe in der digitalen Welt ; Band 2