Simon Antoine Jean L'Huillier(Geneva, 24 April 1750 - Geneva, 28 March 1840) was a Swiss mathematician of French Hugenot descent. He is known for his work in mathematical analysis and topology, and in particular the generalization of Euler's formula for planar graphs. Geneva (pronunciation //; French: Genève //, German: //, Italian: Ginevra) is the second most populous city in Switzerland (after Zürich), and is the most populous city of Romandy (the French-speaking part of Switzerland). ... April 24 is the 114th day of the year in the Gregorian Calendar (115th in leap years). ... Events March 2 - Small earthquake in London, England April 4 - Small earthquake in Warrington, England August 23 - Small earthquake in Spalding, England September 30 - Small earthquake in Northampton, England November 16 – Westminster Bridge officially opened Jonas Hanway is the first Englishman to use an umbrella James Gray reveals her sex... Geneva (pronunciation //; French: Genève //, German: //, Italian: Ginevra) is the second most populous city in Switzerland (after Zürich), and is the most populous city of Romandy (the French-speaking part of Switzerland). ... March 28 is the 87th day of the year in the Gregorian Calendar (88th in leap years). ... 1840 is a leap year starting on Wednesday (link will take you to calendar). ... To meet Wikipedias quality standards, this article or section may require cleanup. ... In the 16th and 17th centuries, the name of Huguenots came to apply to members of the Protestant Reformed Church of France. ... Analysis is the generic name given to any branch of mathematics that depends upon the concepts of limits and convergence. ... A Möbius strip, a surface with only one side and one edge; such shapes are an object of study in topology. ... // In graph theory, a planar graph is a graph that can be drawn (mathematicians say can be embedded in the plane) so that no edges intersect. ... In graph theory, a planar graph is a graph that can be embedded in a plane so that no edges intersect. ...