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**Thébault** may refer to:

- 13775 Thébault, main belt asteroid with an orbital period of 4.39 years
- Alain Thébault (born 1962), French yachtsman
- Jacques Thébault (1924–2015), French comedian and voice actor
- Victor Thébault (1882–1960), French mathematician best known for propounding three problems in geometry
- Thébault's theorem, a geometry problem he proposed

- Thébault, Dutch variant of Rugby football

**Alain Thébault** is a French yachtsman, born September 19th, 1962 in Dijon.

**Jacques Thébault** was a French actor and voice actor. He has dubbed for or been the voice artist for:

**Victor Michael Jean-Marie Thébault** (1882–1960) was a French mathematician best known for propounding three problems in geometry. The name Thébault's theorem is used by some authors to refer to the first of these problems and by others to refer to the third.

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**Alain Connes** is a French mathematician, currently Professor at the Collège de France, IHÉS, Ohio State University and Vanderbilt University. He was an Invited Professor at the Conservatoire national des arts et métiers (2000).

**Algebraic geometry** is a branch of mathematics, classically studying zeros of multivariate polynomials. Modern algebraic geometry is based on the use of abstract algebraic techniques, mainly from commutative algebra, for solving geometrical problems about these sets of zeros.

In classical mathematics, **analytic geometry**, also known as **coordinate geometry** or **Cartesian geometry**, is the study of geometry using a coordinate system. This contrasts with synthetic geometry.

**Combinatorics** is an area of mathematics primarily concerned with counting, both as a means and an end in obtaining results, and certain properties of finite structures. It is closely related to many other areas of mathematics and has many applications ranging from logic to statistical physics, from evolutionary biology to computer science, etc.

**Euclidean geometry** is a mathematical system attributed to Alexandrian Greek mathematician Euclid, which he described in his textbook on geometry: the *Elements*. Euclid's method consists in assuming a small set of intuitively appealing axioms, and deducing many other propositions (theorems) from these. Although many of Euclid's results had been stated by earlier mathematicians, Euclid was the first to show how these propositions could fit into a comprehensive deductive and logical system. The *Elements* begins with plane geometry, still taught in secondary school as the first axiomatic system and the first examples of formal proof. It goes on to the solid geometry of three dimensions. Much of the *Elements* states results of what are now called algebra and number theory, explained in geometrical language.

**Mathematics** includes the study of such topics as quantity, structure, space, and change.

**Computational geometry** is a branch of computer science devoted to the study of algorithms which can be stated in terms of geometry. Some purely geometrical problems arise out of the study of computational geometric algorithms, and such problems are also considered to be part of computational geometry. While modern computational geometry is a recent development, it is one of the oldest fields of computing with history stretching back to antiquity.

**Eugène Charles Catalan** was a French and Belgian mathematician who worked on continued fractions, descriptive geometry, number theory and combinatorics. His notable contributions included discovering a periodic minimal surface in the space
; stating the famous Catalan's conjecture, which was eventually proved in 2002; and, introducing the Catalan numbers to solve a combinatorial problem.

In geometry, the **Japanese theorem** states that no matter how one triangulates a cyclic polygon, the sum of inradii of triangles is constant.

In Euclidean plane geometry, **Apollonius's problem** is to construct circles that are tangent to three given circles in a plane (Figure 1). Apollonius of Perga posed and solved this famous problem in his work Ἐπαφαί ; this work has been lost, but a 4th-century AD report of his results by Pappus of Alexandria has survived. Three given circles generically have eight different circles that are tangent to them (Figure 2), a pair of solutions for each way to divide the three given circles in two subsets.

**Thébault's theorem** is the name given variously to one of the geometry problems proposed by the French mathematician Victor Thébault, individually known as Thébault's problem I, II, and III.

In plane geometry, **Van Aubel's theorem** describes a relationship between squares constructed on the sides of a quadrilateral. Starting with a given quadrilateral, construct a square on each side. Van Aubel's theorem states that the two line segments between the centers of opposite squares are of equal lengths and are at right angles to one another. Another way of saying the same thing is that the center points of the four squares form the vertices of an equidiagonal orthodiagonal quadrilateral. The theorem is named after H. H. van Aubel, who published it in 1878.

**Geometry** is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space. A mathematician who works in the field of geometry is called a geometer.

**Marie-France Vignéras** is a French mathematician. She is a Professor Emeritus of the Institut de Mathématiques de Jussieu in Paris. She is known for her proof published in 1980 of the existence of isospectral non-isometric Riemann surfaces. Such surfaces show that one cannot hear the shape of a hyperbolic drum. Another highlight of her work is the establishment of the mod-l local Langlands correspondence for GL(n) in 2000. Her current work concerns the p-adic Langlands program.

The **2016 L'Open Emeraude Solaire de Saint-Malo** was a professional tennis tournament played on outdoor clay courts. It was the 21st edition of the tournament and part of the 2016 ITF Women's Circuit, offering a total of $50,000+H in prize money. It took place in Saint-Malo, France, on 19–25 September 2016.

**Aline Bonami** is a French mathematician known for her expertise in mathematical analysis. She is a professor emeritus at the University of Orléans, and was president of the Société mathématique de France for 2012–2013.

**Bernard Thébault** is a French boxer. He competed in the men's light heavyweight event at the 1964 Summer Olympics.