A tour d'horizon of de Casteljau's work
Whilst Paul de Casteljau is now famous for his fundamental algorithm of curve and surface approximation, little is known about his other findings. This article offers an insight into his results in geometry, algebra and number theory. Related to geometry, his classical algorithm is reviewed as an in...
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| Published in: | Computer aided geometric design Vol. 113; p. 102366 |
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| Language: | English |
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01.09.2024
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| ISSN: | 0167-8396 |
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| Abstract | Whilst Paul de Casteljau is now famous for his fundamental algorithm of curve and surface approximation, little is known about his other findings. This article offers an insight into his results in geometry, algebra and number theory.
Related to geometry, his classical algorithm is reviewed as an index reduction of a polar form. This idea is used to show de Casteljau's algebraic way of smoothing, which long went unnoticed. We will also see an analytic polar form and its use in finding the intersection of two curves. The article summarises unpublished material on metric geometry. It includes theoretical advances, e.g., the 14-point strophoid or a way to link Apollonian circles with confocal conics, and also practical applications such as a recurrence for conjugate mirrors in geometric optics. A view on regular polygons leads to an approximation of their diagonals by golden matrices, a generalisation of the golden ratio.
Relevant algebraic findings include matrix quaternions (and anti-quaternions) and their link with Lorentz' equations. De Casteljau generalised the Euclidean algorithm and developed an automated method for approximating the roots of a class of polynomial equations. His contributions to number theory not only include aspects on the sum of four squares as in quaternions, but also a view on a particular sum of three cubes. After a review of a complete quadrilateral in a heptagon and its angles, the paper concludes with a summary of de Casteljau's key achievements.
The article contains a comprehensive bibliography of de Casteljau's works, including previously unpublished material.
•Insight into de Casteljau's contributions to geometry, algebra, and number theory.•Algebraic smoothing with polar forms using Aitken, de Boor, de Casteljau.•Metric geometry advances: 14-point strophoid, geometric optics, regular polygon approximation.•Algebraic findings: matrix quaternions and a generalised Euclidean algorithm.•Summary of his mathematical œuvre, including a comprehensive bibliography. |
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| AbstractList | Whilst Paul de Casteljau is now famous for his fundamental algorithm of curve and surfaceapproximation, little is known about his other findings. This article offers an insight into hisresults in geometry, algebra and number theory.Related to geometry, his classical algorithm is reviewed as an index reduction of a polar form.This idea is used to show de Casteljau’s algebraic way of smoothing, which long went unnoticed. We will also see an analytic polar form and its use in finding the intersection of two curves. The article summarises unpublished material on metric geometry. It includes theoretical advances, e.g., the 14-point strophoid or a way to link Apollonian circles with confocal conics, and also practical applications such as a recurrence for conjugate mirrors in geometric optics. A view on regular polygons leads to an approximation of their diagonals by golden matrices, a generalisation of the golden ratio.Relevant algebraic findings include matrix quaternions (and anti-quaternions) and their link with Lorentz’ equations. De Casteljau generalised the Euclidean algorithm and developed an automated method for approximating the roots of a class of polynomial equations. His contributions to number theory not only include aspects on the sum of four squares as in quaternions, but also a view on a particular sum of three cubes. After a review of a complete quadrilateral in a heptagon and its angles, the paper concludes with a summary of de Casteljau’s key achievements.The article contains a comprehensive bibliography of de Casteljau’s works, including previouslyunpublished material.
Si Paul de Casteljau est aujourd'hui célèbre pour son algorithme fondamental d'approximation de courbes et de surfaces, peu de choses sont connues sur ses autres découvertes. Cet article offer un aperçu de ses résultats en géométrie, algèbre et théorie des nombres.En ce qui concerne la géométrie, son algorithme classique est examiné en tant que réduction d'indice d'une forme polaire. Cette idée est utilisée pour montrer une lissage algébrique de de Casteljau, qui est longtemps passée inaperçue. Nous verrons également une forme polaire analytique et son utilisation pour trouver l'intersection de deux courbes. L'article résume des documents inédits sur la géométrie métrique. Il comprend des avancées théoriques, par exemple la strophoïde à 14 points ou une façon de relier les cercles apolliniens aux coniques homofocales, ainsi que des applications pratiques telles qu'une récurrence pour les miroirs conjugués en optique géométrique. Un point de vue sur les polygones réguliers conduit à une approximation de leurs diagonales par des matrices d'or, une généralisation du nombre d'or.Les découvertes algébriques pertinentes comprennent les quaternions matriciels (et les anti-quaternions) et leur lien avec les équations de Lorentz. De Casteljau a généralisé l'algorithme d'Euclide et a développé une méthode automatisée d'approximation des racines d'une classe d'équations polynomiales. Ses contributions à la théorie des nombres comprennent non seulement des aspects sur la somme de quatre carrés comme dans les quaternions, mais aussi un point de vue sur une somme particulière de trois cubes. Après un examen d'un quadrilatère complet dans un heptagone et de ses angles, l'article se termine par un résumé des principales réalisations de Casteljau.L'article contient une bibliographie complète des travaux de Casteljau, y compris des documents inédits. Whilst Paul de Casteljau is now famous for his fundamental algorithm of curve and surface approximation, little is known about his other findings. This article offers an insight into his results in geometry, algebra and number theory. Related to geometry, his classical algorithm is reviewed as an index reduction of a polar form. This idea is used to show de Casteljau's algebraic way of smoothing, which long went unnoticed. We will also see an analytic polar form and its use in finding the intersection of two curves. The article summarises unpublished material on metric geometry. It includes theoretical advances, e.g., the 14-point strophoid or a way to link Apollonian circles with confocal conics, and also practical applications such as a recurrence for conjugate mirrors in geometric optics. A view on regular polygons leads to an approximation of their diagonals by golden matrices, a generalisation of the golden ratio. Relevant algebraic findings include matrix quaternions (and anti-quaternions) and their link with Lorentz' equations. De Casteljau generalised the Euclidean algorithm and developed an automated method for approximating the roots of a class of polynomial equations. His contributions to number theory not only include aspects on the sum of four squares as in quaternions, but also a view on a particular sum of three cubes. After a review of a complete quadrilateral in a heptagon and its angles, the paper concludes with a summary of de Casteljau's key achievements. The article contains a comprehensive bibliography of de Casteljau's works, including previously unpublished material. •Insight into de Casteljau's contributions to geometry, algebra, and number theory.•Algebraic smoothing with polar forms using Aitken, de Boor, de Casteljau.•Metric geometry advances: 14-point strophoid, geometric optics, regular polygon approximation.•Algebraic findings: matrix quaternions and a generalised Euclidean algorithm.•Summary of his mathematical œuvre, including a comprehensive bibliography. |
| ArticleNumber | 102366 |
| Author | Müller, Andreas |
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| Keywords | Quasi-interpolation 11B39 30C20 01A70 78A05 de Casteljau algorithm 11R52 Metric geometry 68U07 51F15 35Q60 Blossoming and polar forms Generalised Euclidean algorithm 51G05 Quaternions 14-point strophoid Geometric optics 65D17 Regular polygons Polar form Quaternion Blossoming Euclidean Algorithm Regular polygon Generalised Euclidean Algorithm De Casteljau algorithm |
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Translated into German Stärk (br1060) 1976 de Casteljau (br1350) 1998 Rabut (br0890) 2024 Brocard (10.1016/j.cagd.2024.102366_br0240) 1919 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1340) 1997 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1320) 1995 Haase (10.1016/j.cagd.2024.102366_br0620) 1870; 2 Klein (10.1016/j.cagd.2024.102366_br0650) 1926-1927 Boehm (10.1016/j.cagd.2024.102366_br0160) 1981; 13 Miller (10.1016/j.cagd.2024.102366_br0760) 1968; 263 Sanchez-Reyes (10.1016/j.cagd.2024.102366_br0990) 2002; 19 Aitken (10.1016/j.cagd.2024.102366_br0010) 1926; 45 Aitken (10.1016/j.cagd.2024.102366_br0020) 1932; 3 Versprille (10.1016/j.cagd.2024.102366_br1130) 1975 Bézier (10.1016/j.cagd.2024.102366_br0080) 1971; 321 Boehm (10.1016/j.cagd.2024.102366_br0150) 1977; 18 Prautzsch (10.1016/j.cagd.2024.102366_br0860) 2023 Sanchez-Reyes (10.1016/j.cagd.2024.102366_br0980) 1990; 22 Seidel (10.1016/j.cagd.2024.102366_br1010) 1988; 5 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1190) 1956; 17 Poitou (10.1016/j.cagd.2024.102366_br0850) 1989 Guy (10.1016/j.cagd.2024.102366_br0610) 2007; 114 Müller (10.1016/j.cagd.2024.102366_br0770) 1995 Steinbach (10.1016/j.cagd.2024.102366_br1090) 2000 Casciola (10.1016/j.cagd.2024.102366_br0260) 1996 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1310) 1994 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1390) 2001; 16 Müller (10.1016/j.cagd.2024.102366_br0790) 1995 Urban-Galindo (10.1016/j.cagd.2024.102366_br1100) 2019 Deltheil (10.1016/j.cagd.2024.102366_br0520) 1950 Plévert (10.1016/j.cagd.2024.102366_br0840) 2011 Mersenne (10.1016/j.cagd.2024.102366_br0750) 1636 Schweins (10.1016/j.cagd.2024.102366_br1000) 1825 Dahmen (10.1016/j.cagd.2024.102366_br0340) 1992; 59 Akritas (10.1016/j.cagd.2024.102366_br0030) 1981; 7 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1370) 1999; 193 Steinbach (10.1016/j.cagd.2024.102366_br1080) 1997; 70 Carpo (10.1016/j.cagd.2024.102366_br0250) 2017 Riabenki (10.1016/j.cagd.2024.102366_br0940) 1974 Waring (10.1016/j.cagd.2024.102366_br1150) 1762 Bézier (10.1016/j.cagd.2024.102366_br0070) 1970 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br0270) 1973 Mazure (10.1016/j.cagd.2024.102366_br0730) 1999; 15 Ramshaw (10.1016/j.cagd.2024.102366_br0910) 1989; 6 Klein (10.1016/j.cagd.2024.102366_br0660) 1928 de Casteljau (10.1016/j.cagd.2024.102366_br1300) 1993 Altmann (10.1016/j.cagd.2024.102366_br0050) 1989; 62 Smith (10.1016/j.cagd.2024.102366_br1030) 2021 10.1016/j.cagd.2024.102366_br1200 Whittaker (10.1016/j.cagd.2024.102366_br1160) 1918; 36 10.1016/j.cagd.2024.102366_br0230 Farin (10.1016/j.cagd.2024.102366_br0540) 1993 Akritas (10.1016/j.cagd.2024.102366_br0040) 2008; 13 Boehm (10.1016/j.cagd.2024.102366_br0180) 1984; 1 Neville (10.1016/j.cagd.2024.102366_br0800) 1934; 20 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1380) 2000 Stärk (10.1016/j.cagd.2024.102366_br1060) 1976 Godeaux (10.1016/j.cagd.2024.102366_br0580) 1947 Berrut (10.1016/j.cagd.2024.102366_br0060) 2004; 46 Randow (10.1016/j.cagd.2024.102366_br0930) 2010; 35 Böhm (10.1016/j.cagd.2024.102366_br0200) 1977 (10.1016/j.cagd.2024.102366_br0870) 2002 Lagrange (10.1016/j.cagd.2024.102366_br0680) 2008 Mazure (10.1016/j.cagd.2024.102366_br0740) 2005; 39 Lucas (10.1016/j.cagd.2024.102366_br0710) 1876; 2 de Casteljau (10.1016/j.cagd.2024.102366_br1260) 1987 10.1016/j.cagd.2024.102366_br1210 Bieri (10.1016/j.cagd.2024.102366_br0140) 1999; 16 10.1016/j.cagd.2024.102366_br1330 Boehm (10.1016/j.cagd.2024.102366_br0170) 1993; 10 Hamilton (10.1016/j.cagd.2024.102366_br0630) Boehm (10.1016/j.cagd.2024.102366_br0190) 1999; 16 10.1016/j.cagd.2024.102366_br1290 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1240) 1985; vol. 2 Bézier (10.1016/j.cagd.2024.102366_br0120) 1982; 4 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1250) 1986; vol. 2 Riesenfeld (10.1016/j.cagd.2024.102366_br0950) 1973 Willstrop (10.1016/j.cagd.2024.102366_br1180) 2003; 342 de Casteljau (10.1016/j.cagd.2024.102366_br1350) 1998 Versprille (10.1016/j.cagd.2024.102366_br1120) Rabut (10.1016/j.cagd.2024.102366_br0890) 2024 10.1016/j.cagd.2024.102366_br1220 Laurent (10.1016/j.cagd.2024.102366_br0690) 2001; 18 Ramshaw (10.1016/j.cagd.2024.102366_br0920) 1991 Bézier (10.1016/j.cagd.2024.102366_br0090) 1966; XI (10.1016/j.cagd.2024.102366_br0590) 1993 Bézier (10.1016/j.cagd.2024.102366_br0130) 1982; 4 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1400) 2001; 16 Farouki (10.1016/j.cagd.2024.102366_br0550) 2012; 29 Chipalkatti (10.1016/j.cagd.2024.102366_br0320) 2020; 9 de Boor (10.1016/j.cagd.2024.102366_br0220) 2003; 124 Forrest (10.1016/j.cagd.2024.102366_br0560) 1972; 15 Müller (10.1016/j.cagd.2024.102366_br0780) 2024 Lemaître (10.1016/j.cagd.2024.102366_br0700) 2009 Marchouk (10.1016/j.cagd.2024.102366_br0720) 1980 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1280) 1992 Gormaz (10.1016/j.cagd.2024.102366_br0600) 1993 10.1016/j.cagd.2024.102366_br0820 Ramshaw (10.1016/j.cagd.2024.102366_br0900) 1987 Stefanus (10.1016/j.cagd.2024.102366_br1070) 1992; 9 Veronese (10.1016/j.cagd.2024.102366_br1110) 1877; 3 Rabut (10.1016/j.cagd.2024.102366_br0880) 2002; 34 10.1016/j.cagd.2024.102366_br1230 Bézier (10.1016/j.cagd.2024.102366_br0100) 1967; XII Gardan (10.1016/j.cagd.2024.102366_br0570) Nicolas (10.1016/j.cagd.2024.102366_br0810) Wildberger (10.1016/j.cagd.2024.102366_br1170) de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1360) 1999; 16 Cox (10.1016/j.cagd.2024.102366_br0330) 1972; 10 Stachel (10.1016/j.cagd.2024.102366_br1050) 2015; 12 Seidel (10.1016/j.cagd.2024.102366_br1020) 1991; 7 (10.1016/j.cagd.2024.102366_br0530) 1971 Rodrigues (10.1016/j.cagd.2024.102366_br0960) 1840; 1 de Boor (10.1016/j.cagd.2024.102366_br0210) 1972; 6 Vincent (10.1016/j.cagd.2024.102366_br1140) 1834; 1 Krautter (10.1016/j.cagd.2024.102366_br0670) 1971; 44 Bézier (10.1016/j.cagd.2024.102366_br0110) 1968 Salmon (10.1016/j.cagd.2024.102366_br0970) 1884 Klein (10.1016/j.cagd.2024.102366_br0640) 1895 Stachel (10.1016/j.cagd.2024.102366_br1040) 2015; 10 (10.1016/j.cagd.2024.102366_br0830) 1993 de Faget de Casteljau (10.1016/j.cagd.2024.102366_br1270) 1990 |
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| Snippet | Whilst Paul de Casteljau is now famous for his fundamental algorithm of curve and surface approximation, little is known about his other findings. This article... Whilst Paul de Casteljau is now famous for his fundamental algorithm of curve and surfaceapproximation, little is known about his other findings. This article... |
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| SubjectTerms | 14-point strophoid Blossoming and polar forms Computational Geometry Computer Science de Casteljau algorithm Differential Geometry General Mathematics Generalised Euclidean algorithm Geometric optics Mathematics Metric Geometry Number Theory Optics Physics Quasi-interpolation Quaternions Regular polygons |
| Title | A tour d'horizon of de Casteljau's work |
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