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Master's Dissertation
DOI
https://doi.org/10.11606/D.55.2010.tde-07102010-145223
Document
Author
Full name
Luis Florial Espinoza Sanchez
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2010
Supervisor
Committee
Saia, Marcelo José (President)
Fernandes, Alexandre César Gurgel
Martins, Luciana de Fátima
Title in Portuguese
Singularidades de curvas na geometria afim
Keywords in Portuguese
Aberração
Curvas planas
Geometria afim
Teoria de singularidades
Abstract in Portuguese
Neste trabalho estudamos a geometria da evoluta afim e da curva normal afim associada à uma curva plana sem inflexões a partir do tipo de singularidade das funções suporte afim. O principal resultado estabelece que se '\gamma' é uma curva plana sem inflexões, satisfazendo certas condições genéricas então dois casos podem ocorrer: 1. se p é um ponto da evoluta afim de '\gamma' em 's IND. 0' então temos dois casos: se '\gamma' ('s IND. 0') é um ponto sextático então, localmente em p, a evoluta afim é difeomorfa a uma cúspide em 'R POT. 2' ; se não, localmente em p, a evoluta afim é difeomorfa à uma reta em 'R POT. 2' , 2. se p = '\gamma' ('s IND. 0') é um ponto da normal afim de '\gamma' então temos dois casos: se '\gamma'('s IND. 0') é um ponto parabólico de '\gamma' então, localmente em p, a curva normal afim é difeomorfa a uma cúspide em 'R POT. 2' ; em outro caso, localmente em p, a curva normal afim é difeomorfa à uma reta em 'R POT. 2'
Title in English
Singularities of curves in affine geometry
Keywords in English
Aberrancy
Affine geometry
Plane curves
Singulartity theory
Abstract in English
In this work we study the geometry of the affine evolute and the affine normal curve associated with a plane curve without inflections from the type of singularity of affine support functions. The main result is setting if '\gamma' is a flat curve without inflections, satisfying certain conditions generic then, if p is a point of the affine evolute of '\gamma' at 's IND. 0' then two cases: if '\gamma' ('s IND. 0') is a sextactic point then locally in p the affine evolute is diffeomorphic to a cusp at 'R POT. 2', otherwise locally in p the affine evolute is diffeomorphic to a straight in 'R POT. 2', and second if p = '\gamma' ('s IND. 0') is a point of the affine normal curve then two cases: if '\gamma'('s IND. 0') is a parabolic point of '\gamma' then locally in p the affine normal curve is diffeomorphic to a cusp at 'R POT. 2' , in otherwise locally in p the affine normal curve is diffeomorphic to a line in 'R POT. 2'
 
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Publishing Date
2010-10-07
 
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