Evolutoids of the Mixed-Type Curves
The evolutoid of a regular curve in the Lorentz-Minkowski plane ℝ12 is the envelope of the lines between tangents and normals of the curve. It is regarded as the generalized caustic (evolute) of the curve. The evolutoid of a mixed-type curve has not been considered since the definition of the evolut...
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2021-01-01
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| Series: | Advances in Mathematical Physics |
| Online Access: | http://dx.doi.org/10.1155/2021/9330963 |
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| author | Xin Zhao Donghe Pei |
| author_facet | Xin Zhao Donghe Pei |
| author_sort | Xin Zhao |
| collection | DOAJ |
| description | The evolutoid of a regular curve in the Lorentz-Minkowski plane ℝ12 is the envelope of the lines between tangents and normals of the curve. It is regarded as the generalized caustic (evolute) of the curve. The evolutoid of a mixed-type curve has not been considered since the definition of the evolutoid at lightlike point can not be given naturally. In this paper, we devote ourselves to consider the evolutoids of the regular mixed-type curves in ℝ12. As the angle of lightlike vector and nonlightlike vector can not be defined, we introduce the evolutoids of the nonlightlike regular curves in ℝ12 and give the conception of the σ-transform first. On this basis, we define the evolutoids of the regular mixed-type curves by using a lightcone frame. Then, we study when does the evolutoid of a mixed-type curve have singular points and discuss the relationship of the type of the points of the mixed-type curve and the type of the points of its evolutoid. |
| format | Article |
| id | doaj-art-aa7bd8e7ba4e4bafa3395f73fe50a6a2 |
| institution | OA Journals |
| issn | 1687-9139 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Mathematical Physics |
| spelling | doaj-art-aa7bd8e7ba4e4bafa3395f73fe50a6a22025-08-20T02:20:54ZengWileyAdvances in Mathematical Physics1687-91392021-01-01202110.1155/2021/9330963Evolutoids of the Mixed-Type CurvesXin Zhao0Donghe Pei1School of Mathematics and StatisticsSchool of Mathematics and StatisticsThe evolutoid of a regular curve in the Lorentz-Minkowski plane ℝ12 is the envelope of the lines between tangents and normals of the curve. It is regarded as the generalized caustic (evolute) of the curve. The evolutoid of a mixed-type curve has not been considered since the definition of the evolutoid at lightlike point can not be given naturally. In this paper, we devote ourselves to consider the evolutoids of the regular mixed-type curves in ℝ12. As the angle of lightlike vector and nonlightlike vector can not be defined, we introduce the evolutoids of the nonlightlike regular curves in ℝ12 and give the conception of the σ-transform first. On this basis, we define the evolutoids of the regular mixed-type curves by using a lightcone frame. Then, we study when does the evolutoid of a mixed-type curve have singular points and discuss the relationship of the type of the points of the mixed-type curve and the type of the points of its evolutoid.http://dx.doi.org/10.1155/2021/9330963 |
| spellingShingle | Xin Zhao Donghe Pei Evolutoids of the Mixed-Type Curves Advances in Mathematical Physics |
| title | Evolutoids of the Mixed-Type Curves |
| title_full | Evolutoids of the Mixed-Type Curves |
| title_fullStr | Evolutoids of the Mixed-Type Curves |
| title_full_unstemmed | Evolutoids of the Mixed-Type Curves |
| title_short | Evolutoids of the Mixed-Type Curves |
| title_sort | evolutoids of the mixed type curves |
| url | http://dx.doi.org/10.1155/2021/9330963 |
| work_keys_str_mv | AT xinzhao evolutoidsofthemixedtypecurves AT donghepei evolutoidsofthemixedtypecurves |