About: Affine curvature     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Shape100027807, within Data Space : dbpedia.org associated with source document(s)
QRcode icon
http://dbpedia.org/describe/?url=http%3A%2F%2Fdbpedia.org%2Fresource%2FAffine_curvature

Special affine curvature, also known as the equiaffine curvature or affine curvature, is a particular type of curvature that is defined on a plane curve that remains unchanged under a special affine transformation (an affine transformation that preserves area). The curves of constant equiaffine curvature k are precisely all non-singular plane conics. Those with k > 0 are ellipses, those with k = 0 are parabolae, and those with k < 0 are hyperbolae.

AttributesValues
rdf:type
rdfs:label
  • Affine curvature (en)
  • انحناء تآلفي (ar)
  • Аффинная кривизна (ru)
rdfs:comment
  • الانحناء التآلفي هو نوع خاص من الانحناء المعرف على منحني في مستوي الذي يبقى بدون أي تغيير تحت التحويل التآلفي. فتحافظ النقاط ذات انحناء صفر على هذه الخاصة بعد التحويل التآلفي. إذا كان لدينا منحني مستوي تآلفي. نختار إحداثيات للمستوي التآلفي بحيث أن مساحة متوازي الأضلاع المحدد بالمتجهتين و تعطى بالعلاقة: وعندها يعطى الانحناء التآلفي بالعلاقة: حيث β' ترمز إلى مشتق β بالنسبة إلى t. (ar)
  • Аффинная кривизна — дифференциальная характеристика кривой, инвариантная относительно эквиаффинных преобразований (то есть аффинных преобразований, сохраняющих площадь). Для параметрически заданной плоской кривой аффинная кривизна определяется таким уравнением: (ru)
  • Special affine curvature, also known as the equiaffine curvature or affine curvature, is a particular type of curvature that is defined on a plane curve that remains unchanged under a special affine transformation (an affine transformation that preserves area). The curves of constant equiaffine curvature k are precisely all non-singular plane conics. Those with k > 0 are ellipses, those with k = 0 are parabolae, and those with k < 0 are hyperbolae. (en)
dcterms:subject
Wikipage page ID
Wikipage revision ID
Link from a Wikipage to another Wikipage
sameAs
dbp:wikiPageUsesTemplate
first
  • A.P. (en)
id
  • A/a010980 (en)
  • a/a010990 (en)
last
  • Shirokov (en)
title
  • Affine curvature (en)
  • Affine differential geometry (en)
year
has abstract
  • الانحناء التآلفي هو نوع خاص من الانحناء المعرف على منحني في مستوي الذي يبقى بدون أي تغيير تحت التحويل التآلفي. فتحافظ النقاط ذات انحناء صفر على هذه الخاصة بعد التحويل التآلفي. إذا كان لدينا منحني مستوي تآلفي. نختار إحداثيات للمستوي التآلفي بحيث أن مساحة متوازي الأضلاع المحدد بالمتجهتين و تعطى بالعلاقة: وعندها يعطى الانحناء التآلفي بالعلاقة: حيث β' ترمز إلى مشتق β بالنسبة إلى t. (ar)
  • Special affine curvature, also known as the equiaffine curvature or affine curvature, is a particular type of curvature that is defined on a plane curve that remains unchanged under a special affine transformation (an affine transformation that preserves area). The curves of constant equiaffine curvature k are precisely all non-singular plane conics. Those with k > 0 are ellipses, those with k = 0 are parabolae, and those with k < 0 are hyperbolae. The usual Euclidean curvature of a curve at a point is the curvature of its osculating circle, the unique circle making second order contact (having three point contact) with the curve at the point. In the same way, the special affine curvature of a curve at a point P is the special affine curvature of its hyperosculating conic, which is the unique conic making fourth order contact (having five point contact) with the curve at P. In other words it is the limiting position of the (unique) conic through P and four points P1, P2, P3, P4 on the curve, as each of the points approaches P: In some contexts, the affine curvature refers to a differential invariant κ of the general affine group, which may readily obtained from the special affine curvature k by κ = k−3/2dk/ds, where s is the special affine arc length. Where the general affine group is not used, the special affine curvature k is sometimes also called the affine curvature. (en)
  • Аффинная кривизна — дифференциальная характеристика кривой, инвариантная относительно эквиаффинных преобразований (то есть аффинных преобразований, сохраняющих площадь). Для параметрически заданной плоской кривой аффинная кривизна определяется таким уравнением: (ru)
prov:wasDerivedFrom
page length (characters) of wiki page
foaf:isPrimaryTopicOf
is Link from a Wikipage to another Wikipage of
is Wikipage redirect of
Faceted Search & Find service v1.17_git139 as of Feb 29 2024


Alternative Linked Data Documents: ODE     Content Formats:   [cxml] [csv]     RDF   [text] [turtle] [ld+json] [rdf+json] [rdf+xml]     ODATA   [atom+xml] [odata+json]     Microdata   [microdata+json] [html]    About   
This material is Open Knowledge   W3C Semantic Web Technology [RDF Data] Valid XHTML + RDFa
OpenLink Virtuoso version 08.03.3330 as of Mar 19 2024, on Linux (x86_64-generic-linux-glibc212), Single-Server Edition (61 GB total memory, 49 GB memory in use)
Data on this page belongs to its respective rights holders.
Virtuoso Faceted Browser Copyright © 2009-2024 OpenLink Software