Über das Produkt inhomogener Linearformen
Рeter Gruber (1967)
Acta Arithmetica
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Рeter Gruber (1967)
Acta Arithmetica
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Zdeněk Jankovský (1995)
Mathematica Bohemica
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In this paper the plane Laguerre’s geometry in the augmented plane of dual numbers is presented. Basic integral and differential invariants of -curves in the plane are deduced, i.e. the -curve arc, -curvature, -minimal curves, -circle. Furthermore the contact of -curves, -osculating circle, -evolute of a curve and some special -motions are studied from the point of view of -Differential geometry.
S. Mazur, W. Orlicz (1934)
Studia Mathematica
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I. Schur (1937)
Compositio Mathematica
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H. Bothe (1963)
Fundamenta Mathematicae
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Hadwiger, H. (1948)
Portugaliae mathematica
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Otto Röschel (1995)
Applications of Mathematics
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Double Points on Characteristics. A fixed surface of a moving space will envelope a surface of the fixed space , if we move with respect to . In the general case at each moment of the one-parameter motion there exists a curve on , along which the position of and the enveloped surface are in contact. In the paper we study the interesting special case, where has some double point . This depends on relations between differential geometric properties in the neighbourhood...