Chord diagrams in the classification of Morse-Smale flows on 2-manifolds
Leonid Plachta (1998)
Banach Center Publications
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Leonid Plachta (1998)
Banach Center Publications
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András Szücs (1988)
Fundamenta Mathematicae
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Paul Cherenack (1995)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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John Guckenheimer (1973)
Annales de l'institut Fourier
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This paper outlines the manner in which Thom’s theory of catastrophes fits into the Hamilton-Jacobi theory of partial differential equations. The representation of solutions of a first order partial differential equation as lagrangian manifolds allows one to study the local structure of their singularities. The structure of generic singularities is closely related to Thom’s concept of the elementary catastrophe associated to a singularity. Three concepts of the stability of a singularity...
Robert F. Williams (1974)
Publications Mathématiques de l'IHÉS
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Valentin Poénaru, Corrado Tanasi (1995)
Annales de la Faculté des sciences de Toulouse : Mathématiques
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Felice Ronga (1998)
Banach Center Publications
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In a paper written in 1876 [4], Felix Klein gave a formula relating the number of real flexes of a generic real plane projective curve to the number of real bitangents at non-real points and the degree, which shows in particular that the number of real flexes cannot exceed one third of the total number of flexes. We show that Klein's arguments can be made rigorous using a little of the theory of singularities of maps, justifying in particular his resort to explicit examples. ...