Classification of spaces of locally convex curves in S n and combinatorics of the Weyl group D n + 1 Nicolau C . Saldanha and Boris Shapiro

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Classification of spaces of locally convex curves in S n and combinatorics of the Weyl group D n + 1 Nicolau C . Saldanha and Boris Shapiro March 22 , 2007

In 1920’s Marston Morse developed what is now known as Morse theory trying to study the topology of the space of closed curves on S2, see [7] and [5]. 80 years later a very similar problem about the topology of the space of closed and locally convex (i.e. without inflection points) curves on S2 is still widely open. The main difficulty is the absence of the covering homotopy principle for the m...

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Spaces of Locally Convex Curves in S and Combinatorics of the Group B

In the 1920’s Marston Morse developed what is now known as Morse theory trying to study the topology of the space of closed curves on S2 ([7], [5]). We propose to attack a very similar problem, which 80 years later remains open, about the topology of the space of closed curves on S2 which are locally convex (i.e., without inflection points). One of the main difficulties is the absence of the co...

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A smooth curve γ : [0, 1] → S2 is locally convex if its geodesic curvature is positive at every point. J. A. Little showed that the space of all locally convex curves γ with γ(0) = γ(1) = e1 and γ (0) = γ(1) = e2 has three connected components L−1,c, L+1, L−1,n. The space L−1,c is known to be contractible. In this paper we prove that L+1 and L−1,n are homotopy equivalent to ΩS3 ∨ S2 ∨ S6 ∨ S10 ...

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We discuss the homotopy type and the cohomology of spaces of locally convex parametrized curves γ : [0, 1] → S2, i.e., curves with positive geodesic curvature. The space of all such curves with γ(0) = γ(1) = e1 and γ′(0) = γ′(1) = e2 is known to have three connected components X−1,c, X1, X−1. We show several results concerning the homotopy type and cohomology of these spaces. In particular, X−1...

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تاریخ انتشار 2008