Abstract
Let f, g: \({S^{m}\rightarrow S^{2n}}\) be a pair of maps between spheres. We further explore previous results about the coincidence of a pair of maps between spheres. We give special attention to the case of self-coincidence (i.e., (f, f): \({M \rightarrow S^{2n}}\)) in which we consider the question of making the pair homotopy disjoint by a small deformation whenever the pair can be made coincidence free. When M is the sphere \({S^{4n-2}}\), we basically update the results from [C. R. Acad. Sci. Paris Ser. I 342 (2006), 511–513] based on the new results of the Kervaire invariant one problem. When M is either the sphere \({S^{4n-1}}\) or the sphere S 4n, we classify all pairs (\({f_{1}, f_{2}}\)) which are homotopy disjoint; and for maps f such that (f, f) can be deformed to coincidence free, the ones such that (f, f) can be deformed to coincidence free by a small deformation. Finally, we give families of functions \({h_{t} t \in \mathbb{N}}\) such that (\({h_{t},h_{t}}\)) is homotopy disjoint but not by a small deformation.
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Gonçalves, D.L., Randall, D. Coincidence and self-coincidence of maps between spheres. J. Fixed Point Theory Appl. 19, 1011–1040 (2017). https://doi.org/10.1007/s11784-016-0376-y
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DOI: https://doi.org/10.1007/s11784-016-0376-y