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- W2949209323 abstract "For a continuous map on a topological graph containing a unique loop S it is possible to define the degree and, for a map of degree 1, rotation numbers. It is known that the set of rotation numbers of points in S is a compact interval and for every rational r in this interval there exists a periodic point of rotation number r. The whole rotation set (i.e. the set of all rotation numbers) may not be connected and it is not known in general whether it is closed. The graph sigma is the space consisting in an interval attached by one of its endpoints to a circle. We show that, for a map of degree 1 on the graph sigma, the rotation set is closed and has finitely many connected components. Moreover, for all rational numbers r in the rotation set, there exists a periodic point of rotation number r." @default.
- W2949209323 created "2019-06-27" @default.
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- W2949209323 date "2007-12-21" @default.
- W2949209323 modified "2023-09-27" @default.
- W2949209323 title "Rotation set for maps of degree 1 on the graph sigma" @default.
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