Graph manifolds have virtually positive Seifert volume
نویسندگان
چکیده
This paper shows that the Seifert volume of each closed non-trivial graph manifold is virtually positive. As a consequence, for each closed orientable prime 3-manifold N , the set of mapping degrees D(M,N) is finite for any 3-manifold M , unless N is finitely covered by either a torus bundle, or a trivial circle bundle, or the 3-sphere.
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ورودعنوان ژورنال:
- J. London Math. Society
دوره 86 شماره
صفحات -
تاریخ انتشار 2012