Finding fibre faces in finite covers
نویسندگان
چکیده
A well-known conjecture about closed hyperbolic 3-manifolds asserts that the first Betti number can be increased without bound by passage to finite sheeted covers. If the manifold is fibred, a strengthening of this conjecture is that the number of fibred faces (see §2.1 for the definition of a fibred face) of the unit ball of the Thurston norm can be made arbitrarily large by passage to finite sheeted covers. The main result of this note is the following.
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