This paper studies a class of closed orientable
–manifolds
constructed from a gluing of three handlebodies, such that the inclusion of each handlebody
is
–injective.
This construction is the generalisation to handlebodies of the construction
for gluing three solid tori to produce non-Haken Seifert fibred
–manifolds
with infinite fundamental group. It is shown that there is an efficient algorithm
to decide if a gluing of handlebodies satisfies the disk-condition. Also, an
outline for the construction of the characteristic variety (JSJ decomposition)
in such manifolds is given. Some non-Haken and atoroidal examples are
given.
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