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The structure of a solvmanifold's Heegaard splittings (Joint with Daryl Cooper)
Geometry/Topology| Speaker: | Martin Scharlemann, UCSB |
| Location: | 693 Kerr |
| Start time: | Wed, Feb 10 1999, 4:10PM |
Description
We classify isotopy classes of irreducible Heegaard splittings of
solvmanifolds. If the monodromy of the solvmanifold can be expressed as
a matrix with a zero in the right hand bottom corner and a plus or minus m,
m no less than 3, in the upper left (as always is true when the trace of
the monodromy is plus or minus 3), then any irreducible splitting is
strongly irreducible and of genus two. If m is no less than 4 then any two
such splittings are isotopic. If m = 3 then, up to isotopy, there are
exactly
two irreducible splittings, their associated hyperelliptic involutions
commute, and their product is the central involution of the solvmanifold.
If the monodromy cannot be expressed in the form above then the splitting
is weakly reducible, of genus three and unique up to isotopy.