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We calculate the Heegaard Floer homologies HF+(M,s)
for mapping tori M associated to certain surface diffeomorphisms,
where s is any spinc structure on M
whose first Chern class is non-torsion. Let γ and δ
be a pair of geometrically dual nonseparating curves on a genus g
Riemann surface Σg, and let σ be a curve separating
Σg into components of genus 1 and g-1. Write tγ,
tδ, and tσ for the right-handed Dehn twists about each
of these curves. The examples we consider are the mapping tori of the
diffeomorphisms tγm∘tδn for m,n in Z
and that of tσ±1.
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