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In this note we make several observations concerning symplectic fillings. In particular
we show that a (strongly or weakly) semi-fillable contact structure is fillable and any
filling embeds as a symplectic domain in a closed symplectic manifold. We also
relate properties of the open book decomposition of a contact manifold to its
possible fillings. These results are also useful in proving property P for knots [P
Kronheimer and T Mrowka, Geometry and Topology, 8 (2004) 295–310] and in
showing the contact Heegaard Floer invariant of a fillable contact structure
does not vanish [P Ozsvath and Z Szabo, Geometry and Topology, 8 (2004)
311–334].
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