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math.DG1998
Embedded surfaces and almost complex structures
Christian Bohr
We prove necessary and sufficient conditions for a smooth surface in a 4-manifold X to be pseudoholomorphic with respect to some almost complex structure on X. This provides a syst…
math.AT1998
On the relation between lifting obstructions and ordinary obstructions
Christian Bohr
We consider partial liftings of maps at fibrations and compare the primary obstruction to extend the lifting with the obstruction to extend the lifting as a simple map into the tot…