Symplectic non-Hamiltonian circle actions on compact connected 4-manifolds with discrete period group are classified up to equivariant symplectomorphism by seven invariants.
4-dimensional symplectic S1-manifolds admitting mo- ment map
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Classification of symplectic non-Hamiltonian circle actions on 4-manifolds
Symplectic non-Hamiltonian circle actions on compact connected 4-manifolds with discrete period group are classified up to equivariant symplectomorphism by seven invariants.