Abstract
Let X be a closed, simply-connected, smooth, spin 4-manifold whose intersection form is isomorphic to 2k(−E s ) ⊕ lH, where H is the hyperbolic form. In this paper, the authors prove that if there exists a locally linear pseudofree ℤ3-action on X, then Sign(g,X) ≡ −k mod 3. They also investigate the smoothability of locally linear ℤ3-action satisfying above congruence. In particular, it is proved that there exist some nonsmoothable locally linear ℤ3-actions on certain elliptic surfaces.
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The work was supported by the National Natural Science Foundation of China (Nos. 11371076, 11431009) and the Natural Science Foundation of Hebei Province of China (No.A2014501040).
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Liu, X., Xue, C. On ℤ3-actions on spin 4-manifolds. Chin. Ann. Math. Ser. B 38, 1303–1310 (2017). https://doi.org/10.1007/s11401-017-1038-0
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DOI: https://doi.org/10.1007/s11401-017-1038-0