Building upon our early work, we construct infinitely many new smooth structures on closed simply connected spin 4-manifolds with nonnegative signature.
Bibliographical noteFunding Information:
The first author was partially supported by Simons Research Fellowship and Collaboration Grant for Mathematicians from the Simons Foundation . The second author was partially supported by an NSERC discovery grant ( 261491 ). The authors thank F. Catanese and S. Rollenske for valuable e-mail exchanges regarding their work  .
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