arXiv · dg-ga/9702003
We show that the manifold *CP^2 # *RP^4, which is homotopy equivalent but not homeomorphic to CP^2 # RP^4, is in fact smoothable.
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Daniel Ruberman, Ronald J. Stern. 1997-02-07. A fake smooth CP^2 # RP^4. https://arxiv.org/abs/dg-ga/9702003
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