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Stable bundles and differentiable structures on certain elliptic surfaces. (English) Zbl 0613.14018
The authors extend a result of S. K. Donaldson [C. R. Acad. Sci., Paris, Sér. I 301, 317-320 (1985; Zbl 0584.57010)] that shows that a rational elliptic surface obtained from the projective plane by blowing up 9 base points of a pencil of cubic curves is not diffeomorphic to its homogeneous space $$X_{2,q}$$ with two multiple fibres of $$multiplicity^ 2$$ and odd q. The fact that the both surfaces are simply-connected and homotopy equivalent was observed earlier by the reviewer. Using a similar technique based on computation of Donaldson’s invariant, the authors show that for two prime numbers p and q the surfaces $$X_{2,q}$$ and $$X_{2,p}$$ are diffeomorphic if and only if $$p=q$$. A more general result about the diffeomorphy of surfaces $$X_{p,q}$$ was independently obtained by R. Friedman and J. Morgan (to appear).
Reviewer: I.Dolgachev

##### MSC:
 14F45 Topological properties in algebraic geometry 57R55 Differentiable structures in differential topology 14F05 Sheaves, derived categories of sheaves, etc. (MSC2010) 14J25 Special surfaces 57R50 Differential topological aspects of diffeomorphisms
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##### References:
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