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Dolgachev surface
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<p>In mathematics, Dolgachev surfaces are certain <a href="/facts/Simply_connected_space/xFlta63J">simply connected</a> <a href="/facts/Elliptic_surface/XRDYGhYb">elliptic surfaces</a>, introduced by <a href="/facts/Igor_Dolgachev/m41sXYMB">Igor Dolgachev</a> (1981). They can be used to give examples of an infinite family of <a href="/facts/Homeomorphism/jMfWg3Mn">homeomorphic</a> simply connected <a href="/facts/Compact_space/d0cgXJH7">compact</a> <a href="/facts/4-manifold/XwVxwqnr">4-manifolds</a>, no two of which are <a href="/facts/Diffeomorphism/855N5YYj">diffeomorphic</a>. </p>