Revision history of "Representing homology classes by embedded 2-spheres (Ex)"

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  • (cur | prev) 06:37, 8 January 2019‎ Jfdavis (Talk | contribs)‎ (603 bytes) (Created page with "<wikitex>; # Find a class $x \in H_2( 8 {\mathbb C} P ^2 \# \overline{ {\mathbb C} P^2)} $ so that $x \cdot x = -1$ which cannot be represented by a smoothly embedded 2-spher...")
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