D - branes , Orbifolds , and Ext groups
نویسنده
چکیده
Sheldon Katz, Tony Pantev, and Eric Sharpe 1 Department of Mathematics 1409 W. Green St., MC-382 University of Illinois Urbana, IL 61801 2 Department of Physics University of Illinois at Urbana-Champaign Urbana, IL 61801 3 Department of Mathematics University of Pennsylvania David Rittenhouse Lab. 209 South 33rd Street Philadelphia, PA 19104-6395 [email protected], [email protected], [email protected]
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