Perverse coherent sheaves on blowup surfaces -- 
Hiraku Nakajima, February 22, 2008

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We consider moduli spaces of a certain class of coherent
sheaves on the blowup of a projective surface, called perverse
coherent sheaves. They connect usual moduli spaces of sheaves on the
blowup and on the original surface through wall-crossings. 

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I will give a description of moduli spaces for framed perverse coherent
sheaves on the blowup of the projective plane in terms of quivers.