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Is there any relation between AGT conjecture 0906.3219 and the 4d-2d correspondence of 1006.3435 ?

For pure SYM of $\mathcal{N}=2$ , SU(2) guage group thoery, we know the explicit instanton partition function, can we read BPS spectrum from instanton partition function? Is there wall-crossing effect for instanton partition function?

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The subject matter sounds interesting, but to make it a useful MO question it would be very helpful to add some explanations and context about the conjecture and correspondence in question. –  David Ben-Zvi May 10 '11 at 16:35
    
I agree with David's comment. By the way, it seems that all these correspondances people are interested in are the shadow of a to-be-constructed-theory in 6d. –  DamienC May 18 '11 at 11:11

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