Extensions of usual and deform vertex algebras

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Extensions of usual and deform vertex algebras
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Feigin, Boris
Belavin, Alexander (Organization)
Nekrasov, Nikita (Organization)
Shatashvili, Samson (Organization)
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Institut des Hautes Études Scientifiques (IHÉS)
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There are two natural ways to constract the new vertex algebras.One -as subalgebra in the known one.Bosonisation is the special case of this construction.The second idea is opposite -to get the new algebras as exstensions ,in this case we add to vertex algebra some combination of vertex operators.We discuss several examples .Some of them are related with AGT bisiness.
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