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Article

Pursuing the double affine Grassmannian III: Convolution with affine Zastava

Moscow Mathematical Journal. 2013. Vol. 13. No. 2. P. 233-265.
Braverman A., Michael Finkelberg.

This is the third paper in a series which describes a conjectural analogue of the affine Grassmannian for affine Kac-Moody groups (also known as the double affine Grassmannian).  The present paper is dedicated to the description of the conjectural analogue of the convolution diagram for the double affine Grassmannian and affine zastava.