Holomorphic completions of affine Kac-Moody groups

We construct holomorphic loop groups and their associated affine Kac-Moody groups and prove that they are tame Fréchet manifolds. These results form the functional analytic basis for the theory of affine Kac-Moody symmetric spaces, presented first in the authors thesis. Our approach also solves completely the problem of complexification of loop groups; it allows a complete description of complex Kac-Moody groups and their non-compact real forms.

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