A Character Formula for Representations of Loop Groups Based by Wendt R.

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We have to distinguish two cases. First, let us suppose that for any simple root α ∈ , the roots α and σc (α) are not connected in the Dynkin diagram of . In this case, one can easily show that σc (eα ) = eσc (α) , so that s(α) = 1 for all real roots α ∈ re . For any root α ∈ let us denote by ασc its restriction to the subspace hσc ⊂ h. Then the set {mα ασc | α ∈ re } is the set of real roots of an affine root system which we will denote by σc . Now suppose that there exists some α ∈ such that α = σc (α) are not orthogonal.

J. : The action of Outer Automorphisms on Bundles of Chiral Blocks. Comm. Math. Phys. : From Dynkin diagram symmetries to fixed point structures. Comm. Math. Phys. : The arithmetic theory of loop algebras. J. : The arithmetic theory of loop groups. Publ. Math. : Structure of unitary cocycle representations of loop groups and the group of diffeomorphisms of the circle. J. Reine Angew. Math. : On unstable bundles over elliptic curves. Publ. Res. Inst. Math. Sci. : Infinite-dimensional Lie Algebras.

We have to distinguish two cases. First, let us suppose that for any simple root α ∈ , the roots α and σc (α) are not connected in the Dynkin diagram of . In this case, one can easily show that σc (eα ) = eσc (α) , so that s(α) = 1 for all real roots α ∈ re . For any root α ∈ let us denote by ασc its restriction to the subspace hσc ⊂ h. Then the set {mα ασc | α ∈ re } is the set of real roots of an affine root system which we will denote by σc . Now suppose that there exists some α ∈ such that α = σc (α) are not orthogonal.

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