Affine action

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Let be the Weyl group of a semisimple Lie algebra (associate to fixed choice of a Cartan subalgebra ). Assume that a set of simple roots in is chosen.

The affine action (also called the dot action) of the Weyl group on the space is

where is the sum of all fundamental weights, or, equivalently, the half of the sum of all positive roots.

References[edit]

  • Baston, Robert J.; Eastwood, Michael G. (1989), The Penrose Transform: its Interaction with Representation Theory, Oxford University Press.