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Past exam of the mathematics course of the University of Cambridge / 2005 / iii / Paper 2 / 2 / ii / a

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2005 iii Paper 2 2 ii
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a
For the Adjoint representation, the root-space decomposition gives the eight nonzero weights
±2L1​,±2L2​,±L1​±L2​,
(1)
each of multiplicity one, and weight zero of multiplicity two from the Cartan subalgebra. Thus its weight diagram is the root diagram with a double zero weight, and its total dimension is 8+2=10.
Figure 1.
Adjoint sp4 weights: the eight roots and the zero weight of multiplicity two
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