If $w$ is a Weyl group element of a simple lie algebra and the reduced expression for $w$ is $s_{i_1}s_{i_2}...s_{i_k}$ what are the positive roots (in terms of reflections from reduced expressions of $w$ applied to some simple roots) made negative by $w$ ?
2026-04-01 17:05:09.1775063109
set of positive roots made negative by a Weyl group element
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