We give an action of a Lie subalgebra of the Witt algebra on foams. This action is compatible with the glN -foam evaluation formula. In particular, this endows states spaces associated with glN -webs with an sl₂ -action. When working in positive characteristic, this can be used to define a p -DG structure on these state spaces.
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Qi et al. (2024) studied this question.
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