Positivity of Canonical Bases under Comultiplication
classification
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positivitybasiscanonicalcomultiplicationunderaffinebasescoideal
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We show the positivity of the canonical basis for a modified quantum affine $\mathfrak{sl}_n$ under the comultiplication. Moreover, we establish the positivity of the i-canonical basis in [LW15] with respect to the coideal subalgebra structure.
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