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In this paper, we consider the subdivision map between two KLRW algebras of type A^ (1) ₑ and A^ (1) ₄+₁. We show that the image of an idempotent indexed by a partition under this map is still an idempotent indexed by a partition, and give the form of this new partition. Moreover, we give an equality of some graded decomposition numbers.
Tao Qin (Thu,) studied this question.