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- W4311474682 abstract "Our investigation in the present paper is based on three important results. (1) In [14], Ringel introduced Hall algebra for representations of a quiver over finite fields and proved the elements corresponding to simple representations satisfy the quantum Serre relation. This gives a realization of the nilpotent part of quantum group if the quiver is of finite type. (2) In [6], Green found a homological formula for the representation category of the quiver and equipped Ringel's Hall algebra with a comultiplication. The generic form of the composition subalgebra of Hall algebra generated by simple representations realizes the nilpotent part of quantum group of any type. (3) In [11], Lusztig defined induction and restriction functors for the perverse sheaves on the variety of representations of the quiver which occur in the direct images of constant sheaves on flag varieties, and he found a formula between his induction and restriction functors which gives the comultiplication as algebra homomorphism for quantum group. In the present paper, we prove the formula holds for all semisimple complexes with Weil structure. This establishes the categorification of Green's formula." @default.
- W4311474682 created "2022-12-26" @default.
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- W4311474682 date "2023-03-01" @default.
- W4311474682 modified "2023-10-02" @default.
- W4311474682 title "The parity of Lusztig's restriction functor and Green's formula" @default.
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- W4311474682 doi "https://doi.org/10.1016/j.jalgebra.2022.11.017" @default.
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