Geodesic
Abelianization of the BGG resolution of representations of the Virasoro algebra
Funkcionalʹnyj analiz i ego priloženiâ, Tome 45 (2011) no. 4, pp. 72-81

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We construct a resolution that permits computing the $t$-character of representations of the Virasoro algebra from the $(2,2p+1)$-models, i.e., the characters of the associated graded spaces with respect to the Poincaré–Birkhoff–Witt filtration.
Keywords: Virasoro algebra, $t$-characters of irreducible representations, abelianization. 
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     author = {B. L. Feigin},
     title = {Abelianization of the {BGG} resolution of representations of the {Virasoro} algebra},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {72--81},
     publisher = {mathdoc},
     volume = {45},
     number = {4},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2011_45_4_a6/}
}
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B. L. Feigin. Abelianization of the BGG resolution of representations of the Virasoro algebra. Funkcionalʹnyj analiz i ego priloženiâ, Tome 45 (2011) no. 4, pp. 72-81. http://geodesic.mathdoc.fr/item/FAA_2011_45_4_a6/