Communications in Algebra
Category O, Extensions, Verma modules
Gabber and Joseph introduced a ladder diagram between two natural sequences of extensions. Their diagram is used to produce a `twisted' sequence that is applied to old and new results on extension groups in category O.
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Carlin, Kevin J., "Twisted Sequences of Extensions" (2020). Mathematics and Computer Science Department Faculty Works. 1.
Available for download on Thursday, March 18, 2021