W. A. de Graaf
Published 2002-12-11, updated 2004-04-05Version 2
A practical method for constructing a nontrivial homomorphsim between Verma modules is described.
Comments: 15 pages, added references, some comments on the affine case, an application concerning the construction of irreducible modules
On Extensions Between Verma Modules
Extensions between Verma modules for dihedral groups
First extension groups of Verma modules and $R$-polynomials
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