Geodesic
Generalized Verma module homomorphisms in singular character
Archivum mathematicum, Tome 42 (2006) no. 5, pp. 229-240

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In this paper we study invariant differential operators on manifolds with a given parabolic structure. The model for the parabolic geometry is the quotient of the orthogonal group by a maximal parabolic subgroup corresponding to crossing of the $k$-th simple root of the Dynkin diagram. In particular, invariant differential operators discussed in the paper correspond (in a flat model) to the Dirac operator in several variables.
In this paper we study invariant differential operators on manifolds with a given parabolic structure. The model for the parabolic geometry is the quotient of the orthogonal group by a maximal parabolic subgroup corresponding to crossing of the $k$-th simple root of the Dynkin diagram. In particular, invariant differential operators discussed in the paper correspond (in a flat model) to the Dirac operator in several variables.
Classification : 22Exx, 58Jxx 
Franek, Peter. Generalized Verma module homomorphisms in singular character. Archivum mathematicum, Tome 42 (2006) no. 5, pp. 229-240. http://geodesic.mathdoc.fr/item/ARM_2006_42_5_a9/
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     title = {Generalized {Verma} module homomorphisms in singular character},
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     zbl = {1164.22310},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2006_42_5_a9/}
}
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