Geodesic
On derivations over rings of triangular matrices
Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 30 (2005) no. 1
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The purpose of this article is to describe the structure of derivations over general rings of upper or lower triangular matrices. Some examples are developed, together with a simple formula that gives the dimension of the module of derivations on the center of the underlying ring. 
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     title = {On derivations over rings of triangular matrices},
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     pages = {77 - 84},
     year = {2005},
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A. L. Barrenechea; C. C. Pena. On derivations over rings of triangular matrices. Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 30 (2005) no. 1. http://geodesic.mathdoc.fr/item/BASS_2005_30_1_a5/