In this paper the concepts of mixed cartesian square and quasi-cocartesian square, already known in the category of groups, are adapted to the category of Lie algebras. These concepts can be used in the study of the obstructions of Lie algebra extensions in the same way that Wu has studied the obstructions of group extensions.
@article{urn:eudml:doc:38858,
title = {Cuadrados especiales en la categor\'\i a de \'algebras de Lie.},
journal = {Stochastica},
volume = {6},
year = {1982},
pages = {137-147},
zbl = {0539.18001},
mrnumber = {MR0691620},
language = {es},
url = {http://dml.mathdoc.fr/item/urn:eudml:doc:38858}
}
Tarazona, Daniel. Cuadrados especiales en la categoría de álgebras de Lie.. Stochastica, Tome 6 (1982) pp. 137-147. http://gdmltest.u-ga.fr/item/urn:eudml:doc:38858/