Contractions of group representations. Pt. II

As a development of a preceding paper, the representations of projective Lie algebras by contraction of representations of vector algebras of the same dimension is obtained. As examples, the projective representations of the Galilei unidimensional group and of IO2 is deduced. In addition, it is discussed the possibility that the use of the contraction allows to classify completely the Lie groups and their representations. (author)