Curvature-torsion quasitensor of Laptev fundamental-group connection
- DOI
- 10.5922/0321-4796-2020-51-17
- Pages
- 156-169
Abstract
We consider a space with Laptev's fundamental group connection generalizing spaces with Cartan connections. Laptev structural equations are reduced to a simpler form. The continuation of the given structural equations made it possible to find differential comparisons for the coefficients in these equations. It is proved that one part of these coefficients forms a tensor, and the other part forms is quasitensor, which justifies the name quasitensor of torsion-curvature for the entire set. From differential congruences for the components of this quasitensor, congruences are obtained for the components of the Laptev curvature-torsion tensor, which contains 9 subtensors included in the unreduced structural equations.
In two special cases, a space with a fundamental connection is a space with a Cartan connection, having a quasitensor of torsion-curvature, which contains a quasitensor of torsion. In the reductive case, the space of the Cartan connection is turned into such a principal bundle with connection that has not only a curvature tensor, but also a torsion tensor.
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