Geodesic
On the number of connected and disconnected coverings over a manifold
Ars Mathematica Contemporanea, Tome 2 (2009) no. 2, pp. 181-189.

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A general formula is obtained for the number of non-equivalent coverings (possibly disconnected) over a connected manifold with an arbitrary finitely generated fundamental group. Some illustrative examples are considered.
DOI : 10.26493/1855-3974.98.ecc
Keywords: Counting of homomorphisms, Non-equivalent coverings, Disconnected coverings, Fundamental group, Euler transform 
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Valery A. Liskovets; Alexander D. Mednykh. On the number of connected and disconnected coverings over a manifold. Ars Mathematica Contemporanea, Tome 2 (2009) no. 2, pp. 181-189. doi : 10.26493/1855-3974.98.ecc. http://geodesic.mathdoc.fr/articles/10.26493/1855-3974.98.ecc/

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