Geodesic
A Quick proof of Singhof's cat (M x S1) = cat (M) + 1 theorem.
Manuscripta mathematica, Tome 42 (1983), pp. 49-52

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Mots-clés : category of the product of a polyhedron with a sphere, Lyusternik- Shnirel'man category, k-skeleton of a polyhedron, dual skeleton 
@article{MM2_1983__42_154921,
     author = {Luis Montejano},
     title = {A {Quick} proof of {Singhof's} cat {(M} x {S1)} = cat {(M)} + 1 theorem.},
     journal = {Manuscripta mathematica},
     pages = {49--52},
     publisher = {mathdoc},
     volume = {42},
     year = {1983},
     zbl = {0639.55001},
     url = {http://geodesic.mathdoc.fr/item/MM2_1983__42_154921/}
}
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Luis Montejano. A Quick proof of Singhof's cat (M x S1) = cat (M) + 1 theorem.. Manuscripta mathematica, Tome 42 (1983), pp. 49-52. http://geodesic.mathdoc.fr/item/MM2_1983__42_154921/