Geodesic
Singular operators satisfying an intertwining relation
Teoretičeskaâ i matematičeskaâ fizika, Tome 121 (1999) no. 2, pp. 264-270

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An intertwining relation between the Beltrami–Laplace operator with an added potential and the Beltrami–Laplace operator is considered on a Riemannian manifold. It is shown that the potential singularities of codimension one form completely geodesic hypersurfaces. 
@article{TMF_1999_121_2_a3,
     author = {M. V. Feigin},
     title = {Singular operators satisfying an intertwining relation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {264--270},
     publisher = {mathdoc},
     volume = {121},
     number = {2},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1999_121_2_a3/}
}
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M. V. Feigin. Singular operators satisfying an intertwining relation. Teoretičeskaâ i matematičeskaâ fizika, Tome 121 (1999) no. 2, pp. 264-270. http://geodesic.mathdoc.fr/item/TMF_1999_121_2_a3/