Geodesic
Conjugation in the incidence algebras
Fundamentalʹnaâ i prikladnaâ matematika, Tome 8 (2002) no. 2, pp. 627-630

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We introduce the notion of the canonical form of an incidence function that generalizes the Jordan cell, and we find the canonical forms for some functions. In particular, the canonical form of the zeta-function in some incidence algebras is found. 
@article{FPM_2002_8_2_a16,
     author = {V. E. Marenich},
     title = {Conjugation in the incidence algebras},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {627--630},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2002_8_2_a16/}
}
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V. E. Marenich. Conjugation in the incidence algebras. Fundamentalʹnaâ i prikladnaâ matematika, Tome 8 (2002) no. 2, pp. 627-630. http://geodesic.mathdoc.fr/item/FPM_2002_8_2_a16/