Geodesic
KERNELS OF TOLERANCE RELATIONS
Acta mathematica Universitatis Comenianae, Tome 65 (1996) no. 2 
I. Chajda; G. Czedli; I. G. Rosenberg. KERNELS OF TOLERANCE RELATIONS. Acta mathematica Universitatis Comenianae, Tome 65 (1996) no. 2. http://geodesic.mathdoc.fr/item/AMUC_1996_65_2_a3/
@article{AMUC_1996_65_2_a3,
     author = {I. Chajda and G. Czedli and I. G. Rosenberg},
     title = {KERNELS {OF} {TOLERANCE} {RELATIONS}},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {1996},
     volume = {65},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/AMUC_1996_65_2_a3/}
}
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Voir la notice de l'article provenant de la source Comenius University

Algebras with 0 and their ideals in Gumm and Ursini's sense Ref. \GU, Ref. \U are considered. A variety $\K$ is called \emph$0$-tolerance regular if each tolerance relation $\al$ of any $A\in \K$ is uniquely determined by its kernel $[0]_\al=\set x\in A:\ll 0,x\rr\in \al.$. The main result, strengthening Agliano and Ursini Ref. \AU, asserts that every 0-tolerance regular variety is congruence permutable. Tolerance kernels of single algebras are also considered.