Geodesic
Lambek invariants in a~p-semi-abelian category
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 19 (2022) no. 1, pp. 332-341

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We consider the well-known invariants $\mathrm{Ker}$ and $\mathrm{Img}$ for commutative squares in P-semi-abelian categories. These invariants were introduced by Lambek for groups and then studied in a more general context by Hilton and Nomura. In this paper, P-semi-abelian analogs are proved for Lambek's isomorphism and acyclic sequences that include these invariants are found.
Keywords: P-semi-abelian category, commutative square
Mots-clés : Lambek invariants. 
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     title = {Lambek invariants in a~p-semi-abelian category},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
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Ya. A. Kopylov. Lambek invariants in a~p-semi-abelian category. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 19 (2022) no. 1, pp. 332-341. http://geodesic.mathdoc.fr/item/SEMR_2022_19_1_a13/