189,568 research outputs found
The homology of Peiffer products of groups
No full textThe Peiffer product of groups first arose in work of J.H.C. White-head on the structure of relative homotopy groups, and is closely related to problems of asphericity for two-complexes. We develop algebraic methods for computing the second integral homology of a Peiffer product. We show that a Peiffer product of superperfect groups is superperfect, and determine when a Peiffer product of cyclic groups has trivial second homology. We also introduce a double wreath product as a Peiffer product.</p
Teesing (H. P. H.). Das Problem des Perioden in der Literaturgeschichte
No full textPeiffer J. Teesing (H. P. H.). Das Problem des Perioden in der Literaturgeschichte. In: Revue belge de philologie et d'histoire, tome 29, fasc. 1, 1951. pp. 167-171
Teesing (H. P. H.). Das Problem des Perioden in der Literaturgeschichte
No full textPeiffer J. Teesing (H. P. H.). Das Problem des Perioden in der Literaturgeschichte. In: Revue belge de philologie et d'histoire, tome 29, fasc. 1, 1951. pp. 167-171
Test de Rorschach et Noirs hanséniens, par E. Peiffer
No full textStora R. Test de Rorschach et Noirs hanséniens, par E. Peiffer. In: Bulletin du groupement français du Rorschach, n°10, 1958. p. 72
Test de Rorschach et Noirs hanséniens, par E. Peiffer
No full textStora R. Test de Rorschach et Noirs hanséniens, par E. Peiffer. In: Bulletin du groupement français du Rorschach, n°10, 1958. p. 72
Traduction française de la table des matières de Apidologie, 2021, Vol 52, n° 1
No full textTraduction française de la table des matières de Apidologie, 2021, Vol 52, n° 1, 5 p. Version anglaise https://link.springer.com/journal/13592/volumes-and-issues/52-1 (consulté le 21 avril 2021).
French translation of the table of content of Apidologie, 2021, Vol 52, Issue 1, 5 p. English version https://link.springer.com/journal/13592/volumes-and-issues/52-1 (accessed 21 April 2021)
E. Peiffer : Données obtenues au test de Rorschach chez des Noirs d'Afrique occidentale française
No full textRausch de Traubenberg Nina. E. Peiffer : Données obtenues au test de Rorschach chez des Noirs d'Afrique occidentale française. In: Bulletin de la Société française du Rorschach et des méthodes projectives, n°13-14, 1962. p. 85
Scholarly Journals in Early Modern Europe. Communication and the Construction of Knowledge
No full textPeiffer elements in simplicial groups and algebras
No full textAbstractThe main objective of this paper is to prove in full generality the following two facts:A. For an operad O in Ab, let A be a simplicial O-algebra such that Am is generated as an O-ideal by (∑i=0m−1si(Am−1)), for m>1, and let NA be the Moore complex of A. Thend(NmA)=∑Iγ(Op⊗⋂i∈I1kerdi⊗⋯⊗⋂i∈Ipkerdi)where the sum runs over those partitions of [m−1], I=(I1,…,Ip), p≥1, and γ is the action of O on A.B. Let G be a simplicial group with Moore complex NG in which Gn is generated as a normal subgroup by the degenerate elements in dimension n>1, then d(NnG)=∏I,J[⋂i∈Ikerdi,⋂j∈Jkerdj], for I,J⊆[n−1] with I∪J=[n−1].In both cases, di is the i-th face of the corresponding simplicial object.The former result completes and generalizes results from Akça and Arvasi [I. Akça, Z. Arvasi, Simplicial and crossed Lie algebras, Homology Homotopy Appl. 4 (1) (2002) 43–57], and Arvasi and Porter [Z. Arvasi, T. Porter, Higher dimensional Peiffer elements in simplicial commutative algebras, Theory Appl. Categ. 3 (1) (1997) 1–23]; the latter completes a result from Mutlu and Porter [A. Mutlu, T. Porter, Applications of Peiffer pairings in the Moore complex of a simplicial group, Theory Appl. Categ. 4 (7) (1998) 148–173]. Our approach to the problem is different from that of the cited works. We have first succeeded with a proof for the case of algebras over an operad by introducing a different description of the inverse of the normalization functor N:AbΔop→Ch≥0. For the case of simplicial groups, we have then adapted the construction for the inverse equivalence used for algebras to get a simplicial group NG⊠Λ from the Moore complex NG of a simplicial group G. This construction could be of interest in itself
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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