Wall's obstructions and Whitehead torsion.
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Slawomir Kwasik (1983)
Commentarii mathematici Helvetici
Paul C. Kainen (1971)
Mathematische Zeitschrift
Marie Demlová, Václav Koubek (2005)
Commentationes Mathematicae Universitatis Carolinae
In an earlier paper, the authors showed that standard semigroups , and play an important role in the classification of weaker versions of alg-universality of semigroup varieties. This paper shows that quasivarieties generated by and are neither relatively alg-universal nor -universal, while there do exist finite semigroups and generating the same semigroup variety as and respectively and the quasivarieties generated by and/or are quasivar-relatively -alg-universal and -universal...
Mark Teply, Blas Torrecillas (1998)
Colloquium Mathematicae
In [2], Fuchs and Viljoen introduced and classified the -modules for a valuation ring R: an R-module M is a -module if for each divisible module X and each torsion module X with bounded order. The concept of a -module was extended to the setting of a torsion theory over an associative ring in [14]. In the present paper, we use categorical methods to investigate the -modules for a group graded ring. Our most complete result (Theorem 4.10) characterizes -modules for a strongly graded ring R...
Kieboom, R.W., Sonck, G., Van der Linden, T., Witbooi, P.J. (2003)
Homology, Homotopy and Applications
Nguyêñ Quôć Thǎńg (2003)
Homology, Homotopy and Applications
Street, Ross (2009)
Theory and Applications of Categories [electronic only]
Yu. V. Selivanov (1996)
Extracta Mathematicae
S.H. Nienhuys-Cheng (1971)
Mathematische Zeitschrift
Marco Grandis (1997)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
Temple H. Fay (1996)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
J. Adámek, J. Rosický (1994)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
Martins-Ferreira, N. (2008)
Theory and Applications of Categories [electronic only]
J. Dukarm (1980)
Fundamenta Mathematicae
M. Carmen Minguez (1988)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
Picado, J. (1998)
Portugaliae Mathematica
Adamek, J., Rosicky, J., Vitale, E.M. (2010)
Theory and Applications of Categories [electronic only]
George Janelidze (1991)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
Jiří Adámek, Václav Koubek (1977)
Commentationes Mathematicae Universitatis Carolinae
Věra Kůrková-Pohlová, Václav Koubek (1974)
Commentationes Mathematicae Universitatis Carolinae
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