A note on exactness and stability in homotopical algebra.
A note on Kieboom's pullback theorem for cofibrations
A Pullback theorem for cofibrations.
A Pullback Theorem for Locally-Equiconnected Spaces.
Chain homotopy pullbacks and pushouts
Cofibrations and bicofibrations for C*-algebras.
Commuting Homotopy Limits.
Contractibility and a generalization of absolute extensor
Diagonal fibrations are pointwise fibrations.
Ein elementarer Zugang zur Leray-Schauder-Theorie
Equalizers and coactions of groups
If f:G → H is a group homomorphism and p,q are the projections from the free product G*H onto its factors G and H respectively, let the group be the equalizer of fp and q:G*H → H. Then p restricts to an epimorphism . A right inverse (section) of is called a coaction on G. In this paper we study and the sections of . We consider the following topics: the structure of as a free product, the restrictions on G resulting from the existence of a coaction, maps of coactions and the resulting...
Equiconnectivity and Cofibrations I.
Exact sequences of spaces - II
Fibrations and Cofibred Pairs.
Functors between homotopy theories
Generalized homotopy theory.
Groupoid Operations and Fibre-Homotopy Equivalence. I.
Homotopy Limits and Colimits.
Homotopy theory induced by cones.
L’espace classifiant de la -théorie algébrique