Wall's obstructions and Whitehead torsion.
Weak Adjoint Functors.
Weak alg-universality and -universality of semigroup quasivarieties
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...
Weak Baer modules over graded rings
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...
Weak cofibrations in categories of cofibrant objects.
Weak corestriction principle for non-Abelian Galois cohomology.
Weak distributive laws.
Weak homological bidimension and its values in the class of biflat Banach algebras.
Weak Homotopy Category of a Category with a Cotriple.
Weak subobjects and weak limits in categories and homotopy categories
Weakly hereditary regular closure operators
Weakly locally presentable categories
Weakly Mal'cev categories.
Weakly monadic Boolean extension functors
Wedge product of forms in synthetic differential geometry
Weil nearness spaces.
What are sifted colimits?
What is a double central extension ? (the question was asked by Ronald Brown)
What to embed into a Cartesian closed topological category (Preliminary communication)
When a generalized algebraic category is monadic