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A duality between infinitary varieties and algebraic theories

Jiří Adámek, Václav Koubek, Jiří Velebil (2000)

Commentationes Mathematicae Universitatis Carolinae

A duality between λ -ary varieties and λ -ary algebraic theories is proved as a direct generalization of the finitary case studied by the first author, F.W. Lawvere and J. Rosick’y. We also prove that for every uncountable cardinal λ , whenever λ -small products commute with 𝒟 -colimits in Set , then 𝒟 must be a λ -filtered category. We nevertheless introduce the concept of λ -sifted colimits so that morphisms between λ -ary varieties (defined to be λ -ary, regular right adjoints) are precisely the functors...

A factorization of quasiorder hypergroups

Ivan Chajda, Šárka Hošková (2004)

Commentationes Mathematicae Universitatis Carolinae

The contribution is devoted to the question of the interchange of the construction of a quasiorder hypergroup from a quasiordered set and the factorization.

A faithful linear-categorical action of the mapping class group of a surface with boundary

Robert Lipshitz, Peter Ozsváth, Dylan P. Thurston (2013)

Journal of the European Mathematical Society

We show that the action of the mapping class group on bordered Floer homology in the second to extremal spin c -structure is faithful. This paper is designed partly as an introduction to the subject, and much of it should be readable without a background in Floer homology.

A Generalization of Baer's Lemma

Molly Dunkum (2009)

Czechoslovak Mathematical Journal

There is a classical result known as Baer’s Lemma that states that an R -module E is injective if it is injective for R . This means that if a map from a submodule of R , that is, from a left ideal L of R to E can always be extended to R , then a map to E from a submodule A of any R -module B can be extended to B ; in other words, E is injective. In this paper, we generalize this result to the category q ω consisting of the representations of an infinite line quiver. This generalization of Baer’s Lemma...

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