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Sur une opérade ternaire liée aux treillis de Tamari

Frédéric Chapoton (2011)

Annales de la faculté des sciences de Toulouse Mathématiques

On introduit une opérade anticyclique V définie par une présentation ternaire quadratique. On montre qu’elle admet une base indexée par les arbres binaires planaires. On relie cette construction à la famille des treillis de Tamari ( Y n ) n 0 en construisant un isomorphisme entre V ( 2 n + 1 ) et le groupe de Grothendieck de la catégorie mod Y n qui envoie la base de V ( 2 n + 1 ) sur les classes des modules projectifs et qui transforme la structure anticyclique de V en la transformation de Coxeter de la catégorie dérivée de mod Y n . La dualité...

SV and related f -rings and spaces

Suzanne Larson (2010)

Annales de la faculté des sciences de Toulouse Mathématiques

An f -ring A is an SV f -ring if for every minimal prime -ideal P of A , A / P is a valuation domain. A topological space X is an SV space if C ( X ) is an SV f -ring. SV f -rings and spaces were introduced in [HW1], [HW2]. Since then a number of articles on SV f -rings and spaces and on related f -rings and spaces have appeared. This article surveys what is known about these f -rings and spaces and introduces a number of new results that help to clarify the relationship between SV f -rings and spaces and related...

Symmetric difference on orthomodular lattices and Z 2 -valued states

Milan Matoušek, Pavel Pták (2009)

Commentationes Mathematicae Universitatis Carolinae

The investigation of orthocomplemented lattices with a symmetric difference initiated the following question: Which orthomodular lattice can be embedded in an orthomodular lattice that allows for a symmetric difference? In this paper we present a necessary condition for such an embedding to exist. The condition is expressed in terms of Z 2 -valued states and enables one, as a consequence, to clarify the situation in the important case of the lattice of projections in a Hilbert space.

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