Results 231 to 240 of about 4,040 (274)
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Relation algebra with multi-relations
International Journal of Computer Mathematics, 1998This report proposes a theory of multi-relations, which are similar to normal mathematical relations, except for the fact that each tuple has a given multiplicity. It is shown that most of the set-oriented operations on relations, such as union and intersection can be generalised (in the same way in which sets can be generalised to multisets).
Feijs, L.M.G., Krikhaar, R.L.
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Relational Contexts and Relational Concepts
Fundamenta Informaticae, 2010Formal concept analysis (FCA) is a mathematical description and theory of concepts implied in formal contexts. And the current formal contexts of FCA aim to model the binary relations between individuals (objects) and attributes in the real world. In the real world we usually describe each individual by some attributes, which induces the relations ...
Feng Jiang, Yuefei Sui, Cungen Cao
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All hyperbolic cyclically presented groups with positive length three relators
Journal of Pure and Applied AlgebraWe consider the cyclically presented groups defined by cyclic presentations with $2m$ generators $x_i$ whose relators are the $2m$ positive length three relators $x_ix_{i+1}x_{i+m-1}$. We show that they are hyperbolic if and only if $m\in \{1,2,3,6,9\}$.
Ihechukwu Chinyere, Gerald Williams
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The clone relation of a binary relation
Information Sciences, 2017zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Hassane Bouremel +3 more
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On Normalization of Relations in Relational Databases
Programming and Computer Software, 2002zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Relational Databases with Ordered Relations
Logic Journal of the IGPL, 2005Summary: The paper deals with expressing preferences in the framework of the relational data model. Preferences have usually a form of a partial ordering. Therefore the question arises how to provide the relational data model with such an ordering.
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2020
Identifies and explores the concept of relation in Balibar’s work and offers a genealogical account of the “ontology of relation.”
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Identifies and explores the concept of relation in Balibar’s work and offers a genealogical account of the “ontology of relation.”
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RELATED DISEASE—RELATED CAUSE?
The Lancet, 1969Abstract A constant relationship between certain Summary diseases in different geographical areas or in different socio-economic groups suggests some related aetiological factor. Benign and malignant lesions of the large bowel which show such a relationship are examined, and it is suggested that there is epidemiological and other evidence to ...
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Relational Computation of Sets of Relations
2021We present a technique for the relational computation of sets \(\mathcal {R}\) of relations. It is based on a specification of a relation R to belong to \(\mathcal {R}\) by means of an inclusion \(\mathfrak {s}\,\subseteq \,\mathfrak {t}\), where \(\mathfrak {s}\) and \(\mathfrak {t}\) are relation-algebraic expressions constructed from a vector model ...
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