On lattices of congruences of relational systems and universal algebras

1981 ◽  
Vol 13 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Jerzy Płonka
Keyword(s):  
Universal Algebras ◽  
Relational Systems

On a product of universal relational systems

2020 ◽  
Vol Accepted ◽  
Author(s):  
Nitima Phrommarat ◽  
Sivaree Sudsanit
Keyword(s):  
Relational Systems

Using the co-existence approach to achieve combined functionality of object-oriented and relational systems

1993 ◽  
Vol 22 (2) ◽  
pp. 109-118 ◽  
Author(s):  
R. Ananthanarayanan ◽  
V. Gottemukkala ◽  
W. Kaefer ◽  
T. J. Lehman ◽  
H. Pirahesh
Keyword(s):  
Object Oriented ◽  
Relational Systems

Weak Products of Simple Universal Algebras

1969 ◽  
Vol 42 (1-3) ◽  
pp. 157-171 ◽  
Author(s):  
Tah-Kai Hu
Keyword(s):  
Universal Algebras

Theory of models with generalized atomic formulas

1960 ◽  
Vol 25 (1) ◽  
pp. 1-26 ◽  
Author(s):  
H. Jerome Keisler
Keyword(s):  
Natural Number ◽  
Finite Sequence ◽  
Sufficient Condition ◽  
Elementary Extension ◽  
Necessary And Sufficient Condition ◽  
Elementary Class ◽  
Relational Systems ◽  
Necessary And Sufficient

IntroductionWe shall prove the following theorem, which gives a necessary and sufficient condition for an elementary class to be characterized by a set of sentences having a prescribed number of alternations of quantifiers. A finite sequence of relational systems is said to be a sandwich of order n if each is an elementary extension of (i ≦ n—2), and each is an extension of (i ≦ n—2). If K is an elementary class, then the statements (i) and (ii) are equivalent for each fixed natural number n.

WHITEHEAD EXACT SEQUENCE AND DIFFERENTIAL GRADED FREE LIE ALGEBRA

2004 ◽  
Vol 15 (10) ◽  
pp. 987-1005 ◽  
Author(s):  
MAHMOUD BENKHALIFA
Keyword(s):  
Exact Sequence ◽  
Lie Algebra ◽  
Lie Algebras ◽  
Integral Domain ◽  
Free Lie Algebra ◽  
Universal Algebras ◽  
Free Lie Algebras ◽  
Equivalent Class

Let R be a principal and integral domain. We say that two differential graded free Lie algebras over R (free dgl for short) are weakly equivalent if and only if the homologies of their corresponding enveloping universal algebras are isomophic. This paper is devoted to the problem of how we can characterize the weakly equivalent class of a free dgl. Our tool to address this question is the Whitehead exact sequence. We show, under a certain condition, that two R-free dgls are weakly equivalent if and only if their Whitehead sequences are isomorphic.

scholarly journals Measuring Social Capital and Support Networks of Young Immigrants

2016 ◽  
Vol 9 (5) ◽  
pp. 62
Author(s):  
María Paz Sandín Esteban ◽  
Angelina Sánchez Martí ◽  
Ana Belén Cano Hila
Keyword(s):  
Social Capital ◽  
Educational Outcomes ◽  
Compulsory Education ◽  
Academic Persistence ◽  
Methodological Framework ◽  
Personal Network ◽  
The Social ◽  
Relational Systems ◽  
The Impact ◽  
Young Immigrants

<p class="apa">This paper addresses the importance of the diagnosis of “personal communities” as relational systems that may influence the academic pathways of young immigrants. As part of a longitudinal study of the academic persistence of young people in their transition from compulsory to post-compulsory education, a “personal network questionnaire” has been developed. This instrument allows the relational structure of students to be captured and represented, and the impact of this structure on educational outcomes to be analysed. It measures and explores the network of inter-relations with adults (family, educational and recreational professionals, etc.) and peers in different settings. The theoretical elements underpinning its design and implementation are the interweaving of the student social capital and social support system to which they have or may have access to, and the Social Network Analysis (SNA) approach as the methodological framework. This network approach is rendered highly significant and valuable for professionals in educational diagnosis to assess relational vulnerability and design programs of intervention and counseling. With graphic techniques, we can somewhat address this challenge by examining patterns in relational data, experimenting with these data and putting forward hypotheses.</p>

Varieties of infinitary universal algebras

1985 ◽  
Vol 20 (1) ◽  
pp. 123-126
Author(s):  
Ji?� Rosick�
Keyword(s):  
Universal Algebras
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