Search results for "VARIETY"
showing 10 items of 569 documents
Are locally finite MV-algebras a variety?
2021
We answer Mundici's problem number 3 (D. Mundici. Advanced {\L}ukasiewicz calculus. Trends in Logic Vol. 35. Springer 2011, p. 235): Is the category of locally finite MV-algebras equivalent to an equational class? We prove: (i) The category of locally finite MV-algebras is not equivalent to any finitary variety. (ii) More is true: the category of locally finite MV-algebras is not equivalent to any finitely-sorted finitary quasi-variety. (iii) The category of locally finite MV-algebras is equivalent to an infinitary variety; with operations of at most countable arity. (iv) The category of locally finite MV-algebras is equivalent to a countably-sorted finitary variety. Our proofs rest upon th…
Correspondence between some metabelian varieties and left nilpotent varieties
2021
Abstract In the class of left nilpotent algebras of index two it was proved that there are no varieties of fractional polynomial growth ≈ n α with 1 α 2 and 2 α 3 instead it was established the existence of a variety of fractional polynomial growth with α = 7 2 . In this paper we investigate similar problems for varieties of commutative or anticommutative metabelian algebras. We construct a correspondence between left nilpotent algebras of index two and commutative metabelian algebras or anticommutative metabelian algebras and we prove that the codimensions sequences of the corresponding algebras coincide up to a constant. This allows us to transfer the above results concerning varieties of…
Project Management Information Systems (PMISs): A Statistical-Based Analysis for the Evaluation of Software Packages Features
2021
Project Managers (PMs) working in competitive markets are finding Project Management Information Systems (PMISs) useful for planning, organizing and controlling projects of varying complexity. A wide variety of PMIS software is available, suitable for projects differing in scope and user needs. This paper identifies the most useful features found in PMISs. An extensive literature review and analysis of commercial software is made to identify the main features of PMISs. Afterwards, the list is reduced by a panel of project management experts, and a statistical analysis is performed on data acquired by means of two different surveys. The relative importance of listed features is properly comp…
The Case of Gabriel: A Linguistic Therapy of Evaluation Perspective
2010
This article describes the treatment of Gabriel, 24, an undergraduate student suffering from performance anxiety. His main symptoms were heart palpitations, aching muscles, inability to relax, nervousness, worry, and negative anticipation about performance in various classes. The treatment applied was 13 sessions of linguistic therapy of evaluation (LTE), a variety of cognitive therapy based on the theory of general semantics. The main therapeutic techniques involved emphasizing the difference between words and “facts” (the “map” and the “territory”), general semantics debate, and the focusing on orders of abstraction. Across treatment Gabriel showed a clear shift from an intensional orient…
<Pheromones> and behaviour of rodents and primates
1987
Abstract This paper reviews the concept of the ≪pheromone≫ as applied to behavioural studies on mammals with particular emphasis on rodents and primates. It is concluded that although the olfactory sense is very important in many representatives of these orders, the term pheromone is often used too uncritically in such species. Odours may certainly change behaviour but: (a) it is difficult to identify complex specific chemicals underlying such effects; (b) the response often depends on the nature and experiences of the recipient animal; and (c) many behaviours in such animals are modulated by a variety of sensory inputs. Perhaps ≪sociochemical communication≫ would be a better term to apply …
MADE – A Groupware Application to Support Real-Time Activities of Distributed and Cooperating Communities
2003
Abstract. Distributed work has increased during the last few years. Employees travelling around in different countries still need access to information and must be reachable by their colleagues. A variety of mobile devices have been utilised for this purpose. However, often, when using multiple devices, the information is available to the appropriate device only. Transferring data between the devices is not always an intuitive or easy thing to do – not while conversing at least. This paper presents a groupware application to support real-time actions of distributed communities. The problem of separate devices is addressed by combining multiple tools, media, into a platform independent aggre…
Hypergraph functor and attachment
2010
Using an arbitrary variety of algebras, the paper introduces a fuzzified version of the notion of attachment in a complete lattice of Guido, to provide a common framework for the concept of hypergraph functor considered by different authors in the literature. The new notion also gives rise to a category of variable-basis topological spaces which is a proper supercategory of the respective category of Rodabaugh.
Varieties with at most quadratic growth
2010
Let V be a variety of non necessarily associative algebras over a field of characteristic zero. The growth of V is determined by the asymptotic behavior of the sequence of codimensions cn(V); n = 1; 2, … and here we study varieties of polynomial growth. Recently, for any real number a, 3 < a < 4, a variety V was constructed satisfying C1n^a < cn(V) < C2n^a; for some constants C1;C2. Motivated by this result here we try to classify all possible growth of varieties V such that cn(V) < Cn^a; with 0 < a < 2, for some constant C. We prove that if 0 < a < 1 then, for n large, cn(V) ≤ 1, whereas if V is a commutative variety and 1 < a < 2, then lim logn cn(V) = 1 o…
On the exponential growth of graded Capelli polynomials
2013
In a free superalgebra over a field of characteristic zero we consider the graded Capelli polynomials Cap M+1[Y,X] and Cap L+1[Z,X] alternating on M+1 even variables and L+1 odd variables, respectively. Here we compute the superexponent of the variety of superalgebras determinated by Cap M+1[Y,X] and Cap L+1[Z,X]. An essential tool in our computation is the generalized-six-square theorem proved in [3].
CREATIVE TOOLS FOR THE FORMATION OF PUBLIC SIGNS IN THE URBAN ENVIRONMENT OF THE BALTIC STATES
2014
<p>In public space there is the information, that is always designed with a specific purpose. For example, signposts are placed to provide direction guidance and to highlight some of the most important objects. Public signs function as the visiting cards of some institution or enterprise, creating indirectly a definite image of these institutions or some ethnic or social groups, while graffiti is written to create and maintain a public image and to express emotions or attitudes towards some person, a group of people, events or processes. To achieve the expected objective the authors of signs often use the eye-catching texts that differ from linguistic and para-linguistic means, such a…