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  Subjects -> EDUCATION (Total: 1675 journals)
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EDUCATION (1395 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 857 Journals sorted alphabetically
@tic. revista d'innovació educativa     Open Access  
Abant İzzet Baysal Üniversitesi Eğitim Fakültesi Dergisi     Open Access  
About Campus     Hybrid Journal   (Followers: 6)
Academic Medicine     Full-text available via subscription   (Followers: 58)
Academic Psychiatry     Full-text available via subscription   (Followers: 22)
Academic Questions     Hybrid Journal   (Followers: 7)
Academy of Educational Leadership Journal     Full-text available via subscription   (Followers: 52)
Academy of Management Learning and Education     Full-text available via subscription   (Followers: 47)
Accounting & Finance     Hybrid Journal   (Followers: 41)
Accounting Education: An International Journal     Hybrid Journal   (Followers: 13)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 3)
Across the Disciplines     Open Access   (Followers: 7)
Acta Didactica Norge     Open Access  
Acta Scientiarum. Education     Open Access  
Acta Technologica Dubnicae     Open Access  
Action in Teacher Education     Hybrid Journal   (Followers: 54)
Action Learning: Research and Practice     Hybrid Journal   (Followers: 38)
Action Research     Hybrid Journal   (Followers: 38)
Active Learning in Higher Education     Hybrid Journal   (Followers: 229)
Actualidades Pedagógicas     Open Access  
Administration & Society     Hybrid Journal   (Followers: 11)
Administrative Science Quarterly     Full-text available via subscription   (Followers: 135)
Adult Education Quarterly     Hybrid Journal   (Followers: 134)
Advanced Education     Open Access   (Followers: 4)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 23)
Advances in High Energy Physics     Open Access   (Followers: 21)
Advances in School Mental Health Promotion     Partially Free   (Followers: 9)
AERA Open     Open Access   (Followers: 2)
Africa Education Review     Partially Free   (Followers: 24)
African Journal of Chemical Education     Open Access   (Followers: 2)
African Journal of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 5)
African Journal of Health Professions Education     Open Access   (Followers: 4)
African Journal of Research in Mathematics, Science and Technology Education     Full-text available via subscription   (Followers: 8)
Agora     Full-text available via subscription   (Followers: 3)
AGORA Magazine     Open Access  
Ahmad Dahlan Journal of English Studies     Open Access  
AIDS Education and Prevention     Full-text available via subscription   (Followers: 7)
Akadémiai Értesítö     Full-text available via subscription  
AKSIOMA Journal of Mathematics Education     Open Access   (Followers: 1)
Al Ibtida : Jurnal Pendidikan Guru MI     Open Access  
Alexandria : Revista de Educação em Ciência e Tecnologia     Open Access  
Alsic     Open Access   (Followers: 18)
Alteridad     Open Access  
Amasya Universitesi Egitim Fakültesi Dergisi     Open Access  
American Annals of the Deaf     Full-text available via subscription   (Followers: 11)
American Biology Teacher     Full-text available via subscription   (Followers: 12)
American Educational Research Journal     Hybrid Journal   (Followers: 131)
American Journal of Business Education     Open Access   (Followers: 10)
American Journal of Distance Education     Hybrid Journal   (Followers: 28)
American Journal of Education     Full-text available via subscription   (Followers: 153)
American Journal of Educational Research     Open Access   (Followers: 53)
American Journal of Health Education     Hybrid Journal   (Followers: 25)
American Journal of Physics     Full-text available via subscription   (Followers: 55)
ANALES de la Universidad Central del Ecuador     Open Access   (Followers: 1)
Annali dell'Universita di Ferrara     Hybrid Journal  
Annals of Dyslexia     Hybrid Journal   (Followers: 9)
Annals of Modern Education     Full-text available via subscription   (Followers: 3)
Annual Review of Economics     Full-text available via subscription   (Followers: 29)
Apertura. Revista de innovación educativa‏     Open Access   (Followers: 2)
Applied Environmental Education & Communication     Hybrid Journal   (Followers: 13)
Applied Measurement in Education     Hybrid Journal   (Followers: 9)
Art Design & Communication in Higher Education     Hybrid Journal   (Followers: 20)
Arts and Humanities in Higher Education     Hybrid Journal   (Followers: 29)
Arts Education Policy Review     Hybrid Journal   (Followers: 4)
ASHE Higher Education Reports     Hybrid Journal   (Followers: 14)
Asia Pacific Education Review     Hybrid Journal   (Followers: 9)
Asia Pacific Journal of Education     Hybrid Journal   (Followers: 17)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 11)
Asia-Pacific Journal of Health, Sport and Physical Education     Hybrid Journal   (Followers: 9)
Asia-Pacific Journal of Teacher Education     Hybrid Journal   (Followers: 18)
Asian Association of Open Universities Journal     Open Access  
Asian Education and Development Studies     Hybrid Journal   (Followers: 5)
Asian Journal of English Language Teaching     Full-text available via subscription   (Followers: 11)
Asian Journal of Legal Education     Full-text available via subscription   (Followers: 6)
ASp     Open Access   (Followers: 1)
Assessing Writing     Hybrid Journal   (Followers: 10)
Assessment & Evaluation in Higher Education     Hybrid Journal   (Followers: 117)
Assessment for Effective Intervention     Hybrid Journal   (Followers: 14)
Assessment in Education: Principles, Policy & Practice     Hybrid Journal   (Followers: 35)
Assessment Update     Hybrid Journal   (Followers: 5)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5)
At-Ta'dib Jurnal Kependidikan Islam     Open Access  
At-Tajdid : Jurnal Ilmu Tarbiyah     Open Access   (Followers: 2)
At-Turats     Open Access  
Athenea Digital     Open Access  
Aula Abierta     Open Access   (Followers: 1)
Australasian Journal of Educational Technology     Open Access   (Followers: 11)
Australasian Journal of Gifted Education     Full-text available via subscription   (Followers: 4)
Australasian Marketing Journal (AMJ)     Hybrid Journal   (Followers: 8)
Australian Art Education     Full-text available via subscription   (Followers: 6)
Australian Educational and Developmental Psychologist, The     Full-text available via subscription   (Followers: 6)
Australian Educational Computing     Open Access  
Australian Educational Researcher     Hybrid Journal   (Followers: 18)
Australian Journal of Adult Learning     Full-text available via subscription   (Followers: 12)
Australian Journal of Career Development     Hybrid Journal   (Followers: 2)
Australian Journal of Dyslexia and Learning Difficulties     Full-text available via subscription   (Followers: 8)
Australian Journal of Education     Hybrid Journal   (Followers: 28)
Australian Journal of Learning Difficulties     Hybrid Journal   (Followers: 4)
Australian Journal of Music Education     Full-text available via subscription   (Followers: 3)
Australian Journal of Public Administration     Hybrid Journal   (Followers: 375)
Australian Journal of Teacher Education     Open Access   (Followers: 21)
Australian Mathematics Teacher, The     Full-text available via subscription   (Followers: 7)
Australian Primary Mathematics Classroom     Full-text available via subscription   (Followers: 2)
Australian Screen Education Online     Full-text available via subscription   (Followers: 2)
Australian TAFE Teacher     Full-text available via subscription   (Followers: 2)
Australian Universities' Review, The     Full-text available via subscription   (Followers: 3)
Autism     Hybrid Journal   (Followers: 176)
Avaliação : Revista da Avaliação da Educação Superior (Campinas)     Open Access  
Azalea: Journal of Korean Literature & Culture     Full-text available via subscription   (Followers: 4)
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
BELIA : Early Childhood Education Papers     Open Access   (Followers: 4)
BELT - Brazilian English Language Teaching Journal     Open Access   (Followers: 5)
Berkeley Review of Education     Open Access   (Followers: 4)
Biblioteka i Edukacja     Open Access   (Followers: 4)
Bildung und Erziehung     Hybrid Journal   (Followers: 2)
Biosaintifika : Journal of Biology & Biology Education     Open Access   (Followers: 6)
BMC Medical Education     Open Access   (Followers: 40)
BMJ Simulation & Technology Enhanced Learning     Full-text available via subscription   (Followers: 7)
BoEM - Boletim online de Educação Matemática     Open Access  
Boletim Cearense de Educação e História da Matemática     Open Access  
Boletim de Educação Matemática     Open Access  
British Educational Research Journal     Hybrid Journal   (Followers: 155)
British Journal of Educational Studies     Hybrid Journal   (Followers: 129)
British Journal of Educational Technology     Hybrid Journal   (Followers: 120)
British Journal of Religious Education     Hybrid Journal   (Followers: 8)
British Journal of Sociology of Education     Hybrid Journal   (Followers: 45)
British Journal of Special Education     Hybrid Journal   (Followers: 36)
British Journal of Visual Impairment     Hybrid Journal   (Followers: 10)
Brookings Trade Forum     Full-text available via subscription   (Followers: 3)
Business, Management and Education     Open Access   (Followers: 17)
Caderno Brasileiro de Ensino de Física     Open Access  
Caderno Intersabares     Open Access  
Cadernos CEDES     Open Access   (Followers: 1)
Cadernos de Educação, Tecnologia e Sociedade     Open Access  
Cadernos de Pesquisa     Open Access  
Cadernos de Pesquisa     Open Access   (Followers: 2)
Cadernos de Pesquisa em Educação     Open Access  
Cadmo     Full-text available via subscription  
Cahiers de la recherche sur l'éducation et les savoirs     Open Access   (Followers: 4)
Calidad en la educación     Open Access   (Followers: 1)
Cambridge Journal of Education     Hybrid Journal   (Followers: 97)
Campus Legal Advisor     Hybrid Journal   (Followers: 2)
Campus Security Report     Hybrid Journal  
Canadian and International Education     Open Access   (Followers: 8)
Canadian Journal for New Scholars in Education/ Revue canadienne des jeunes chercheures et chercheurs en éducation     Open Access   (Followers: 7)
Canadian Journal for the Scholarship of Teaching and Learning     Open Access   (Followers: 13)
Canadian Journal of Education : Revue canadienne de l'éducation     Open Access   (Followers: 5)
Canadian Journal of Higher Education     Open Access   (Followers: 22)
Canadian Journal of Learning and Technology / La revue canadienne de l’apprentissage et de la technologie     Open Access   (Followers: 12)
Canadian Journal of School Psychology     Hybrid Journal   (Followers: 9)
Canadian Journal of Science, Mathematics and Technology Education     Hybrid Journal   (Followers: 18)
Career Development and Transition for Exceptional Individuals     Hybrid Journal   (Followers: 7)
Catalejos. Revista sobre lectura, formación de lectores y literatura para niños     Open Access  
Catharsis : Journal of Arts Education     Open Access  
CELE Exchange, Centre for Effective Learning Environments     Full-text available via subscription   (Followers: 1)
Cendekia : Jurnal Kependidikan dan Kemasyarakatan     Open Access  
Change: The Magazine of Higher Learning     Hybrid Journal   (Followers: 14)
Changing English: Studies in Culture and Education     Hybrid Journal   (Followers: 6)
Charrette     Open Access  
Chemical Engineering Education     Full-text available via subscription  
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 8)
Chi'e : Journal of Japanese Learning and Teaching     Open Access   (Followers: 1)
Child Language Teaching and Therapy     Hybrid Journal   (Followers: 25)
Child Psychiatry & Human Development     Hybrid Journal   (Followers: 9)
Childhood Education     Hybrid Journal   (Followers: 15)
Children's Literature in Education     Hybrid Journal   (Followers: 8)
Chinese Education & Society     Full-text available via subscription   (Followers: 2)
Christian Higher Education     Hybrid Journal   (Followers: 2)
Christian Perspectives in Education     Open Access   (Followers: 6)
Ciência & Educação (Bauru)     Open Access  
Ciência & Saúde Coletiva     Open Access   (Followers: 2)
Ciencia en Desarrollo     Open Access  
Ciencias Sociales y Educación     Open Access   (Followers: 2)
Citizenship, Social and Economics Education     Full-text available via subscription   (Followers: 5)
Classroom Discourse     Hybrid Journal   (Followers: 8)
Clinical Child and Family Psychology Review     Hybrid Journal   (Followers: 7)
Clio y Asociados     Open Access  
CME     Hybrid Journal   (Followers: 1)
Coaching: An International Journal of Theory, Research and Practice     Hybrid Journal   (Followers: 9)
Cogent Education     Open Access   (Followers: 1)
College Athletics and The Law     Hybrid Journal   (Followers: 1)
College Teaching     Hybrid Journal   (Followers: 12)
Colóquio Internacional de Educação e Seminário de Estratégias e Ações Multidisciplinares     Open Access  
Communication Disorders Quarterly     Hybrid Journal   (Followers: 14)
Communication Education     Hybrid Journal   (Followers: 19)
Communication Methods and Measures     Hybrid Journal   (Followers: 11)
Community College Journal of Research and Practice     Hybrid Journal   (Followers: 8)
Community College Review     Hybrid Journal   (Followers: 7)
Community Development     Hybrid Journal   (Followers: 16)
Community Literacy Journal     Partially Free   (Followers: 2)
Comparative Education     Hybrid Journal   (Followers: 27)
Comparative Education Review     Full-text available via subscription   (Followers: 32)
Comparative Professional Pedagogy     Open Access   (Followers: 2)
Compare: A journal of comparative education     Hybrid Journal   (Followers: 19)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science Education     Hybrid Journal   (Followers: 12)
Computers & Education     Hybrid Journal   (Followers: 123)
Computers in the Schools     Hybrid Journal   (Followers: 7)
Conhecimento & Diversidade     Open Access  

        1 2 3 4 5 6 7 | Last

Journal Cover Annali dell'Universita di Ferrara
  [SJR: 0.504]   [H-I: 14]   [0 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0430-3202 - ISSN (Online) 1827-1510
   Published by Springer-Verlag Homepage  [2340 journals]
  • The Penrose transform in quaternionic geometry
    • Authors: Radu Pantilie
      Abstract: Abstract We study the Penrose transform for the ‘quaternionic objects’ whose twistor spaces are complex manifolds endowed with locally complete families of embedded Riemann spheres with positive normal bundles.
      PubDate: 2017-04-13
      DOI: 10.1007/s11565-017-0281-3
  • Microscopic modeling and analysis of collective decision making: equality
           bias leads suboptimal solutions
    • Authors: Pierluigi Vellucci; Mattia Zanella
      Abstract: Abstract We discuss a novel microscopic model for collective decision-making interacting multi-agent systems. In particular we are interested in modeling a well known phenomena in the experimental literature called equality bias, where agents tend to behave in the same way as if they were as good, or as bad, as their partner. We analyze the introduced problem and we prove the suboptimality of the collective decision-making in the presence of equality bias. Numerical experiments are addressed in the last section.
      PubDate: 2017-04-12
      DOI: 10.1007/s11565-017-0280-4
  • Algebraic methods for vector bundles on non-Kähler elliptic
    • Authors: Vasile Brînzănescu
      Abstract: Abstract We survey some parts of the vast literature on holomorphic vector bundles on compact complex manifolds, focusing on the rank-two case vector bundles on non-Kähler elliptic fibrations. It is by no means intended to be a complete overview of this wide topic, but we rather focus on results obtained by the author and his collaborators.
      PubDate: 2017-03-21
      DOI: 10.1007/s11565-017-0279-x
  • On the syzygies and Hodge theory of nodal hypersurfaces
    • Authors: Alexandru Dimca
      Abstract: Abstract We give lower bounds for the degree of the syzygies involving the partial derivatives of a homogeneous polynomial defining an even dimensional nodal hypersurface. This implies the validity of formulas due to M. Saito, L. Wotzlaw and the author for the graded pieces with respect to the Hodge filtration of the top cohomology of the hypersurface complement in many new cases. A classical result by Severi on the position of the singularities of a nodal surface in \(\mathbb {P}^3\) is improved and applications to deformation theory of nodal surfaces are given.
      PubDate: 2017-03-17
      DOI: 10.1007/s11565-017-0278-y
  • On the semistability of certain Lazarsfeld–Mukai bundles on abelian
    • Authors: Poornapushkala Narayanan
      Abstract: Abstract Let \(X=\mathscr {J}(\widetilde{\mathscr {C}})\) , the Jacobian of a genus 2 curve \(\widetilde{\mathscr {C}}\) over \({\mathbb {C}}\) , and let Y be the associated Kummer surface. Consider an ample line bundle \(L=\mathscr {O}(m\widetilde{\mathscr {C}})\) on X for an even number m, and its descent to Y, say \(L'\) . We show that any dominating component of \({\mathscr {W}}^1_{d}( L' )\) corresponds to \(\mu _{L'}\) -stable Lazarsfeld–Mukai bundles on Y. Further, for a smooth curve \(C\in L \) and a base-point free \(g^1_d\) on C, say (A, V), we study the \(\mu _L\) -semistability of the rank-2 Lazarsfeld–Mukai bundle associated to (C, (A, V)) on X. Under certain assumptions on C and the \(g^1_d\) , we show that the above Lazarsfeld–Mukai bundles are \(\mu _L\) -semistable.
      PubDate: 2017-03-10
      DOI: 10.1007/s11565-017-0277-z
  • Remarks on the normal bundles of generic rational curves
    • Authors: Alberto Alzati; Riccardo Re
      Abstract: Abstract In this note we give a different proof of Sacchiero’s theorem about the splitting type of the normal bundle of a generic rational curve. Moreover we discuss the existence and the construction of smooth monomial curves having generic type of the normal bundle.
      PubDate: 2017-03-04
      DOI: 10.1007/s11565-017-0276-0
  • A regularity criterion for 3D Navier–Stokes equations via one component
           of velocity and vorticity
    • Authors: Myong-Hwan Ri
      Abstract: Abstract In this paper we show that a Leray–Hopf weak solution u to 3D Navier–Stokes initial value problem is smooth if there is some \(\alpha \in {{{\mathbb {R}}}}, \alpha \ne 0,\) such that \(\alpha u_3+(-\Delta )^{-1/2}\omega _3\) is suitably smooth, where \(\omega =\text {curl}\,u\) .
      PubDate: 2017-03-01
      DOI: 10.1007/s11565-017-0274-2
  • Gaussian maps of plane curves with nine singular points
    • Authors: Edoardo Sernesi
      Abstract: Abstract We consider nonsingular curves which are the normalization of plane curves with nine ordinary singular points, viewing them as embedded in the blow-up X of the projective plane along their singular points. For a large class of such curves we show that the gaussian map relative to the canonical line bundle has corank one. The proof makes essential use of the geometry of X.
      PubDate: 2017-02-20
      DOI: 10.1007/s11565-017-0275-1
  • A twisted bicanonical system with base points
    • Authors: Filippo F. Favale; Roberto Pignatelli
      Abstract: Abstract By a theorem of Reider, a twisted bicanonical system, that means a linear system of divisors numerically equivalent to a bicanonical divisor, on a minimal surface of general type, is base point free if \(K^2_S \ge 5\) . Twisted bicanonical systems with base points are known in literature only for \(K^2=1,2\) . We prove in this paper that all surfaces in a family of surfaces with \(K^2=3\) constructed in a previous paper with G. Bini and J. Neves have a twisted bicanonical system (different from the bicanonical system) with two base points. We show that the map induced by the above twisted bicanonical system is birational, and describe in detail the closure of its image and its singular locus. Inspired by this description, we reduce the problem of constructing a minimal surface of general type with \(K^2=3\) whose bicanonical system has base points, under some reasonable assumptions, to the problem of constructing a curve in \({\mathbb {P}}^3\) with certain properties.
      PubDate: 2017-02-10
      DOI: 10.1007/s11565-017-0273-3
  • On the growth and approximation of entire functions represented by
           Laplace–Stieltjes’ transformation
    • Authors: Chhaya Singhal; G. S. Srivastava
      Abstract: Abstract In the present paper, we obtain the characterization of various growth parameters of an entire function F(s) represented by Laplace–Stieltjes transformation in terms of the rate of decrease of \(E_n ( {F,\beta } ),\) where \(E_n ( {F,\beta } )\) represents the error in approximating the function F(s) by exponential polynomials.
      PubDate: 2017-02-09
      DOI: 10.1007/s11565-017-0272-4
  • Some singular value and unitarily invariant norm inequalities for Hilbert
           space operators
    • Authors: A. Taghavi; V. Darvish; H. M. Nazari; S. S. Dragomir
      Abstract: Abstract In this paper, we prove some singular value inequalities for sum and product of operators. Also, we obtain several generalizations of recent inequalities. Moreover, as applications we establish some unitarily invariant norm and trace inequalities for operators which provide refinements of previous results.
      PubDate: 2017-01-31
      DOI: 10.1007/s11565-017-0271-5
  • Remarks on defective Fano manifolds
    • Authors: Paltin Ionescu; Francesco Russo
      Abstract: Abstract This note continues our previous work on special secant defective (specifically, conic connected and local quadratic entry locus) and dual defective manifolds. These are now well understood, except for the prime Fano ones. Here we add a few remarks on this case, completing the results in our papers (Russo in Math Ann 344:597–617, 2009; Ionescu and Russo in Compos Math 144:949–962, 2008; Ionescu and Russo in J Reine Angew Math 644:145–157, 2010; Ionescu and Russo in Am J Math 135:349–360, 2013; Ionescu and Russo in Math Res Lett 21:1137–1154, 2014); see also the recent book (Russo, On the Geometry of Some Special Projective Varieties, Lecture Notes of the Unione Matematica Italiana, Springer, 2016).
      PubDate: 2017-01-27
      DOI: 10.1007/s11565-017-0270-6
  • Ulrich line bundles on Enriques surfaces with a polarization of degree
    • Authors: Marian Aprodu; Yeongrak Kim
      Abstract: Abstract In this paper, we prove the existence of an Enriques surface with a polarization of degree four with an Ulrich bundle of rank one. As a consequence, we prove that general polarized Enriques surfaces of degree four, with the same numerical polarization class, carry Ulrich line bundles.
      PubDate: 2017-01-21
      DOI: 10.1007/s11565-017-0269-z
  • Height estimates and half-space type theorems in weighted product spaces
           with nonnegative Bakry–Émery–Ricci curvature
    • Authors: Henrique F. de Lima; Márcio S. Santos
      Abstract: Abstract We prove height estimates concerning compact hypersurfaces with nonzero constant weighted mean curvature and whose boundary is contained into a slice of a weighted product space of nonnegative Bakry–Émery–Ricci curvature. As applications of our estimates, we obtain half-space type results related to complete noncompact hypersurfaces properly immersed in such an ambient space.
      PubDate: 2016-11-16
      DOI: 10.1007/s11565-016-0268-5
  • On a rigidity result of singularities
    • Authors: Lucian Bădescu
      Abstract: Abstract The aim of this note is to prove, in the spirit of a rigidity result for isolated singularities of Schlessinger see Schlessinger (Invent Math 14:17–26, 1971) or also Kleiman and Landolfi (Compositio Math 23:407–434, 1971), a variant of a rigidity criterion for arbitrary singularities (Theorem 2.1 below). The proof of this result does not use Schlessinger’s Deformation Theory [Schlessinger (Trans Am Math Soc 130:208–222, 1968) and Schlessinger (Invent Math 14:17–26, 1971)]. Instead it makes use of Local Grothendieck-Lefschetz Theory, see (Grothendieck 1968, Éxposé 9, Proposition 1.4, page 106) and a Lemma of Zariski, see (Zariski, Am J Math 87:507–536, 1965, Lemma 4, page 526). I hope that this proof, although works only in characteristic zero, might also have some interest in its own.
      PubDate: 2016-11-15
      DOI: 10.1007/s11565-016-0267-6
  • Approximation by Stancu type q -operators
    • Authors: Zoltán Finta
      Abstract: Abstract We introduce a sequence of Stancu type integral operators involving q-Beta functions, and we establish some direct results, which include a Korovkin type theorem and error estimations in terms of the modulus of continuity and the Lipschitz type maximal function, respectively. We also define the limit operator of our sequence of operators, and we obtain quantitative approximation theorems for it.
      PubDate: 2016-09-12
      DOI: 10.1007/s11565-016-0257-8
  • Commutator identity involving generalized derivations on multilinear
    • Authors: Basudeb Dhara; Mohd Arif Raza; Nadeem Ur Rehman
      Abstract: Abstract Let R be a prime ring of characteristic different from 2 with Utumi quotient ring U, C be the extended centroid of \(R,\, F\) and G be two nonzero generalized derivations of R and \(f(x_1,\ldots ,x_n)\) be a multilinear polynomial over C which is not central valued on R. If $$\begin{aligned} {[}F(u)u, G(v)v]=0 \end{aligned}$$ for all \(u,v\in f(R)\) , then there exist \(a,b\in U\) such that \(F(x)=ax\) and \(G(x)=bx\) for all \(x\in R\) with \([a, b]=0\) and \(f(x_1,\ldots ,x_n)^2\) is central valued on R.
      PubDate: 2016-08-18
      DOI: 10.1007/s11565-016-0255-x
  • Singularities on demi-normal varieties
    • Authors: Jeremy Berquist
      Abstract: Abstract The birational classification of varieties inevitably leads to the study of singularities. The types of singularities that occur in this context have been studied by Mori, Kollár, Reid, and others, beginning in the 1980s with the introduction of the Minimal Model Program. Normal singularities that are terminal, canonical, log terminal, and log canonical, and their non-normal counterparts, are typically studied by using a resolution of singularities (or a semi-resolution), and finding numerical conditions that relate the canonical class of the variety to that of its resolution. In order to do this, it has been assumed that a variety X is has a \({\mathbb {Q}}\) -Cartier canonical class: some multiple \(mK_X\) of the canonical class is Cartier. In particular, this divisor can be pulled back under a resolution \(f: Y \rightarrow X\) by pulling back its local sections. Then one has a relation \(K_Y \sim \frac{1}{m}f^*(mK_X) + \sum a_iE_i\) . It is then the coefficients of the exceptional divisors \(E_i\) that determine the type of singularities that belong to X. It might be asked whether this \({\mathbb {Q}}\) -Cartier hypothesis is necessary in studying singularities in birational classification. de Fernex and Hacon (Compos Math 145:393–414, 2009) construct a boundary divisor \(\Delta \) for arbitrary normal varieties, the resulting divisor \(K_X + \Delta \) being \({\mathbb {Q}}\) -Cartier even though \(K_X\) itself is not. This they call (for reasons that will be made clear) an m-compatible boundary for X, and they proceed to show that the singularities defined in terms of the pair \((X,\Delta )\) are none other than the singularities just described, when \(K_X\) happens to be \({\mathbb {Q}}\) -Cartier. Thus, a wider context exists within which one can study singularities of the above types. In the present paper, we extend the results of de Fernex and Hacon (Compos Math 145:393–414, 2009) still further, to include demi-normal varieties without a \({\mathbb {Q}}\) -Cartier canonical class. Our main result is that m-compatible boundaries exist for demi-normal varieties (Theorem 1.1). This theorem provides a link between the theory of singularities for arbitrary demi-normal varieites (whose canonical class may not \(\hbox {be } {\mathbb {Q}}\) -Cartier), that theory being developed in the present paper, and the established theory of singularities of pairs.
      PubDate: 2016-08-02
      DOI: 10.1007/s11565-016-0251-1
  • Existence and non-existence of positive solutions of Sturm–Liouville
           BVPs for ODEs on whole line
    • Authors: Yuji Liu
      Abstract: Abstract This paper is concerned with a boundary value problem of second order singular differential equations on whole line. Sufficient conditions to guarantee existence and non-existence of positive solutions are established. Our results improve some theorems in known papers but the methods used are different. We give two examples to illustrate main theorems.
      PubDate: 2016-06-08
      DOI: 10.1007/s11565-016-0246-y
  • Some results on generalized multiplicative perfect numbers
    • Authors: Alexandre Laugier; Manjil P. Saikia; Upam Sarmah
      Abstract: Abstract In this article, based on ideas and results by Sándor (J Inequal Pure Appl Math 2:Art. 3, 2001; J Inequal Pure Appl Math 5, 2004), we define k-multiplicatively e-perfect numbers and k-multiplicatively e-superperfect numbers and prove some results on them. We also characterize the k- \(T_0T^*\) -perfect numbers defined by Das and Saikia (Notes Number Theory Discrete Math 19:37–42, 2013) in details.
      PubDate: 2016-06-06
      DOI: 10.1007/s11565-016-0248-9
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