Pub Date : 2023-04-01DOI: 10.2478/subboec-2023-0001
Andreea Stancea, C. Ciocîrlan
Abstract Macroeconomic expectations play a major role in predicting individual choices and behavior. This paper examines the effects of public debt expectations and knowledge on demand for government spending measured by individual preferences. Using a unique survey dataset applied in Central and Eastern Europe, the results show that the most knowledgeable citizens tend to support the increase in public spending. Debt expectations also have a significant impact on public spending preferences: citizens who have negative debt expectations are less likely to support public spending increases. The results shed light on the importance of economic knowledge and information provision for shaping public attitudes about future taxation.
{"title":"Demand for Government Spending: Do Our Beliefs About Public Debt Matter?","authors":"Andreea Stancea, C. Ciocîrlan","doi":"10.2478/subboec-2023-0001","DOIUrl":"https://doi.org/10.2478/subboec-2023-0001","url":null,"abstract":"Abstract Macroeconomic expectations play a major role in predicting individual choices and behavior. This paper examines the effects of public debt expectations and knowledge on demand for government spending measured by individual preferences. Using a unique survey dataset applied in Central and Eastern Europe, the results show that the most knowledgeable citizens tend to support the increase in public spending. Debt expectations also have a significant impact on public spending preferences: citizens who have negative debt expectations are less likely to support public spending increases. The results shed light on the importance of economic knowledge and information provision for shaping public attitudes about future taxation.","PeriodicalId":30022,"journal":{"name":"Studia Universitatis BabesBolyai Geologia","volume":"130 2 1","pages":"1 - 20"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80181916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-01DOI: 10.2478/subboec-2023-0002
Arina Ivasiuc
Abstract This paper investigates herding behavior of investors in three frontier Nordic countries from July 1, 2002 until July 30, 2021, under different market conditions and during three crises that occurred in this period. As estimation methods, we use both OLS and quantile regression and determine that both up and down market, high and low volatility induce a weak herding behavior for at least one quantile in almost all Nordic countries examined, except for Latvia. At the same time, we find that crises determine a more prominent herding behavior in Nordic countries, but do not influent the behavior of investors from Latvia, that tend to remain rational even in stressful conditions.
{"title":"Herding Behavior in Frontier Nordic Countries","authors":"Arina Ivasiuc","doi":"10.2478/subboec-2023-0002","DOIUrl":"https://doi.org/10.2478/subboec-2023-0002","url":null,"abstract":"Abstract This paper investigates herding behavior of investors in three frontier Nordic countries from July 1, 2002 until July 30, 2021, under different market conditions and during three crises that occurred in this period. As estimation methods, we use both OLS and quantile regression and determine that both up and down market, high and low volatility induce a weak herding behavior for at least one quantile in almost all Nordic countries examined, except for Latvia. At the same time, we find that crises determine a more prominent herding behavior in Nordic countries, but do not influent the behavior of investors from Latvia, that tend to remain rational even in stressful conditions.","PeriodicalId":30022,"journal":{"name":"Studia Universitatis BabesBolyai Geologia","volume":"15 1","pages":"21 - 41"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85281542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-17DOI: 10.24193/subbmath.2023.1.06
D. Motreanu
"The main result of the paper provides the existence of a solution to a quasilinear inclusion problem with Dirichlet boundary condition which exhibits a term with full dependence on the solution and its gradient (convection term) and is driven by the degenerated p-Laplacian with weight. The multivalued term in the differential inclusion is in form of the generalized gradient of a locally Lipschitz function expressed through the primitive of a locally essentially bounded function, which makes the problem to be of a hemivariational inequality type. The novelty of our result is that we are able to simultaneously handle three major features: degenerated leading operator, convection term and discontinuous nonlinearity. Results of independent interest regard certain nonlinear operators associated to the differential inclusion."
{"title":"Quasilinear differential inclusions driven by degenerated p-Laplacian with weight","authors":"D. Motreanu","doi":"10.24193/subbmath.2023.1.06","DOIUrl":"https://doi.org/10.24193/subbmath.2023.1.06","url":null,"abstract":"\"The main result of the paper provides the existence of a solution to a quasilinear inclusion problem with Dirichlet boundary condition which exhibits a term with full dependence on the solution and its gradient (convection term) and is driven by the degenerated p-Laplacian with weight. The multivalued term in the differential inclusion is in form of the generalized gradient of a locally Lipschitz function expressed through the primitive of a locally essentially bounded function, which makes the problem to be of a hemivariational inequality type. The novelty of our result is that we are able to simultaneously handle three major features: degenerated leading operator, convection term and discontinuous nonlinearity. Results of independent interest regard certain nonlinear operators associated to the differential inclusion.\"","PeriodicalId":30022,"journal":{"name":"Studia Universitatis BabesBolyai Geologia","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78152392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-17DOI: 10.24193/subbmath.2023.1.05
L. Barbu, G. Moroşanu
"This is a survey on recent results, mostly of the authors, regarding eigenvalue problems governed by the (p,q)-Laplacian and related open problems."
“这是对最近的结果的调查，主要是作者，关于(p,q)-拉普拉斯控制的特征值问题和相关的开放问题。”
{"title":"On eigenvalue problems governed by the (p,q)-Laplacian","authors":"L. Barbu, G. Moroşanu","doi":"10.24193/subbmath.2023.1.05","DOIUrl":"https://doi.org/10.24193/subbmath.2023.1.05","url":null,"abstract":"\"This is a survey on recent results, mostly of the authors, regarding eigenvalue problems governed by the (p,q)-Laplacian and related open problems.\"","PeriodicalId":30022,"journal":{"name":"Studia Universitatis BabesBolyai Geologia","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73218083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-17DOI: 10.24193/subbmath.2023.1.02
Lucas Fresse, V. V. Motreanu
"Given a bounded domain with Lipschitz boundary, the general Green formula permits to justify that the weak solutions of a Neumann elliptic problem satisfy the Neumann boundary condition in a weak sense. The formula involves a generalized normal derivative. We prove a general result which establishes that the generalized normal derivative of an operator coincides with the classical one, provided that the operator is continuous. This result allows to deduce that, under usual regularity assumptions, the weak solutions of a Neumann problem satisfy the Neumann boundary condition in the classical sense. This information is nec- essary in particular for applying the strong maximum principle."
{"title":"Generalized versus classical normal derivative","authors":"Lucas Fresse, V. V. Motreanu","doi":"10.24193/subbmath.2023.1.02","DOIUrl":"https://doi.org/10.24193/subbmath.2023.1.02","url":null,"abstract":"\"Given a bounded domain with Lipschitz boundary, the general Green formula permits to justify that the weak solutions of a Neumann elliptic problem satisfy the Neumann boundary condition in a weak sense. The formula involves a generalized normal derivative. We prove a general result which establishes that the generalized normal derivative of an operator coincides with the classical one, provided that the operator is continuous. This result allows to deduce that, under usual regularity assumptions, the weak solutions of a Neumann problem satisfy the Neumann boundary condition in the classical sense. This information is nec- essary in particular for applying the strong maximum principle.\"","PeriodicalId":30022,"journal":{"name":"Studia Universitatis BabesBolyai Geologia","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75928078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-17DOI: 10.24193/subbmath.2023.1.16
Mosbah Kaddour, F. Messelmi
"This work studies the initial boundary value problem for the Petrovsky equation with nonlinear damping begin{equation*} frac{partial ^{2}u}{partial t^{2}}+Delta ^{2}u-Delta u^{prime} +leftvert urightvert ^{p-2}u+alpha gleft( u^{prime }right) =beta fleft( uright) text{ in }Omega times left[ 0,+infty right[, end{equation*} where $Omega $ is open and bounded domain in $mathbb{R}^{n}$ with a smooth boundary $partial Omega =Gamma$, $alpha$, and $beta >0$. For the nonlinear continuous term $fleft( uright) $ and for $g$ continuous, increasing, satisfying $g$ $left( 0right) $ $=0$, under suitable conditions, the global existence of the solution is proved by using the Faedo-Galerkin argument combined with the stable set method in $H_{0}^{2}left( Omega right)$. Furthermore, we show that this solution blows up in a finite time when the initial energy is negative."
{"title":"Global existence and blow-up of a Petrovsky equation with general nonlinear dissipative and source terms","authors":"Mosbah Kaddour, F. Messelmi","doi":"10.24193/subbmath.2023.1.16","DOIUrl":"https://doi.org/10.24193/subbmath.2023.1.16","url":null,"abstract":"\"This work studies the initial boundary value problem for the Petrovsky equation with nonlinear damping begin{equation*} frac{partial ^{2}u}{partial t^{2}}+Delta ^{2}u-Delta u^{prime} +leftvert urightvert ^{p-2}u+alpha gleft( u^{prime }right) =beta fleft( uright) text{ in }Omega times left[ 0,+infty right[, end{equation*} where $Omega $ is open and bounded domain in $mathbb{R}^{n}$ with a smooth boundary $partial Omega =Gamma$, $alpha$, and $beta >0$. For the nonlinear continuous term $fleft( uright) $ and for $g$ continuous, increasing, satisfying $g$ $left( 0right) $ $=0$, under suitable conditions, the global existence of the solution is proved by using the Faedo-Galerkin argument combined with the stable set method in $H_{0}^{2}left( Omega right)$. Furthermore, we show that this solution blows up in a finite time when the initial energy is negative.\"","PeriodicalId":30022,"journal":{"name":"Studia Universitatis BabesBolyai Geologia","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80266044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-17DOI: 10.24193/subbmath.2023.1.13
A. Choucha, D. Ouchenane
"In this work, we are concerned with a problem of a logarithmic nonlinear wave equation with time-varying delay term. We established the local existence result and we proved a blow up result for the solution with negative initial energy under suitable conditions. This improves earlier results in the literature [11] for time-varying delay."
{"title":"Local existence and blow up of solutions to a logarithmic nonlinear wave equation with time-varying delay","authors":"A. Choucha, D. Ouchenane","doi":"10.24193/subbmath.2023.1.13","DOIUrl":"https://doi.org/10.24193/subbmath.2023.1.13","url":null,"abstract":"\"In this work, we are concerned with a problem of a logarithmic nonlinear wave equation with time-varying delay term. We established the local existence result and we proved a blow up result for the solution with negative initial energy under suitable conditions. This improves earlier results in the literature [11] for time-varying delay.\"","PeriodicalId":30022,"journal":{"name":"Studia Universitatis BabesBolyai Geologia","volume":"197 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86830610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-17DOI: 10.24193/subbmath.2023.1.12
A. Sebastian, V. Ravichandran
"A normalized function $f$ on the open unit disc is starlike (or convex) univalent if the associated function $zf'(z)/f(z)$ (or $1+zf''(z)/f'(z)$) is a function with positive real part. The radius of starlikeness or convexity is usually obtained by using the estimates for functions with positive real part. Using subordination, we examine the radius of various starlikeness, in particular, radii of Janowski starlikeness and starlikeness of order $beta$, for the function $f$ when the function $f$ is either convex or $(zf'(z)+alpha z^2f''(z))/f(z)$ lies in the right-half plane. Radii of starlikeness associated with lemniscate of Bernoulli and exponential functions are also considered."
{"title":"Radius of starlikeness through subordination","authors":"A. Sebastian, V. Ravichandran","doi":"10.24193/subbmath.2023.1.12","DOIUrl":"https://doi.org/10.24193/subbmath.2023.1.12","url":null,"abstract":"\"A normalized function $f$ on the open unit disc is starlike (or convex) univalent if the associated function $zf'(z)/f(z)$ (or $1+zf''(z)/f'(z)$) is a function with positive real part. The radius of starlikeness or convexity is usually obtained by using the estimates for functions with positive real part. Using subordination, we examine the radius of various starlikeness, in particular, radii of Janowski starlikeness and starlikeness of order $beta$, for the function $f$ when the function $f$ is either convex or $(zf'(z)+alpha z^2f''(z))/f(z)$ lies in the right-half plane. Radii of starlikeness associated with lemniscate of Bernoulli and exponential functions are also considered.\"","PeriodicalId":30022,"journal":{"name":"Studia Universitatis BabesBolyai Geologia","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79092812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-17DOI: 10.24193/subbmath.2023.1.14
Somia Djiab, B. Nouiri
"This paper deals with a boundary value problem for a nonlinear differential equation with two conformable fractional derivatives and integral boundary conditions. The results of existence, uniqueness and stability of positive solutions are proved by using the Banach contraction principle, Guo-Krasnoselskii's fixed point theorem and Hyers-Ulam type stability. Two concrete examples are given to illustrate the main results."
{"title":"Nonlinear two conformable fractional differential equation with integral boundary condition","authors":"Somia Djiab, B. Nouiri","doi":"10.24193/subbmath.2023.1.14","DOIUrl":"https://doi.org/10.24193/subbmath.2023.1.14","url":null,"abstract":"\"This paper deals with a boundary value problem for a nonlinear differential equation with two conformable fractional derivatives and integral boundary conditions. The results of existence, uniqueness and stability of positive solutions are proved by using the Banach contraction principle, Guo-Krasnoselskii's fixed point theorem and Hyers-Ulam type stability. Two concrete examples are given to illustrate the main results.\"","PeriodicalId":30022,"journal":{"name":"Studia Universitatis BabesBolyai Geologia","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74524137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-17DOI: 10.24193/subbmath.2023.1.11
S. El-Deeb, Alina Alb-Lupas
"The object of the present paper is to obtain several fuzzy differential subordinations associated with Linear operator $$mathcal{D}_{n,delta ,g}^{m}f(z) =z+sumlimits_{j=2}^{infty }left[ 1+left( j-1right) c^{n}(delta )right] ^{m}a_{j}b_{j}z^{j}.$$ Using the operator $mathcal{D}_{n,delta ,g}^{m},$ we also introduce a class $mathcal{H}_{n,m,delta }^{F}left( eta ,gright) $ of univalent analytic functions for which we give some properties."
{"title":"Fuzzy differential subordinations connected with convolution","authors":"S. El-Deeb, Alina Alb-Lupas","doi":"10.24193/subbmath.2023.1.11","DOIUrl":"https://doi.org/10.24193/subbmath.2023.1.11","url":null,"abstract":"\"The object of the present paper is to obtain several fuzzy differential subordinations associated with Linear operator $$mathcal{D}_{n,delta ,g}^{m}f(z) =z+sumlimits_{j=2}^{infty }left[ 1+left( j-1right) c^{n}(delta )right] ^{m}a_{j}b_{j}z^{j}.$$ Using the operator $mathcal{D}_{n,delta ,g}^{m},$ we also introduce a class $mathcal{H}_{n,m,delta }^{F}left( eta ,gright) $ of univalent analytic functions for which we give some properties.\"","PeriodicalId":30022,"journal":{"name":"Studia Universitatis BabesBolyai Geologia","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88242001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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