Pub Date : 2026-01-01Epub Date: 2025-11-19DOI: 10.1016/j.geomphys.2025.105711
Prosenjit Mandal , Absos Ali Shaikh , Prince Majeed
This paper intends to the study of compact as well as non-compact m-Bach soliton. We have shown that a compact m-Bach soliton with either and or and is Bach flat. Later, in dimension 4 with non-zero Ricci curvature, we have manifested that a gradient m-Bach soliton is Bach flat. Again, we have determined the nature of the potential vector field on an m-Bach soliton as a conformal motion and acquired that such a motion becomes homothetic and the potential vector field is trivial. Also, in a 4-dimensional compact gradient m-Bach soliton with a condition we have established that the soliton vector field is Killing, and also deduced with an another condition that the soliton becomes steady. Furthermore, we have achieved that in a compact m-Bach soliton, the potential function differs from the Hodge-de Rham potential only by a constant. Finally, depending on the sign of m, it is demonstrated that an m-Bach soliton which is non-compact with a restriction on the potential vector field is either non-shrinking or non-expanding.
{"title":"Some results on m-Bach soliton","authors":"Prosenjit Mandal , Absos Ali Shaikh , Prince Majeed","doi":"10.1016/j.geomphys.2025.105711","DOIUrl":"10.1016/j.geomphys.2025.105711","url":null,"abstract":"<div><div>This paper intends to the study of compact as well as non-compact <em>m</em>-Bach soliton. We have shown that a compact <em>m</em>-Bach soliton with either <span><math><mi>m</mi><mo>></mo><mn>0</mn></math></span> and <span><math><mi>σ</mi><mo>≥</mo><mn>0</mn></math></span> or <span><math><mi>m</mi><mo><</mo><mn>0</mn></math></span> and <span><math><mi>σ</mi><mo>≤</mo><mn>0</mn></math></span> is Bach flat. Later, in dimension 4 with non-zero Ricci curvature, we have manifested that a gradient <em>m</em>-Bach soliton is Bach flat. Again, we have determined the nature of the potential vector field on an <em>m</em>-Bach soliton as a conformal motion and acquired that such a motion becomes homothetic and the potential vector field is trivial. Also, in a 4-dimensional compact gradient <em>m</em>-Bach soliton with a condition we have established that the soliton vector field is Killing, and also deduced with an another condition that the soliton becomes steady. Furthermore, we have achieved that in a compact <em>m</em>-Bach soliton, the potential function differs from the Hodge-de Rham potential only by a constant. Finally, depending on the sign of <em>m</em>, it is demonstrated that an <em>m</em>-Bach soliton which is non-compact with a restriction on the potential vector field is either non-shrinking or non-expanding.</div></div>","PeriodicalId":55602,"journal":{"name":"Journal of Geometry and Physics","volume":"219 ","pages":"Article 105711"},"PeriodicalIF":1.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-03DOI: 10.1016/j.geomphys.2025.105690
Alexander Flamant , Bram Mesland , Adam Rennie
We compare the constructions of Levi-Civita connections for noncommutative algebras developed in [2], [8], [15]. The assumptions in these various constructions differ, but when they are all defined, we provide direct translations between them. An essential assumption is that the (indefinite) Hermitian inner product on differential forms/vector fields provides an isomorphism with the module dual. By exploiting our translations and clarifying the simplifications that occur for centred bimodules, we extend the existence results for Hermitian torsion-free connections in [2], [8].
{"title":"Comparison of Levi-Civita connections in noncommutative geometry","authors":"Alexander Flamant , Bram Mesland , Adam Rennie","doi":"10.1016/j.geomphys.2025.105690","DOIUrl":"10.1016/j.geomphys.2025.105690","url":null,"abstract":"<div><div>We compare the constructions of Levi-Civita connections for noncommutative algebras developed in <span><span>[2]</span></span>, <span><span>[8]</span></span>, <span><span>[15]</span></span>. The assumptions in these various constructions differ, but when they are all defined, we provide direct translations between them. An essential assumption is that the (indefinite) Hermitian inner product on differential forms/vector fields provides an isomorphism with the module dual. By exploiting our translations and clarifying the simplifications that occur for centred bimodules, we extend the existence results for Hermitian torsion-free connections in <span><span>[2]</span></span>, <span><span>[8]</span></span>.</div></div>","PeriodicalId":55602,"journal":{"name":"Journal of Geometry and Physics","volume":"219 ","pages":"Article 105690"},"PeriodicalIF":1.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145475850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-20DOI: 10.1016/j.geomphys.2025.105716
Fernando A.Z. Santamaria, Elizaveta Vishnyakova
We develop the theory of H-graded manifolds for any finitely generated abelian group, using tools from representation theory. Furthermore, we introduce and investigate the notion of H-graded coverings of supermanifolds in the case where H is a finite abelian group.
{"title":"H-covering of a supermanifold","authors":"Fernando A.Z. Santamaria, Elizaveta Vishnyakova","doi":"10.1016/j.geomphys.2025.105716","DOIUrl":"10.1016/j.geomphys.2025.105716","url":null,"abstract":"<div><div>We develop the theory of <em>H</em>-graded manifolds for any finitely generated abelian group, using tools from representation theory. Furthermore, we introduce and investigate the notion of <em>H</em>-graded coverings of supermanifolds in the case where <em>H</em> is a finite abelian group.</div></div>","PeriodicalId":55602,"journal":{"name":"Journal of Geometry and Physics","volume":"219 ","pages":"Article 105716"},"PeriodicalIF":1.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145623713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-07DOI: 10.1016/j.geomphys.2025.105701
Loïc Marsot, Yuzhang Liu
This article aims to derive equations of motion for dynamical systems with angular momentum on Finsler geometries. To this end, we apply Souriau's Principle of General Covariance, which is a geometrical framework to derive diffeomorphism invariant equations of motion. The equations we obtain are the generalization of that of Mathisson-Papapetrou-Dixon (MPD) on Finsler geometries, and we give their conserved quantities which turn out to be formally identical to the Riemannian case.
These equations share the same properties as the MPD equations, and we mention different choices possible for supplementary conditions to close this system of equations. These equations have an additional requirement, which is the choice of what defines the tangent direction of the Finsler manifold, since the velocity and momentum are not parallel in general. After choosing the momentum as the Finsler direction and to define the center of mass, we give the complete equations of motion in 3 spatial dimensions, which we find coincide to previously known equations for Finsler spinoptics, and novel equations in 4 dimensions for massive and massless dynamical systems.
{"title":"Equations of motion for dynamical systems with angular momentum on Finsler geometries","authors":"Loïc Marsot, Yuzhang Liu","doi":"10.1016/j.geomphys.2025.105701","DOIUrl":"10.1016/j.geomphys.2025.105701","url":null,"abstract":"<div><div>This article aims to derive equations of motion for dynamical systems with angular momentum on Finsler geometries. To this end, we apply Souriau's Principle of General Covariance, which is a geometrical framework to derive diffeomorphism invariant equations of motion. The equations we obtain are the generalization of that of Mathisson-Papapetrou-Dixon (MPD) on Finsler geometries, and we give their conserved quantities which turn out to be formally identical to the Riemannian case.</div><div>These equations share the same properties as the MPD equations, and we mention different choices possible for supplementary conditions to close this system of equations. These equations have an additional requirement, which is the choice of what defines the tangent direction of the Finsler manifold, since the velocity and momentum are not parallel in general. After choosing the momentum as the Finsler direction and to define the center of mass, we give the complete equations of motion in 3 spatial dimensions, which we find coincide to previously known equations for Finsler spinoptics, and novel equations in 4 dimensions for massive and massless dynamical systems.</div></div>","PeriodicalId":55602,"journal":{"name":"Journal of Geometry and Physics","volume":"219 ","pages":"Article 105701"},"PeriodicalIF":1.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145529319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-05DOI: 10.1016/j.geomphys.2025.105693
Marco Castrillón López , Álvaro Rodríguez Abella
We develop a reduction theory for G-invariant Lagrangian field theories defined on the higher-order jet bundle of a principal G-bundle, thus obtaining the higher-order Euler–Poincaré field equations. To that end, we transfer the Hamilton's principle to the reduced configuration bundle, which is identified with the bundle of flat connections (up to a certain order) of the principal G-bundle. As a result, the reconstruction condition is always satisfied and, hence, every solution of the reduced field equations locally comes from a solution of the original (unreduced) equations. Furthermore, the reduced equations are shown to be equivalent to the conservation of the Noether current. Lastly, we illustrate the theory by investigating multivariate higher-order splines on Lie groups.
{"title":"Higher-order Euler–Poincaré field equations","authors":"Marco Castrillón López , Álvaro Rodríguez Abella","doi":"10.1016/j.geomphys.2025.105693","DOIUrl":"10.1016/j.geomphys.2025.105693","url":null,"abstract":"<div><div>We develop a reduction theory for <em>G</em>-invariant Lagrangian field theories defined on the higher-order jet bundle of a principal <em>G</em>-bundle, thus obtaining the higher-order Euler–Poincaré field equations. To that end, we transfer the Hamilton's principle to the reduced configuration bundle, which is identified with the bundle of flat connections (up to a certain order) of the principal <em>G</em>-bundle. As a result, the reconstruction condition is always satisfied and, hence, every solution of the reduced field equations locally comes from a solution of the original (unreduced) equations. Furthermore, the reduced equations are shown to be equivalent to the conservation of the Noether current. Lastly, we illustrate the theory by investigating multivariate higher-order splines on Lie groups.</div></div>","PeriodicalId":55602,"journal":{"name":"Journal of Geometry and Physics","volume":"219 ","pages":"Article 105693"},"PeriodicalIF":1.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145529318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-04DOI: 10.1016/j.geomphys.2025.105692
Shuping Huang , Xiaoming Zhu
This paper presents multi-component integrable generalizations of both the positive and negative (2+1)-dimensional Ablowitz-Kaup-Newell-Segur (AKNS) hierarchies, associated with the A.III, BD.I, C.I, and D.III classes of irreducible Hermitian symmetric spaces. Utilizing recursive operators and symmetric reductions, it is demonstrated that, with two exceptions, the -flow of each (2+1)-dimensional multi-component AKNS hierarchy, corresponding to an irreducible Hermitian symmetric space, can be decomposed into the - and -flows of the respective (1+1)-dimensional multi-component AKNS hierarchy. These results reveal the structural connections between (1+1)- and (2+1)-dimensional integrable hierarchies, offering a rigorous basis for further investigations of multi-component hierarchies arising from Hermitian symmetric spaces.
本文给出了与不可约密尔对称空间的A.III, BD.I, c.i.和D.III类相关的正(2+1)维ablowitz - kap - newwell - segur (AKNS)层次的多分量可积推广。利用递归算子和对称约简,证明了在两个例外情况下,对应于不可约厄米对称空间的每个(2+1)维多分量AKNS层次的(n2−n1+1)-流可以分解为各自(1+1)维多分量AKNS层次的n1-流和n2-流。这些结果揭示了(1+1)-和(2+1)维可积层次之间的结构联系,为进一步研究厄米对称空间中产生的多分量层次提供了严格的基础。
{"title":"Positive and negative (2+1)-dimensional multi-component AKNS hierarchies associated with Hermitian symmetric spaces and their integrable decompositions","authors":"Shuping Huang , Xiaoming Zhu","doi":"10.1016/j.geomphys.2025.105692","DOIUrl":"10.1016/j.geomphys.2025.105692","url":null,"abstract":"<div><div>This paper presents multi-component integrable generalizations of both the positive and negative (2+1)-dimensional Ablowitz-Kaup-Newell-Segur (AKNS) hierarchies, associated with the A.III, BD.I, C.I, and D.III classes of irreducible Hermitian symmetric spaces. Utilizing recursive operators and symmetric reductions, it is demonstrated that, with two exceptions, the <span><math><mo>(</mo><msub><mrow><mi>n</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>−</mo><msub><mrow><mi>n</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>+</mo><mn>1</mn><mo>)</mo></math></span>-flow of each (2+1)-dimensional multi-component AKNS hierarchy, corresponding to an irreducible Hermitian symmetric space, can be decomposed into the <span><math><msub><mrow><mi>n</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span>- and <span><math><msub><mrow><mi>n</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>-flows of the respective (1+1)-dimensional multi-component AKNS hierarchy. These results reveal the structural connections between (1+1)- and (2+1)-dimensional integrable hierarchies, offering a rigorous basis for further investigations of multi-component hierarchies arising from Hermitian symmetric spaces.</div></div>","PeriodicalId":55602,"journal":{"name":"Journal of Geometry and Physics","volume":"219 ","pages":"Article 105692"},"PeriodicalIF":1.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145442560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-13DOI: 10.1016/j.geomphys.2025.105709
Manuel Gutiérrez , Raymond A. Hounnonkpe
We study the influence of the existence of totally geodesic null hypersurface on the properties of a Lorentzian manifold. By coupling the rigging technique with the existence of a null foliation we prove the existence of a Riemann flow structure which allows us to use some powerful results to show how curvature conditions on the spacetime restrict its causal structure. We also study the existence of periodic null or spacelike geodesic.
{"title":"Riemannian flow techniques on totally geodesic null hypersurfaces","authors":"Manuel Gutiérrez , Raymond A. Hounnonkpe","doi":"10.1016/j.geomphys.2025.105709","DOIUrl":"10.1016/j.geomphys.2025.105709","url":null,"abstract":"<div><div>We study the influence of the existence of totally geodesic null hypersurface on the properties of a Lorentzian manifold. By coupling the rigging technique with the existence of a null foliation we prove the existence of a Riemann flow structure which allows us to use some powerful results to show how curvature conditions on the spacetime restrict its causal structure. We also study the existence of periodic null or spacelike geodesic.</div></div>","PeriodicalId":55602,"journal":{"name":"Journal of Geometry and Physics","volume":"219 ","pages":"Article 105709"},"PeriodicalIF":1.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-19DOI: 10.1016/j.geomphys.2025.105710
Ana Carolina Mançur
We verify that LA-Courant algebroids provide the Manin triple framework for double Lie bialgebroids. Specifically, we establish a correspondence between double Lie bialgebroids and LA-Manin triples, i.e., LA-Courant algebroids equipped with a pair of complementary LA-Dirac structures. As an application, LA-Courant algebroids and CA-groupoids given by Drinfeld doubles are shown to correspond via integration and differentiation.
{"title":"Manin triples for double Lie bialgebroids","authors":"Ana Carolina Mançur","doi":"10.1016/j.geomphys.2025.105710","DOIUrl":"10.1016/j.geomphys.2025.105710","url":null,"abstract":"<div><div>We verify that LA-Courant algebroids provide the Manin triple framework for double Lie bialgebroids. Specifically, we establish a correspondence between double Lie bialgebroids and LA-Manin triples, i.e., LA-Courant algebroids equipped with a pair of complementary LA-Dirac structures. As an application, LA-Courant algebroids and CA-groupoids given by Drinfeld doubles are shown to correspond via integration and differentiation.</div></div>","PeriodicalId":55602,"journal":{"name":"Journal of Geometry and Physics","volume":"219 ","pages":"Article 105710"},"PeriodicalIF":1.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145576284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-19DOI: 10.1016/j.geomphys.2025.105718
Oleg Ogievetsky , Pavel Pyatov
For the family of the orthogonal quantum matrix algebras we investigate the structure of their characteristic subalgebras — special commutative subalgebras, which for the subfamily of the reflection equation algebras appear to be central. In [35] we described three generating sets of the characteristic subalgebras of the symplectic and orthogonal quantum matrix algebras. One of these — the set of the elementary sums — is finite. In the symplectic case the elementary sums are in general algebraically independent. On the contrary, in the orthogonal case the elementary sums turn out to be dependent. We obtain a set of quadratic relations for these generators. We call these relations ‘reciprocal’ because they lie at the heart of the reciprocal (sometimes called palindromic) property of the characteristic polynomial of the orthogonal quantum matrices. Next, we resolve the reciprocal relations for the quantum orthogonal matrix algebra extended by the inverse of the quantum matrix. As an auxiliary result, we derive the commutation relations between the q-determinant of the quantum orthogonal matrix and the generators of the quantum matrix algebra, that is, the components of the quantum matrix.
{"title":"Reciprocal relations for orthogonal quantum matrices","authors":"Oleg Ogievetsky , Pavel Pyatov","doi":"10.1016/j.geomphys.2025.105718","DOIUrl":"10.1016/j.geomphys.2025.105718","url":null,"abstract":"<div><div>For the family of the orthogonal quantum matrix algebras we investigate the structure of their characteristic subalgebras — special commutative subalgebras, which for the subfamily of the reflection equation algebras appear to be central. In <span><span>[35]</span></span> we described three generating sets of the characteristic subalgebras of the symplectic and orthogonal quantum matrix algebras. One of these — the set of the elementary sums — is finite. In the symplectic case the elementary sums are in general algebraically independent. On the contrary, in the orthogonal case the elementary sums turn out to be dependent. We obtain a set of quadratic relations for these generators. We call these relations ‘reciprocal’ because they lie at the heart of the reciprocal (sometimes called palindromic) property of the characteristic polynomial of the orthogonal quantum matrices. Next, we resolve the reciprocal relations for the quantum orthogonal matrix algebra extended by the inverse of the quantum matrix. As an auxiliary result, we derive the commutation relations between the <em>q</em>-determinant of the quantum orthogonal matrix and the generators of the quantum matrix algebra, that is, the components of the quantum matrix.</div></div>","PeriodicalId":55602,"journal":{"name":"Journal of Geometry and Physics","volume":"219 ","pages":"Article 105718"},"PeriodicalIF":1.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01Epub Date: 2025-10-10DOI: 10.1016/j.geomphys.2025.105674
Alexander Polishchuk
We study the standard family of supercurves of genus 1 with underlying odd spin structures. We give a simple algebraic description of this family and of the compactified family of stable supercurves with one Neveu-Schwarz puncture. We also describe the Gauss-Manin connection on the 1st de Rham cohomology of this family, and compute the superperiods of global differentials.
研究了具有奇自旋结构的1属超曲线标准族。我们给出了这个族和具有一个Neveu-Schwarz穿孔的紧化稳定超曲线族的简单代数描述。我们还描述了这个族的第1 de Rham上同调上的gaas - manin连接,并计算了全局微分的超周期。
{"title":"On supercurves of genus 1 with an underlying odd spin structure","authors":"Alexander Polishchuk","doi":"10.1016/j.geomphys.2025.105674","DOIUrl":"10.1016/j.geomphys.2025.105674","url":null,"abstract":"<div><div>We study the standard family of supercurves of genus 1 with underlying odd spin structures. We give a simple algebraic description of this family and of the compactified family of stable supercurves with one Neveu-Schwarz puncture. We also describe the Gauss-Manin connection on the 1st de Rham cohomology of this family, and compute the superperiods of global differentials.</div></div>","PeriodicalId":55602,"journal":{"name":"Journal of Geometry and Physics","volume":"218 ","pages":"Article 105674"},"PeriodicalIF":1.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145321866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}