Bulletin of the Iranian Mathematical Society

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A Classification of Cohomogeneity One Actions on the Minkowski Space $$\mathbb {R}^{3,1}$$
Bulletin of the Iranian Mathematical Society - Tập 47 - Trang 1905-1924 - 2020
Parviz Ahmadi, Salim Safari, Masoud Hassani
The aim of this paper is to classify cohomogeneity one isometric actions on the 4-dimensional Minkowski space $$\mathbb {R}^{3,1}$$ , up to orbit equivalence. Representations, up to conjugacy, of the acting groups in $$O(3,1) < i...... hiện toàn bộ
Chuyển đổi Tính chất Star-C-Hurewicz trong các Không gian Tôpô Dịch bởi AI
Bulletin of the Iranian Mathematical Society - Tập 46 - Trang 1101-1115 - 2019
Manoj Bhardwaj, B. K. Tyagi, Sumit Singh
Trong bài báo này, chúng tôi đã giới thiệu tính chất relatively star-C-Hurewicz trong các không gian tôpô theo phương pháp của Bonanzinga và Pansera (Acta Math Hungar 117(3):231–243, 2007) và Guido và Kočinac (Quest Answ Gen Topol 19:107–114, 2001). Một không gian con A của một không gian tôpô X được gọi là có tính chất relatively star-C-Hurewicz trong X (viết tắt là RSCH) hoặc không gian con star...... hiện toàn bộ
#tính chất Hurewicz #không gian tôpô #tính chất star-C-Hurewicz #không gian con #tập compact
A Class of Finsler Metrics with Quadratic Curvatures
Bulletin of the Iranian Mathematical Society - Tập 46 - Trang 53-65 - 2019
Bahman Rezaei, Mehran Gabrani
Finsler metrics of quadratic curvatures form a rich and important class of metrics. In this paper, we study spherically symmetric metrics of quadratic curvatures. We find equations that characterize R-quadratic spherically symmetric Finsler metrics. In addition, we find the necessary and sufficient conditions for the metrics to be W-quadratic and Ricci-quadratic types.
On a Class of Critical p-Biharmonic Kirchhoff Type Problems with Indefinite Weights
Bulletin of the Iranian Mathematical Society - Tập 47 - Trang 1207-1225 - 2020
Nguyen Thanh Chung
Using the genus theory introduced by Krasnoselskii and a variant of the mountain pass theorem due to Rabinowitz [24], we study the existence of solutions for the following Kirchhoff type problem: $$\begin{aligned} {\left\{ \begin{array}{ll} M\left( \int _\Omega |\Delta u|^p\,\mathrm{d}x\right) \Delta \Big (|\Delta u|^{p{-}2}\De...... hiện toàn bộ
The Selectively Pseudocompact-Open Topology on C(X)
Bulletin of the Iranian Mathematical Society - Tập 47 - Trang 1611-1628 - 2020
Juan Alberto Martínez-Cadena, Ángel Tamariz-Mascarúa
This paper studies the selectively pseudocompact-open topology on the set of the real-valued continuous functions on a Tychonoff space, and compares this topology with the $$\alpha $$ -open topology and the topology of uniform convergence on the elements of ...... hiện toàn bộ
On the Entropy Formulas and Solitons for the Ricci-Harmonic Flow
Bulletin of the Iranian Mathematical Society - Tập 45 - Trang 1177-1192 - 2019
Abimbola Abolarinwa, Nathaniel K. Oladejo, Sulyman O. Salawu
This paper is concerned with entropy monotonicity formulas and classification of gradient almost soliton for Ricci-harmonic flow. The new entropy formulas introduced here are monotone in general along the flow and constant exactly on shrinker or expander as the case may be. The consequence of this is the nonexistence of periodic solutions except those that are gradient solitons. Furthermore, the p...... hiện toàn bộ
On Semi-prime Rings with Generalized Derivations
Bulletin of the Iranian Mathematical Society - - 2021
Ibtesam Alshammari, Rania Kammoun
Galois $$E_6$$-Bundles over a Hyperelliptic Algebraic Curve
Bulletin of the Iranian Mathematical Society - Tập 49 Số 4 - 2023
Álvaro Antón‐Sancho
Biconservative Hypersurfaces in Euclidean 5-Space
Bulletin of the Iranian Mathematical Society - Tập 45 - Trang 1117-1133 - 2019
Ram Shankar Gupta
We prove that every biconservative hypersurface M in $$\mathbb {E}^5$$ with constant norm of second fundamental form has constant mean curvature.
Some Bounds of Eigenvalues for Hadamard Product and Fan Product of Tensors
Bulletin of the Iranian Mathematical Society - Tập 46 - Trang 1003-1026 - 2019
Yangyang Xu, Bing Zheng, Ruijuan Zhao
In this paper, some new upper bounds on the spectral radius of Hadamard product of nonnegative tensors are given. To show their sharpness, the comparisons among these bounds, including the existing one by Sun et al. (Linear Multilinear Algebra 66:1199–1214, 2018), are performed. We also present some lower bounds on the minimum eigenvalue of Fan product of irreducible strong $${{\mathcal {M}}}$$ ...... hiện toàn bộ
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