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
$$O(3,1) < i...... hiện toàn bộ
On the Entropy Formulas and Solitons for the Ricci-Harmonic FlowBulletin of the Iranian Mathematical Society - Tập 45 - Trang 1177-1192 - 2019
Abimbola Abolarinwa, Nathaniel K. Oladejo, Sulyman O. Salawu
This paper is concerned with entropy monotonicity formulas and classification of gradient almost soliton for Ricci-harmonic flow. The new entropy formulas introduced here are monotone in general along the flow and constant exactly on shrinker or expander as the case may be. The consequence of this is the nonexistence of periodic solutions except those that are gradient solitons. Furthermore, the p...... hiện toàn bộ
Biconservative Hypersurfaces in Euclidean 5-SpaceBulletin of the Iranian Mathematical Society - Tập 45 - Trang 1117-1133 - 2019
Ram Shankar Gupta
We prove that every biconservative hypersurface M in
$$\mathbb {E}^5$$
with constant norm of second fundamental form has constant mean curvature.
On the Well-Posedness of the Incompressible Viscoelastic FlowsBulletin of the Iranian Mathematical Society - Tập 45 - Trang 13-22 - 2018
Yinxia Wang
In this short article, the initial value problem for the incompressible viscoelastic flows is investigated in
$$\mathbb {R}^n(n=2, 3)$$
. Local well-posedness in nearly optimal Sobolev spaces is established.
Characteristic and IA-Invariant RadicalsBulletin of the Iranian Mathematical Society - Tập 47 - Trang 341-349 - 2020
Mohammad Samadi, Mohammad Shahryari
In this article, we study systems of coefficient-free equations over special classes of groups, their radicals in which are characteristic or IA-invariant subgroups of the free group.