EXACT POWER SERIES SOLUTIONS FOR AXISYMMETRIC VIBRATIONS OF CIRCULAR AND ANNULAR MEMBRANES WITH CONTINUOUSLY VARYING DENSITY IN THE GENERAL CASE

2002 ◽  
Vol 258 (5) ◽  
pp. 981-986 ◽  
Author(s):  
M. WILLATZEN
Keyword(s):  
Power Series ◽  
Series Solutions ◽  
Exact Power ◽  
Power Series Solutions

scholarly journals Lie Symmetry Analysis, Conservation Laws, Power Series Solutions, and Convergence Analysis of Time Fractional Generalized Drinfeld-Sokolov Systems

Symmetry ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 874
Author(s):  
Selahattin Gülşen ◽  
Shao-Wen Yao ◽  
Mustafa Inc
Keyword(s):  
Power Series ◽  
Conservation Laws ◽  
Group Analysis ◽  
Nonlinear Ordinary Differential Equation ◽  
Series Solutions ◽  
Nonlinear Odes ◽  
Fractional Differential Operator ◽  
Exact Power ◽  
Power Series Solutions ◽  
Fractional Differential

In this work, we investigate invariance analysis, conservation laws, and exact power series solutions of time fractional generalized Drinfeld–Sokolov systems (GDSS) using Lie group analysis. Using Lie point symmetries and the Erdelyi–Kober (EK) fractional differential operator, the time fractional GDSS equation is reduced to a nonlinear ordinary differential equation (ODE) of fractional order. Moreover, we have constructed conservation laws for time fractional GDSS and obtained explicit power series solutions of the reduced nonlinear ODEs that converge. Lastly, some figures are presented for explicit solutions.

A symmetry-preserving difference scheme and analytical solutions of a generalized higher-order beam equation

2021 ◽  
Vol 477 (2255) ◽  
Author(s):  
Shou-Fu Tian ◽  
Mei-Juan Xu ◽  
Tian-Tian Zhang
Keyword(s):  
Power Series ◽  
Vector Fields ◽  
Higher Order ◽  
Beam Equation ◽  
Series Solutions ◽  
Local Conservation ◽  
Power Series Method ◽  
Potential System ◽  
Power Series Solutions ◽  
The Difference

Under investigation in this work is a generalized higher-order beam equation, which is an important physical model and describes the vibrations of a rod. By considering Lie symmetry analysis, and using the power series method, we derive the geometric vector fields, symmetry reductions, group invariant solutions and power series solutions of the equation, respectively. The convergence analysis of the power series solutions are also provided with detailed proof. Furthermore, by virtue of the multipliers, the local conservation laws of the equation are derived as well. Furthermore, an effective and direct approach is proposed to study the symmetry-preserving discretization for the equation via its potential system. Finally, the invariant difference models of the generalized beam equation are successfully constructed. Our results show that it is very useful to construct the difference models of the potential system instead of the original equation.

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