Abstract
We derive the Lagrangians of the reduced fourth-order ordinary differential equations studied by Kudryashov, when they satisfy the conditions stated by Fels [Fels ME, The inverse problem of the calculus of variations for scalar fourth-order ordinary differential equations. Trans Am Math Soc 1996;348:5007-29] using Jacobi's last multiplier technique. In addition the Hamiltonians of these equations are derived via Jacobi-Ostrogradski's theory. In particular, we compute the Lagrangians and Hamiltonians of fourth-order Kudryashov equations which pass the Painlevé test.
Original language | British English |
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Pages (from-to) | 3914-3922 |
Number of pages | 9 |
Journal | Communications in Nonlinear Science and Numerical Simulation |
Volume | 16 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2011 |
Keywords
- Fourth-order ordinary differential equations
- Inverse problem of calculus of variations
- Jacobi last multiplier
- Jacobi-Ostrogradski's method
- Lagrangian