P. G. L. Leach

A direct approach to finding exact invariants for one-dimensional time-dependent classical Hamiltonians

Harry R. Lewis, P. G. L. Leach · Journal of Mathematical Physics · 1982 · 198 citations

Spectral Theory, Hamiltonian Theory, Direct Approach +7

Symmetry Lie algebras of nth order ordinary differential equations

F. M. Mahomed, P. G. L. Leach · Journal of Mathematical Analysis and Applications · 1990 · 168 citations

Lie Point Symmetry, Lie Theory, Lie Algebra +1

The Ermakov equation: A commentary

P. G. L. Leach, S.K. Andriopoulos · Applicable Analysis and Discrete Mathematics · 2008 · 120 citations · Full text

Backlund Transformation, Global Analysis, Geometric Singular Perturbation Theory +5

First integrals for the modified Emden equation <i>q</i>+α(<i>t</i>) <i>q</i>+<i>q</i> <i>n</i> =0

P. G. L. Leach · Journal of Mathematical Physics · 1985 · 116 citations

The Jacobi Last Multiplier and its applications in mechanics

M. C. Nucci, P. G. L. Leach · Physica Scripta · 2008 · 104 citations