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- W2617102922 abstract "This paper first discusses irreducibility of a Painlev'e equation $P$. We explain how the Painlev'e property is helpful for the computation of special classical and algebraic solutions. As in a paper of Morales-Ruiz we associate an autonomous Hamiltonian $mathbb{H}$ to a Painlev'e equation $P$. Complete integrability of $mathbb{H}$ is shown to imply that all solutions to $P$ are classical (which includes algebraic), so in particular $P$ is solvable by ''quadratures''. Next, we show that the variational equation of $P$ at a given algebraic solution coincides with the normal variational equation of $mathbb{H}$ at the corresponding solution. Finally, we test the Morales-Ramis theorem in all cases $P_{2}$ to $P_{5}$ where algebraic solutions are present, by showing how our results lead to a quick computation of the component of the identity of the differential Galois group for the first two variational equations. As expected there are no cases where this group is commutative." @default.
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- W2617102922 date "2019-11-09" @default.
- W2617102922 modified "2023-09-27" @default.
- W2617102922 title "Variations for Some Painlevé Equations" @default.
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- W2617102922 doi "https://doi.org/10.3842/sigma.2019.088" @default.
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