The paper gives necessary conditions for algebraic ODEs to have complex Pfaffian solutions, examples without real Pfaffian solutions, a sufficient condition for d-irreducibility, and answers to open questions in the area.
Internality of logarithmic-differential pullbacks.Transactions of the American Mathematical Society, 373(7):4863–4887
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Special classes of functions
The paper gives necessary conditions for algebraic ODEs to have complex Pfaffian solutions, examples without real Pfaffian solutions, a sufficient condition for d-irreducibility, and answers to open questions in the area.