Abstract
For the Painlevé VI transcendents, we provide a unitary description of the critical behaviours, the connection formulae, their complete tabulation, and the asymptotic distribution of poles close to a critical point.
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Notes
This differs from the terminology of singularity theory, where a critical point is a zero of the first derivative of a function.
Note that, in general, for a series like (37), one expects convergence for \(0<|x|<r\) and \(|x^{n+2im\nu }e^{im\phi }|<\epsilon _{nm}\), where \(r,~\epsilon _{nm}>0\) are sufficiently small. Thus
$$\begin{aligned} \ln |x|-\mathfrak {I}\phi +\max \Biggl \{-\ln r,\sup _{m>0,n\ge 1}\left| {\ln \epsilon _{nm}\over m} \right| \Biggr \} < 2\nu \arg x < -\mathfrak {I}\phi +\min \Biggl \{\ln r,\inf _{m<0,n\ge 1}\left| {\ln \epsilon _{nm}\over m} \right| \Biggr \}. \end{aligned}$$\( \mathcal{A}^2={\bigl [(1-\sigma )^2-(\theta _\infty -1-\theta _1)^2\bigr ]\bigl [(1-\sigma )^2-(\theta _\infty -1+\theta _1)^2\bigr ] \over 4(1-\sigma )^2}, \) \( \mathcal{B}={(\theta _\infty -1)^2-\theta _1^2+(1-\sigma )^2\over 2(1-\sigma )^2}\).
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Communicated by Percy Deift and Alexander Its.
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Guzzetti, D. A Review of the Sixth Painlevé Equation. Constr Approx 41, 495–527 (2015). https://doi.org/10.1007/s00365-014-9250-6
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DOI: https://doi.org/10.1007/s00365-014-9250-6