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International Mathematics Research Papers (2005) 2005:565-635, doi:10.1155/IMRP.2005.565
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Copyright © 2005 Hindawi Publishing Corporation. All rights reserved.

Isomonodromic deformation of resonant rational connections

M. Bertola and M. Y. Mo

We analyze isomonodromic deformations of rational connections on the Riemann sphere with Fuchsian and irregular singularities. The Fuchsian singularities are allowed to be of arbitrary resonance index; the irregular singularities are also allowed to be resonant in the sense that the leading coefficient matrix at each singularity may have arbitrary Jordan canonical form, with a genericity condition on the Lidskii submatrix of the subleading term. We also give the relevant notion of isomonodromic tau function extending the one given for nonresonant deformations by Jimbo, Miwa, and Ueno. The tau function is expressed purely in terms of spectral invariants of the matrix of the connection.


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