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Supplement to the paper ``Quasianalytic perturbation of multi-parameter hyperbolic polynomials and symmetric matrices'' (Ann. Polon. Math. 101 (2011), 275โ291)
In IMUJ Preprint 2009/05 we investigated the quasianalytic perturbation of hyperbolic polynomials and symmetric matrices by applying our quasianalytic version of the Abhyankar–Jung theorem from IMUJ Preprint 2009/02, whose proof relied on a theorem