... eigenfunction

The differences between Eq. (1) and the Eq. (2.14) of Papaloizou & Pringle (1985) are due to a different definition of the corotation frequency $\sigma$.

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...$\vec{\xi}_A$

In the case of Jordan chain modes the expansion (5) must be completed by the associated Jordan-chain vectors (see Schenk et al. 2002).

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