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A simple scaling yields a more compact form for the ODE
system (6.19). An appropriate choice is

(6.14) 
By introducing the Kronecker symbol^{b}
the
ODEs write to
whereby the coefficients are given by
Footnotes
 ... symbol^{b}
 The Kronecker symbol is defined as
= 1 for n = m and 0 otherwise.
Heinrich Kirchauer, Institute for Microelectronics, TU Vienna
19980417