Talk:Quasi-birth–death process

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I think the definition of quasi-birth-and-death-processes is given wrong. Quasi-Birth-and-Death-Processes are CTMC's where the generator is a block tridiagonal matrix, where blocks repeat in a specific manner. in the reference given there is no word spoken about QBD-processes to be a semi markov process in general. Syngola (talk) 18:13, 7 August 2011 (UTC)