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Uh...sources?

the sources which i added talks about evolution operators ,but i am not sure if they are consistent with the aproach used in the articleLamaO (talk) 08:16, 17 February 2009 (UTC)Reply[reply]

I added one citation concerning discretization of time; there are many materials on time evolution but most are in lectures and almost all are in quantum systems. Lantonov (talk) 06:44, 25 October 2020 (UTC)Reply[reply]

Also added two references on classical systems from dynamic systems theory. Lantonov (talk) 07:32, 25 October 2020 (UTC)Reply[reply]