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On the basis of quantum field theory, we consider a unified description ofvarious processes accompanied by neutrinos, namely weak decays and oscillationprocesses. The structures of the expectation values of flavor-neutrino numberswith respect to neutrino-source hadron state are investigated. Due to thesmallness of neutrino masses, we naturally obtain the old (i.e. pre-mixing)formulas of decay probabilities. Together, it is shown that the oscillationformulas, similar to the usual ones, are applied irrespectively of the detailsof neutrino-producing processes. The derived oscillation formulas are the samein form as the usually used ones except for the oscillation length.

Expectation values of flavor-neutrino numbers with respect to neutrino-source hadron states --Neutrino oscillations and decay probabilities--