Exponential infinite-product representations of the time-displacement operator
Serge Klarsfeld, J A Oteo · Journal of Physics A Mathematical and General · 1989
Fer's infinite-product expansion (1958) is reconsidered and applied to the specific case of the time-displacement operator in quantum mechanics. An alternative version of this expansion due to Wilcox is also discussed and found to be quite different from the original one. In general the latter is expected to possess better convergence properties.