On Expanding the Exponential
- 1 December 1965
- journal article
- research article
- Published by AIP Publishing in Journal of Mathematical Physics
- Vol. 6 (12) , 1928-1934
- https://doi.org/10.1063/1.1704742
Abstract
Systematic methods for generating various expansions of the function exp (a + λb)t, of noncommuting operators a and b, are presented. The usual perturbation expansion in powers of λ, and several other formulas found in the earlier literature occur as special cases. Brief remarks about relative merits and physical applications are made.Keywords
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