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On the convergence of exponential operators—the Zassenhaus formula, BCH formula and systematic approximants

✍ Scribed by Masuo Suzuki


Publisher
Springer
Year
1977
Tongue
English
Weight
318 KB
Volume
57
Category
Article
ISSN
0010-3616

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On the convergence and optimization of t
✍ Sergio Blanes; Fernando Casas 📂 Article 📅 2004 🏛 Elsevier Science 🌐 English ⚖ 296 KB

In this paper the problem of the convergence of the Baker-Campbell-Hausdorff series for Z = log(e X e Y ) is revisited. We collect some previous results about the convergence domain and present a new estimate which improves all of them. We also provide a new expression of the truncated Lie presentat