Splitting methods with complex coefficients by Sergio Blanes and others 2026-11-05
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Verified author list and archive history: arxiv.org/abs/1001.1549
Consulted passages: section1, equation(5), printed p2, symmetric second-order splitting; equation(11) and following negative-step discussion, printed pp3–4. Archive abstract records submission10January2010 and journal reference Bol.Soc.Esp.Mat.Apl.50(2010),47–61. The fetched PDF separately displays25April2022 on its title page; do not equate that displayed typesetting date with first publication.
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