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Nov 27, 2014 at 2:37 history made wiki Post Made Community Wiki by Todd Trimble
Nov 25, 2014 at 19:10 comment added Tom Copeland Hausdorff (1906) via Iserles, "Expansions that grow on trees": Matrix diff. eqn. ${Y}'= A(t)\; Y$ with change of variables $Y(t)=e^{\Omega(t)}$ becomes ${\Omega}'=exp[B.\;ad_{\Omega}]A=\frac{ad_{\Omega}}{e^{ad_{\Omega}-1}}A\;.$ citeseerx.ist.psu.edu/viewdoc/…
Apr 11, 2011 at 9:36 history answered Stefan Waldmann CC BY-SA 3.0