Talk:Engineering Analysis/Matrix Exponentials

Shouldn't $$e^{A}$$ expand to $$e^{A} = 1 + A + \frac{1}{2}A^2 + \frac{1}{6}A^3 + ... $$ instead of $$e^{A} = A + \frac{1}{2}A^2 + \frac{1}{6}A^3 + ... $$ where $$1$$ is the identity matrix of adequate dimension?


 * Yes, that seems correct to me. I would have to look it up though, to make sure i'm not missing some detail. --Whiteknight (talk) 13:30, 22 May 2007 (UTC)


 * fixed. You're right -- see matrix exponential. --DavidCary (talk) 16:46, 9 October 2008 (UTC)

It says in the article that sums of matrices in the exponent can't be separated. This isn't true if the matrices commute. See http://en.wikipedia.org/wiki/Matrix_exponential#The_exponential_of_sums Is this deliberately left out? --213.100.169.83 (discuss) 00:15, 15 October 2013 (UTC)