## Method of integrating factors

Is there a method of integrating factors for differential equations of power 2 or higher?

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 "power" in the sense of second or higher derivatives? Probably not. Integrating factors are for first-order DEs.
 Integrating factors are are suit for any order ODEs, see, e.g., http://www.emis.de/journals/SIGMA/2006/Paper059/ Knowing integrating factor allows to reduce the ODE order.

## Method of integrating factors

Thank you very much! :)