Timeline for Which differential equations allow for a variational formulation?
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| Feb 6, 2016 at 2:27 | comment | added | Igor Khavkine | I don't see a direct link between formal integrability (which could be determined from Spencer-Quillen sufficient conditions, as you write) and the inverse problem of the calculus of variations, other than that just having more information about the equation is a good thing. So I don't see how those particular references are relevant here. | |
| Feb 5, 2016 at 21:55 | review | Late answers | |||
| Feb 5, 2016 at 22:03 | |||||
| Feb 5, 2016 at 21:36 | history | answered | jdelgado | CC BY-SA 3.0 |