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Oct 16, 2021 at 22:15 comment added Ilovemath I didn't quite understand, the maximum principle I know is about keeping the initial data inequalities for the corresponding solutions, so I can't see how to relate this to solution time, at least not from this version I know.
Oct 15, 2021 at 18:26 comment added Math604 i assume it must be maximum principle. Can one show if the solution blows up it must blow up to $+\infty$ and not $-\infty$ ? IF so maybe you can use one as a supersolution for the other to give desired...
Oct 15, 2021 at 14:30 history asked Ilovemath CC BY-SA 4.0