Thanks for the feedback Le mardi 26 juin 2012 16:08:50 UTC+2, Stefan Krastanov a écrit : > > The problem is that Subs is not smart enough to know that it contains > only a derivative. Changing the variables will help as it will remove > the need for Subs (substituting t-x -> y). Maybe it would be > appropriate to file a bug report with this. > > I didn't get exactly what the bug report should be file against ?
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