Todd Wayman (Forever a student) Yes, I know that was just the cut and paste from my work sheet, it formated the expression as if expanded. I actually made it real compact. PDETools[declare](y(x),y',prime=x); now they are simply: y'''' Thanks again.

Subs did the trick. subs(_C1 = C[1], _C2 = C[2], _C3 = C[3], _C4 = C[4], dsolve((diff(diff(diff(diff(y(x), x), x), x), x))+(diff(diff(diff(y(x), x), x), x))+(diff(diff(y(x), x), x)) = 0)); Thanks again!

No offence taken I have just started using Maple, seems like a very cool package, though I'm sure there are a lot of nuances I need to become accustom. So, with that in mind I doubt this is the last inquisitive, maybe perplexing, post I’ll be making. Thanks a lot for your input. I have much to think over and learn. See you around!