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Please see this short tutorial on using the output of fucntions like Solve, NSolve, and DSolve: http://support.wolfram.com/kb/3825 |
Would anyone be able to take a few moments and ask someone who knows how to interpret Solve::ifun: Inverse functions are being used by Solve, so some solutions may not be found; use Reduce for complete solution informationto... |
I would suspect at some point in your session y[1] was set to be equal to 1, which then makes y[1]==1 evaluate to True, and that is not really an equation. Try [mcode]Clear[y]; DSolve[{y'[x] == (x^2 + x y[x] + 4 y[x]^2)/x^2, y[1] == 1}, y[x],... |