2.1855   ODE No. 1855

\[ y^{(n)}(x)-f\left (\frac {\partial ^{n-2}y(x)}{\partial x^{n-2}}\right )=0 \]

✗ Mathematica : cpu = 0.0051772 (sec), leaf count = 0

DSolve[-f[D[y[x], {x, -2 + n}]] + Derivative[n][y][x] == 0,y[x],x]
 

, could not solve

DSolve[-f[D[y[x], {x, -2 + n}]] + Derivative[n][y][x] == 0, y[x], x]

✗ Maple : cpu = 0. (sec), leaf count = 0

dsolve(diff(y(x),[x $ n]) = f(diff(y(x),[x $ n-2]))=0,y(x))
 

, exception

unable to handle ODEs of undefined differential order