0
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ℒ = -1/2 Laplacian[u[x], {x}] + V[x] u[x]; 

sort[
 NDEigenvalues[
   ℒ, u[x], {x, 0, 1}, 5, 
   Method -> {"SpatialDiscretization" -> {"FiniteElement", "MeshOptions" -> {"MaxCellMeasure" -> 0.001}}}
 ]
]

I am trying to solve numerically a 2nd order ordinary differential equation. This does not work with Mathematica 10.00?

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NDEigensystem was added in version 10.2 (or was it 10.3?) but version 10.0 is not going to work unless you use this.

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