Problem with a boundary value problem non linear

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i've some problem to solve this kind of differential equation, i 've put the link where is the file of my equation, i search a methods that solve it iterativly.


the file is there diablo221 .altervista.org / risultato. nb
 
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Um, what kind of file extension is .nb? I can't open it.
 
it's for mathematica
 
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