Can I solve the discreate ODE by considering the continuous case?

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The discussion centers on the relationship between the discrete Lattice Schrödinger Equation (LSE) and its continuous counterpart. The LSE represents a discrete case defined on N lattices, prompting the inquiry into whether solving the continuous version can yield insights for the discrete scenario. Key questions raised include the nature of the discretization—whether it pertains to space, time, or both—and whether the equation employs an approximation of the derivative or adheres to standard difference equation principles.

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There is a linear version of so-called lattice Schrödinger equation (LSE), it is just a variation form of nonlinear Schrödinger equation. But the LSE is the discrete case on N lattices. I wonder if I can solve the continuous case and then take the solution at specific lattice for the discrete case?
 
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Well first of all I'd like to see the equation.
What is discrete in the equation, space? time? both?
Does it involve an approximation of the derivative or is it a "standart" difference equation?
 

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