Can you give a concrete example of what you would like the output to
be? Do you want a single solution for symbolic n, or just a function
that takes a specific number n as input and gives an output?

Also, what are your base cases?

Aaron Meurer

On Sat, Mar 2, 2013 at 6:54 PM,  <[email protected]> wrote:
> Hi,
> I have a system of recurrent relationships, like the following (simplified
> example):
>
> a = Function('a')
> b = Function('b')
> k = Symbol('k', integer=True)
>
> a(k+1) == b(k+1,k)*a(k) + 2*b(k+1,k)
> b(k+2,k) == b(k+2,k+1)*b(k+1,k)
>
> Is it possible to give these to SymPy and have it automatically figure out
> what (a(k+n) - a(k)) would look like for some arbitrary integer n?    I
> don't know what this operation is called in SymPy terms, so no idea where to
> start...
>
> Thanks!
>
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