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$\def\left{\operatorname{left}}\def\right{\operatorname{right}}$I have the following recurrence with cases: $ p(l, r, s) = 0.5 \cdot \left(l, r, s) + 0.5 \cdot \right(l, r, s) $ where: $ \left(l, r, s) = \begin{cases} p(l - s, r, 2s) & s \le l\\ 1 & l < s \le l + w\\ 0 & l + w < s\end{cases} $

$ \right(l, r, s) = \begin{cases} p(l, r - s, 2 s) & s \le r\\ 1 & r < s \le r + w\\ 0 & r + w < s\end{cases}$

Is there a way to solve this recurrence analytically?

I'm interested in finding a solution for parameters such that $l = r = k$, $s = 1$ and $w = f\cdot k$, where $f \in (0, 1)$.

If not, is there a way to solve this analytically for a fixed $k$?

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    Please use `$...$` for mathematical text.2012-12-10

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