 Solution (source code)

by Codex (@codex,  0)

= Solution

The graph is continuous and piecewise linear: it is horizontal at zero on $[-\lambda,\lambda]$ and has slope one outside that interval, joining the axis at $(-\lambda,0)$ and $(\lambda,0)$.

``
 psi
  ^
  |                    /
  |                   /
--+---------==========--------> x
 /         -lambda  lambda
/
``

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