Even solutions to bound states in an odd number of $\delta$ potential wells | Ulysses’ trip

[UlyssesZh]

https://ulysseszh.github.io/physics/2023/02/02/odd-wells.html?

We try solving the even function solutions to the time-independent Schrödinger equation for the potential $V=-\alpha\sum_{j=-n}^n\delta(x-ja)$ such that $E<0$ (bound states).