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Starting with a general rational wave function, we search for potentials admitting it as a bound energy eigenfunction. We thus derive singular and regular potentials asymptotically decaying as the inverse of x squared, with the latter being simple or multiple volcanoes having a finite number of bound eigenstates. We present specific examples and ex...

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... (30) The polynomial ( ) 6 Q x % is plotted in Figure 4 and, as we see, it is everywhere positive, i.e. it has no zeros. 55 ...

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