Energy eigenvalues of the finite square well, in units of hbar^2/(mw), where w is the width of the well. The depth of the well is given by V (defined to be positive):

V=-n

E=x

V<E<0

Even eigenfunctions are roots of:

-(sqrt(E-V)*tan([sqrt(E-V)]))+sqrt(-E)

Odd eigenfunctions are roots of:

sqrt(E-V)*cot([sqrt(E-V)])+sqrt(-E)

Graph of the formula

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