Oh, oops. I was reading their statement: This interpretation is incorrect without the additional hypothesis that V (x) is a one-to-one function. as - all of th

Oh, oops. I was reading their statement: This interpretation is incorrect without the additional hypothesis that V (x) is a one-to-one function. as - all of the phi functions must be one-to-one. Looks like they made the same assumption that I would have. This was bothering me though so thanks for your response.