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This isn't a HW problem, it's more of a general question. I'm reading Griffith's Intro to QM 3rd Edition. On page 134 he uses separation of variables, of which I'm familiar (but by no means an expert). Could someone explain why the separation constant in equations 4.16 and 4.17 changes sign?

The equations in question : http://imgur.com/8OKqz" [Broken]

The equations in question : http://imgur.com/8OKqz" [Broken]

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