Question re: Schrodinger's equation

SteveM19
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I hope this is the right place for this question. This layman has a question about Schrodigner's equation for a free particle, http://http://planetmath.org/encyclopedia/WaveFunction.html" -- just a smidge down the page, sorry I am not able to post an image of the equation -- I have a problem with the variable that looks to be delta over delta x t.

I am new to the technical aspects of classical and quantum physics, and am still getting up to speed. Thanks to all in advance for your help.
 
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1) I am unable to open the page cited.
2) It sounds like this question is more appropriate to the "Quantum Physics" thread than to mathematics.
 

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