A question about Feynman's book of Path. integrals

aife
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Page 35 Feynman Quantum Mechanics and Path Integrals
(2-26)ψ=(iε)R

I know it's a defination.But how to find some threads.How can we get this?
 
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Hello aife, maybe you have to give some more information about the matter, otherwise those who don't have the book won't be able to help you.Sergio
 
Thanks for your advice.
Here's the quote:
 

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