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    A question about Feynman's book of Path. integrals

    Thanks for your advice. Here's the quote:
  2. A

    A question about Feynman's book of Path. integrals

    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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