In chapter 9 "Quantum Mechanical Transformations", example 9.3, can anyone explain how $$\hat{p}$$ in the exponential converts itself to q? Apologies in advance if this is very basic, but thanks for looking.(adsbygoogle = window.adsbygoogle || []).push({});

$$\hat{u}(a)|q>=e^{-i\hat{p}\cdot a} |q> $$

$$\hat{u}(a)|q>=e^{-iq\cdot a} |q> $$

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# I QFT for the Gifted Amateur Question?

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