I'm a beginner in QFT, starting out with D. J. Griffiths' book in this topic.(adsbygoogle = window.adsbygoogle || []).push({});

I have a question on the operators used in QM. What are operators? What is the physical significance of operators? I can understand that ##\frac {d}{dt}## to be an operator, but how can there be a total energy operator, a potential energy operator, and what is the meaning of subtracting them to give a Hamiltonian? (##\hat H = \hat T - \hat V##)

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# B What are operators?

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