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Why they say QM is a pillar of QFT?Is it correct it is because of the operator of field obeys the Dirac or Klein-Gordon equation of QM?Is the value of fields(not operator of fields) being the wave function in QM?I do not understand why we can consider QFT including QM.

Thank you very much for your kind helping.

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# Why saying Quantum Mechanics is pillar of QFT?

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