Source: wikibot/schwinger-s-quantum-action-principle
= Schwinger's quantum action principle
{wiki=Schwinger's_quantum_action_principle}
Schwinger's quantum action principle is a foundational concept in the field of quantum mechanics and quantum field theory, formulated by the physicist Julian Schwinger. The principle provides a powerful framework for deriving the equations of motion for quantum systems and relates classical action principles to their quantum counterparts.