Collection of Physical objectsPhysical System NotionConservation lawPhysical objectNoether's theoremActionNoether's second theoremNoether CurrentQuantum systemContracted Bianchi identitiesGeneral covarianceLocal SymmetryGlobal Symmetry Physical systemA physical system is a collection of physical objects under study. The collection differs from a set: all the objects must coexist and have some physical relationship. In other words, it is a portion of the physical universe chosen for analysis. Everything outside the system is known as the environment, which is ignored except for its effects on the system.https://en.wikipedia.org/wiki/Physical_system
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