On shell and off shell
label: 在壳和离壳 @zh
description: configurations of a system that do or do not satisfy classical equations of motion
label: オンシェルとオフシェル @ja
subject: Category:Quantum field theory
description: configuracions d'un sistema que compleixen o no les equacions clàssiques del moviment @ca
label: Soluzione on shell e off shell @it
label: Powłoka masy @pl
label: On shell y off shell @es
label: 질량껍질 @ko