# On shell and off shell

> configurations of a system that do or do not satisfy classical equations of motion

**Wikidata**: [Q1132926](https://www.wikidata.org/wiki/Q1132926)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/On_shell_and_off_shell)  
**Source**: https://4ort.xyz/entity/on-shell-and-off-shell


## References

1. Freebase Data Dumps. 2013