# selection rule

> formal constraint on the possible transitions of a system from one quantum state to another

**Wikidata**: [Q570412](https://www.wikidata.org/wiki/Q570412)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Selection_rule)  
**Source**: https://4ort.xyz/entity/selection-rule


## References

1. Freebase Data Dumps. 2013