# modus tollens

> if X implies Y, and Y isn't true, then neither is X

**Wikidata**: [Q844118](https://www.wikidata.org/wiki/Q844118)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Modus_tollens)  
**Source**: https://4ort.xyz/entity/modus-tollens


## References

1. Freebase Data Dumps. 2013