---
tag: HHPWDJ6PVY
kind: concept
name: Non-wellfounded mereology
sources:
  - wikipedia: en:36202984@r1336058118
    locator: Non-wellfounded mereology
    note: adopted
    mention: wikipedia://en/36202984
    sections: [Summary]
same_as:
  wikidata: Q7049084
  wikipedia: Non-wellfounded mereology
inventory: [2TSR64AJ01]
---

## Summary

In philosophy, specifically metaphysics, mereology is the study of parthood relationships. In mathematics and formal logic, wellfoundedness prohibits $\cdots<x<\cdots<x<\cdots$ for any *x*.