---
tag: ET9J6R9T5C
kind: concept
name: Quod erat demonstrandum (QED)
sources:
  - wikipedia: en:76765067@r1368301704
    locator: Glossary of logic, section Q
    note: adopted
    mention: wikipedia://en/76765067#161N
    sections: [Summary]
inventory: [12PB8WVBA2]
---

## Summary

A Latin phrase meaning "which was to be demonstrated", traditionally used at the end of a mathematical proof or logical argument to signify its completion.