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|Look up Q.E.D. or QED in Wiktionary, the free dictionary.|
QED may refer to:
- Quantum electrodynamics, a field of physics
- Q.E.D., from the Latin quod erat demonstrandum, used at the end of a mathematical proof
- QED: Question. Explore. Discover, a two-day sceptical science festival in Manchester.
- QED: The Strange Theory of Light and Matter, a 1985 physics book by Richard Feynman
- QED (text editor), a 1960s line-oriented editor
- QED project and manifesto, a database of mathematical knowledge
- Quantum Effect Devices, a microprocessor design company
- Q.E.D. (U.S. TV series), a 1982 adventure series
- Q.E.D. (BBC TV series), a British science series
- Q.E.D. (manga), a 1997 detective manga series by Motohiro Katou
- QED (play), a 2001 play by Peter Parnell about Richard Feynman
- QED (band), a 1980s Australian New Wave band including Jenny Morris
- Q.E.D. (album), a 1993 album by Terje Rypdal
- QED Records, temporary name of Emanem Records
- Quantum Entanglement Device, a prop used in the television show FlashForward
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