Qed

QED stands for:

• Quantum electrodynamics , a branch of quantum physics
• the QED text editor , which was programmed in 1967 by Butler Lampson and L Peter Deutsch and is the predecessor of ed , see also ed (text editor)
• Quadcap Embeddable Database , an open source database implemented in Java
• Quod Erat Demonstrandum eV, an association founded by young people, which supports the promotion of gifted students and holds mathematically oriented seminars, see State Mathematics Competition Bavaria # Quod Erat Demonstrandum e. V.
• a brand name of the former British automobile manufacturer Marshall-Arter

q. e. d. stands for:

• quod erat demonstrandum , Latin for: what was to be proven , completion of a demonstration in mathematics and philosophy

This is a disambiguation page for differentiating between several terms identified with the same word.