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QED is a computer text editor.

Originally written by Butler Lampson and Peter Deutsch for the SDS 940 (in the 1960s?). Ken Thompson later wrote a version for CTSS; this version was notable for introducing regular expressions. QED influenced the classic UNIX text editor ed and the less well known sam.

History of QED


See also: Q.E.D.

QED is also a (sort of) widely used abbreviation of quantum electrodynamics