I’ve seen it around places, and I don’t know what it means. Enlighten me, please. (And isn’t there a Doper named QED?)
Use a dictionary - Quod Erat Demonstrandum
QED. And yes, QED is a Doper.
In English ‘As So, It is proved …’
Schoolboys say it is for ‘Quite Easily Done.’
What about Quantum Electrodynamics?
Recent Thread on this:
http://boards.straightdope.com/sdmb/showthread.php?t=321566&highlight=Quod+Erat+Demonstrandum
It is also the name of a short-lived T.V. Show, and the initials of the main character, Quentin E. Deverill.
Loved that show.