It's an abbreviation of quod erat demonstrandum, which is the Latin translation of a Greek phrase meaning "which had to be proven". To the ancient Greeks, a proof wasn't complete unless the last sentence in your proof was basically the statement of the theorem. Putting QED after that sentence was their way of saying, "and that's what I was trying to prove, so there, I've proved it". We aren't ...
QED is short for the Latin phrase quod erat demonstrandum and means, loosely, "that which was to be shown". As noted in the comments, it's a summary way of saying that the proof is concluded.
Eldorado Stone announces Rivenwood, a new panelized stone veneer profile with wood grain characteristics. Inspired by the pioneering craftsmanship seen in 19th century barns, Rivenwood is designed ...
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