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Certainly an abbreviation of quod erat demonstrandum but after watching, suffering through, proving thousands of proofs, a math major might just say Quite Easily Done.

The final line of many proofs of the Pythagorean Theorem.

a squared + b squared = c squared

by MoHare April 30, 2008
37 87
A Mathmeticians way of saying "I win"
Mathmetician: Q.E.D., Fuckface.
by Really Bored July 02, 2005
3081 1175
An abbreviation of the Latin phrase "quod erat demonstrandum". It literally translates as "which was to be demonstrated", and is a formal way of ending a mathematical, logical or physical proof. It's purpose is to alert the reader that the immediately previous statement, which naturally was arrived at by an unbroken chain of logic, was the original statement that we were trying to prove.
"I refuse to prove that I exist," says God, "for proof denies faith, and without faith I am nothing."
"But," say Man, "the Babel fish is a dead giveaway, isn't it? It could not have evolved by chance. It proves you exist, and so therefore, by your own arguments, you don't. QED."
"Oh dear," says God, "I hadn't thought of that" and promply vanishes in a puff of logic." -- Douglas Adams, from "A Hitchiker's Guide to the Galaxy"

Proof that x + 3 = 0 if x = -3

x + 3 = (-3) + 3
= 0
by redwind64 February 17, 2005
1389 227
Originally Latin meaning "quod erat demonstrandum" or "which was to be shown or proven", now used mainly by physics students to insult someone when something is proven wrong or false, typically with the words Mother Fucker added for effect.
Ha! Your wrong.. QED mother fucker!
by ChickensBitch October 27, 2003
1441 559
1) From the Latin 'quod erat demonstrandum', a mathematical term meaning that a proof is complete.

2) A mathematician's way of saying "OH SNAP BITCH!"
"So you see, by this simple proof, your theory is wrong and mine is correct. QED!"
by loudlylikethemouse January 30, 2005
733 212
Abbr. of quod erat demonstrandum, lit. "which was demonstrated";
cf. res ipse loquitur (the thing speaks for itself), circumstantial evidence, the "smoking gun"
by latlit July 21, 2003
561 233
1. Abbreviation of the Latin phrase "quod erat demonstrandum; literally, "that which was to be demonstrated". Commonly used at the end of mathematical proofs to signify the proof is complete.

2. Modern usage expands it to include the conclusion of any proof and is often used in attempts at ironic humor.

3. Quantum electrodynamics.
1. If A=B and B=C then A=C. Q.E.D.

2. Beckham and Ronaldo move to MLS. MLS attracts more fans and makes more money. More money attracts more quality players. More quality players make USA competitive. USA wins World Cup. Q.E.D.

by Alan Bombria April 30, 2008
385 105
Formally used at the end of mathematical proofs to indicate their completion, informally to indicate an argument has been won. Literally "Which was to be demonstrated" (not just "which was demonstrated").
... Yeah well, I checked; they don't make dildos that big. Q.E.D.
by CletusInteruptus April 30, 2008
168 79