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Stands for Quantum Explosion Dynamo, the last level of and the trigger mechanism for the Omegamatic, the Galaxy blower-upper that was to be used by the Shikadi, who were under the control of the Gannalech, to destroy the Milky Way in the 5th installment of id Software's Commander Keen series: The Armageddon Machine.

"Now entering Quantum Explosion Dynamo"

Gamer 1: "You coming to the LAN party?"

Gamer 2: "Of course, just let me lead these mines to the Q.E.D."

Gamer 1: "You coming to the LAN party?"

Gamer 2: "Of course, just let me lead these mines to the Q.E.D."

by Thox Ren-dar
April 30, 2008

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A Mathmeticians way of saying "I win"

Mathmetician: Q.E.D., Fuckface.

by Really Bored
July 02, 2005

2

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

QED

"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

QED

by redwind64
February 17, 2005

3

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

4

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!"

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

5

Abbr. of quod erat demonstrandum, lit. "which was demonstrated";

cf. res ipse loquitur (the thing speaks for itself), circumstantial evidence, the "smoking gun"

cf. res ipse loquitur (the thing speaks for itself), circumstantial evidence, the "smoking gun"

by latlit
July 21, 2003

6

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.

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.

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 the Atheist Alphageek
April 30, 2008

7

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