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19.
What someone writes when insecure about his abilities as a physicist or mathematician to make themselves feel smarter than they likely are. Typically used by douchebags who think they are doing something amazing by proving a problem from a textbook. Usually follows a terribly formed proof which lacks rigor or reasoning.
"x+y=2. Clearly, z=4, QED."

"You're obviously incorrect, as is seen without proof. QED"
by March 20, 2008
27 88

1.
A Mathmeticians way of saying "I win"
Mathmetician: Q.E.D., Fuckface.
by July 02, 2005
3077 1174

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
by February 17, 2005
1388 227

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 October 27, 2003
1440 559

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!"
"So you see, by this simple proof, your theory is wrong and mine is correct. QED!"
by January 30, 2005
733 212

5.
Abbr. of quod erat demonstrandum, lit. "which was demonstrated";
cf. res ipse loquitur (the thing speaks for itself), circumstantial evidence, the "smoking gun"
by July 21, 2003
561 233

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.
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 April 30, 2008
385 105

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 April 30, 2008
168 79