How do you end your proofs? QED, box, ...
Moderators: gmalivuk, Moderators General, Prelates
How do you end your proofs? QED, box, ...
In the vein of W^5 (or WWWWW = "Which Was What We Wanted") I'm trying to get "BB" popularized.
BB for "Badabing"
Seriously, next time you're telling somebody a proof, when you get to the end, just say "badabing" .. it fits so well.
BB for "Badabing"
Seriously, next time you're telling somebody a proof, when you get to the end, just say "badabing" .. it fits so well.
http://www.cdbaby.com/cd/mudge < buy my CD (Now back in stock!)
 LoopQuantumGravity
 Posts: 416
 Joined: Mon Oct 01, 2007 4:19 am UTC
Re: How do you end your proofs? QED, box, ...
mudge wrote:In the vein of W^5 (or WWWWW = "Which Was What We Wanted") I'm trying to get "BB" popularized.
BB for "Badabing"
Seriously, next time you're telling somebody a proof, when you get to the end, just say "badabing" .. it fits so well.
THE END
I also like to start proofs with "BEHOLD!"
I study theoretical physics & strings, and am a recipient of the prestigious Jayne Cobb Hero of Canton award.
And the science gets done and you make a neat gun
For the people who are still alive!
And the science gets done and you make a neat gun
For the people who are still alive!
Re: How do you end your proofs? QED, box, ...
LoopQuantumGravity wrote:mudge wrote:In the vein of W^5 (or WWWWW = "Which Was What We Wanted") I'm trying to get "BB" popularized.
BB for "Badabing"
Seriously, next time you're telling somebody a proof, when you get to the end, just say "badabing" .. it fits so well.
THE END
I also like to start proofs with "BEHOLD!"
haha, nice.
For the really avant garde proofs, do you end with FIN?
http://www.cdbaby.com/cd/mudge < buy my CD (Now back in stock!)
Re: How do you end your proofs? QED, box, ...
Quite surprised that QED is so unpopular (so far).
This is a placeholder until I think of something more creative to put here.
 Gelsamel
 Lame and emo
 Posts: 8237
 Joined: Thu Oct 05, 2006 10:49 am UTC
 Location: Melbourne, Victoria, Australia
Re: How do you end your proofs? QED, box, ...
QED is by far the coolest.
"Give up here?"
 > No
"Do you accept defeat?"
 > No
"Do you think games are silly little things?"
 > No
"Is it all pointless?"
 > No
"Do you admit there is no meaning to this world?"
 > No
 > No
"Do you accept defeat?"
 > No
"Do you think games are silly little things?"
 > No
"Is it all pointless?"
 > No
"Do you admit there is no meaning to this world?"
 > No
Re: How do you end your proofs? QED, box, ...
"Ok, tea time!"
(Mathematics is thirsty work.)
(Mathematics is thirsty work.)
Avatar yoinked from Inverloch.
"Unless ... unless they kill us, then animate our corpses as dead zombies to fight for them. Then I suppose they've taken our lives, AND our freedom."
 Elan, OOTS 421.
"Unless ... unless they kill us, then animate our corpses as dead zombies to fight for them. Then I suppose they've taken our lives, AND our freedom."
 Elan, OOTS 421.
 Mathmagic
 It's not as cool as that Criss Angel stuff.
 Posts: 2926
 Joined: Thu Nov 30, 2006 12:48 am UTC
 Location: In ur fora posting in teh threads
Re: How do you end your proofs? QED, box, ...
Gelsamel wrote:QED is by far the coolest.
Word.
What's even better is when you use QEF, and people are like WTF?.
Axman: That, and have you played DX 10 games? It's like having your corneas swabbed with clits made out of morphine.
Pathway: cocks cocks cocks
Pathway: cocks cocks cocks
Re: How do you end your proofs? QED, box, ...
For me, it depends on the complexity of the proof. QED has an audacious ring to it, and is constricted to 'surprising' proofs, i.e. proofs which depend on a property that is seemingly unrelated to the claim; and, I'd guess, new proofs, but I haven't written any of them.
For simple, straightforward proofs, an open box suffices.
For simple, straightforward proofs, an open box suffices.
Re: How do you end your proofs? QED, box, ...
I use QED.
Edit: I also like to preface that with voilá if the proof involved a surprising step, especially to finish.
So if it's something that is nonobvious until the very end, follow the key point with "And voilá!, [last few lines]. QED"
Edit: I also like to preface that with voilá if the proof involved a surprising step, especially to finish.
So if it's something that is nonobvious until the very end, follow the key point with "And voilá!, [last few lines]. QED"
Last edited by xyzzy on Mon Oct 29, 2007 6:01 pm UTC, edited 1 time in total.
"Wile E. Coyote was a theoretical mathematician."  Leliel
"Modern life can be so boring without elements of the bizarre or the fantastical. Hence, we have steampunk."  Me
"Modern life can be so boring without elements of the bizarre or the fantastical. Hence, we have steampunk."  Me

 Should have Boobs (In theory)
 Posts: 1483
 Joined: Tue Sep 12, 2006 4:23 pm UTC
Re: How do you end your proofs? QED, box, ...
For someone who will happily admit that I struggle at maths and often have to work up a good brain sweat before reaching the end of a problem , QED is the sweet relief and the knowledge of a job well done.
It is a mistake to think you can solve any major problems just with potatoes  Douglas Adams
 Marbas
 Posts: 1169
 Joined: Mon Jun 04, 2007 4:01 am UTC
 Location: Down down down at the bottom of the sea
 Contact:
Re: How do you end your proofs? QED, box, ...
TYFC
There's your fucking cookie.
Actually...I just use a box, or random scribble.
There's your fucking cookie.
Actually...I just use a box, or random scribble.
Jahoclave wrote:Do you have any idea how much more fun the holocaust is with "Git er Done" as the catch phrase?
 Hexadecimator
 Posts: 177
 Joined: Thu Jul 26, 2007 10:48 pm UTC
 Location: WA, USA, Earth, ZZ9 Plural Z Alpha
Re: How do you end your proofs? QED, box, ...
Normally just a box, but if it's something difficult or something amazingly cool (eg. seemingly unrelated stuff with a awesome surprise twist at the end) QED is the perfect way to end it with a bang. QED, bitches.
"In the beginning, the universe was created. This made a lot of people very angry and was widely regarded as a bad move." Douglas Adams
Re: How do you end your proofs? QED, box, ...
I light the proof on fire when it's finished.
Or I use a clockstamp for start and finish. Thank you very much LaTeX.
Or I use a clockstamp for start and finish. Thank you very much LaTeX.
"OMIT NEEDLESS WORDS"
William Strunk, Jr.
William Strunk, Jr.
Re: How do you end your proofs? QED, box, ...
Usually, I don't really put anything. Sometimes a box. For the particularly special ones, I write "Proven With No Enduring Doubt".
Jerry Bona wrote:The Axiom of Choice is obviously true; the Well Ordering Principle is obviously false; and who can tell about Zorn's Lemma?
 madprocess
 Posts: 65
 Joined: Mon Sep 18, 2006 9:35 pm UTC
 Contact:
Re: How do you end your proofs? QED, box, ...
Granted I'm still an undergrad, so my proofs haven't been difficult or surprising. However, I put a diagonally hashed box at the end. If it's a iff problem, I'll put a half filled diagonally hashed box at the end of each ifthen statement and then state my conclusion and follow it with a hashed box.

 Posts: 8
 Joined: Fri Sep 07, 2007 4:15 pm UTC
Re: How do you end your proofs? QED, box, ...
I mostly use boxes. Simple, boring boxes. They always seemed to yell "and if you consider _this_ proof completely random and weird, wait until I you see the one where I left out the few remaining english words as well!". Payback time.
 Torn Apart By Dingos
 Posts: 817
 Joined: Thu Aug 03, 2006 2:27 am UTC
Re: How do you end your proofs? QED, box, ...
Open boxes ftw! I'm surprised QED is so popular. It's not common in books.
Re: How do you end your proofs? QED, box, ...
I usually just do a filled in box, but I used to write "TaDa", then it morphed into a tada symbol, which quickly became a TIE Fighter. Please draw Star Wars ships at the end of proofs, it makes professors happy.
Re: How do you end your proofs? QED, box, ...
QED...
In huge letters scrawled over the proof itself... with a black marker.
In huge letters scrawled over the proof itself... with a black marker.
Got a lovebite from a wasp
Sexy little hexapod ^{*}
Sexy little hexapod ^{*}
Re: How do you end your proofs? QED, box, ...
Although I do like using QED, I actually use an empty box more often. That way I can draw in a smiley face inside it if I get bored. Um, pixel in a smiley face. Hmm I don't think that helped much.
So I can pixel in TIE Fighters!
So I can pixel in TIE Fighters!
LOWA
 Arancaytar
 Posts: 1642
 Joined: Thu Mar 15, 2007 12:54 am UTC
 Location: 52.44°N, 13.55°E
 Contact:
Re: How do you end your proofs? QED, box, ...
qed
All lowercase. Although "tea time" and "badabing" are both interesting options, and I'll just have to try "Behold!" some time.
You win.
All lowercase. Although "tea time" and "badabing" are both interesting options, and I'll just have to try "Behold!" some time.
For the particularly special ones, I write "Proven With No Enduring Doubt"
You win.
"You cannot dualwield the sharks. One is enough." Our DM.
 crazyjimbo
 Posts: 887
 Joined: Fri Apr 20, 2007 11:45 pm UTC
 Location: Durham, England
 Contact:
Re: How do you end your proofs? QED, box, ...
I like the box for it's simplicity, yet it oozes loads of raw prooving power. When you put that box, it MEANS something, and that 'spretty powerful for a little box. Perhaps too much for it to handle.
But, there is nothing quite like scrawling QED over half the page when you finally crack a proof that's had you crying, screaming, and suffering for 3 days straight.
But, there is nothing quite like scrawling QED over half the page when you finally crack a proof that's had you crying, screaming, and suffering for 3 days straight.
 LoopQuantumGravity
 Posts: 416
 Joined: Mon Oct 01, 2007 4:19 am UTC
Re: How do you end your proofs? QED, box, ...
of.hippo wrote:I usually just do a filled in box, but I used to write "TaDa", then it morphed into a tada symbol, which quickly became a TIE Fighter. Please draw Star Wars ships at the end of proofs, it makes professors happy.
I do occasionally call a capital phi "capital tie fighter."
I study theoretical physics & strings, and am a recipient of the prestigious Jayne Cobb Hero of Canton award.
And the science gets done and you make a neat gun
For the people who are still alive!
And the science gets done and you make a neat gun
For the people who are still alive!
Re: How do you end your proofs? QED, box, ...
QED unless it was a proof by contradiction which gets an "RAA!!!!" for reductio ad absurdum.
 b.i.o
 Green is the loneliest number
 Posts: 2519
 Joined: Fri Jul 27, 2007 4:38 pm UTC
 Location: Hong Kong
Re: How do you end your proofs? QED, box, ...
Sometimes a box. For the particularly special ones, I write "Proven With No Enduring Doubt".
I'm definitely doing that next time I have to prove something.
 Arancaytar
 Posts: 1642
 Joined: Thu Mar 15, 2007 12:54 am UTC
 Location: 52.44°N, 13.55°E
 Contact:
Re: How do you end your proofs? QED, box, ...
[quote]have to prove something[/url]
...or something to prove.
...or something to prove.
"You cannot dualwield the sharks. One is enough." Our DM.
Re: How do you end your proofs? QED, box, ...
CQFD (it's French : "Ce qu'il fallait démontrer", roughly translated to "What was to be demonstrated" or whatever a better translation would be).
Re: How do you end your proofs? QED, box, ...
I'm a fan of QED in other arenas besides math, like finishing up a section of a debate with "QED, bitch."
Back in discrete math, though, I usually just finished up with a derivative of W^5 (something like "which is as stated"), and then a double slash in/beside the right margin. That's what the teacher used, so I just sort of adopted it, and then kept using it later.
Back in discrete math, though, I usually just finished up with a derivative of W^5 (something like "which is as stated"), and then a double slash in/beside the right margin. That's what the teacher used, so I just sort of adopted it, and then kept using it later.

 Posts: 230
 Joined: Wed Jun 27, 2007 10:09 am UTC
Re: How do you end your proofs? QED, box, ...
I am tagging this purely for future reference.
Re: How do you end your proofs? QED, box, ...
I like QED. It looks so proffessional.
Re: How do you end your proofs? QED, box, ...
I'd like to say I use something cool or inventive ("splaDOW!"), but I just typically use "QED" or sometimes nothing if it's obvious the proof is done.
"You seem a decent fellow  I hate to kill you."
"You seem a decent fellow  I hate to die."
"You seem a decent fellow  I hate to die."
Re: How do you end your proofs? QED, box, ...
Usually I don't write the proof at all. I just do the math completely out of order through my notebook, in the end it looks like a total mess.
When I'm serious about it though i use c.q.d. at the end of the proof. It's short for como queríamos demonstrar which is Portuguese for the same thing the frenchspeaking guy posted.
I'm looking foward to use "TaDa" or "Behold!" in my tests
When I'm serious about it though i use c.q.d. at the end of the proof. It's short for como queríamos demonstrar which is Portuguese for the same thing the frenchspeaking guy posted.
I'm looking foward to use "TaDa" or "Behold!" in my tests
Sorry for my bad grammar and my wrong ortography. I'm Brazilian, never left my country and I am too lazy to go to English classes. They bore me
Re: How do you end your proofs? QED, box, ...
A T.A. of mine suggested ending proofs with "OSB": "Oh snap, bitch."
I use a filledin box, rightjustified. In my notes, I make an empty box instead when the proof is omitted or informal.
I use a filledin box, rightjustified. In my notes, I make an empty box instead when the proof is omitted or informal.
Re: How do you end your proofs? QED, box, ...
I usually use the filledin box by default. When I'm in the mood, though, I use QED. Results that have a surprising twist at the end (i.e. going from something seemingly completely unrelated to the exact thing we want to prove in a line or two) usually get an exclamation point, sometimes a box as well. And when the result is nifty, I use a smiley face.
I also use the smiley face in lecture notes to stand in for "and the rest of the steps are obvious".
I also use the smiley face in lecture notes to stand in for "and the rest of the steps are obvious".

 Posts: 57
 Joined: Sat Nov 10, 2007 9:56 am UTC
 Contact:
Re: How do you end your proofs? QED, box, ...
"as desired"
I really hate QED. It seems overly pretentious. and also means quantum electrodynamics, so all the mathematical physicists get confused.
I really hate QED. It seems overly pretentious. and also means quantum electrodynamics, so all the mathematical physicists get confused.
Re: How do you end your proofs? QED, box, ...
My ACalc professor used a lightning bolt to conclude a proof by contradiction, which I thought was way better than the alternative of ><. When I saw that, though, I wished other proofs had a cool symbol, so I started using a really small tornado, complete with house and Todo for my other proofs. If I get a chance, I'll draw it up in GIMP later and attached it.
Also, my Algebra prof would use a box for proofs, and it would be filled in if all details were provided, something that looked like a mesh if it was mostly there but there were some things missing, and an empty box for a sketch.
Also, my Algebra prof would use a box for proofs, and it would be filled in if all details were provided, something that looked like a mesh if it was mostly there but there were some things missing, and an empty box for a sketch.
Re: How do you end your proofs? QED, box, ...
In an effort to become more pretentious I am adopting CQFD instead of QED.MysticTerminator wrote:I really hate QED. It seems overly pretentious.
Although having a thing for full sentences and clarity in my writing most of the time I end with "So [thing that I was proving] must hold."
Re: How do you end your proofs? QED, box, ...
I always thought the box was an ancient Latin pun based on Quod Erat sounding similar to the latin word/root for "square". I now know it isn't, but it made so much sense!
And still does. If the ancients thought of it, they'd use it for sure.
And still does. If the ancients thought of it, they'd use it for sure.
Slay the living! Raise the dead! Paint the sky in crimson red!
 Kawa
 Posts: 714
 Joined: Wed May 02, 2007 12:24 pm UTC
 Location: Melbourne, FL/New York City/xkcdia
 Contact:
Re: How do you end your proofs? QED, box, ...
What, "quod erat demonstratum" doesn't mean "Look, a filledin box"?! XD
I'm seriously tempted to go the lolcat route and go "kthxbai" after proofs (and starting proofs with "I can has <proof method here>," since my current class has instructions like "Prove this by induction" and "Prove this by contradiction".)
I'm seriously tempted to go the lolcat route and go "kthxbai" after proofs (and starting proofs with "I can has <proof method here>," since my current class has instructions like "Prove this by induction" and "Prove this by contradiction".)
Kawa likes these things:
Spanish Ninja Bodyguard
math, anime, more!
Origami, Florida
New York, and xkcd.
Spanish Ninja Bodyguard
math, anime, more!
Origami, Florida
New York, and xkcd.

 Posts: 230
 Joined: Wed Jun 27, 2007 10:09 am UTC
Re: How do you end your proofs? QED, box, ...
Kawa wrote:What, "quod erat demonstratum" doesn't mean "Look, a filledin box"?! XD
I'm seriously tempted to go the lolcat route and go "kthxbai" after proofs (and starting proofs with "I can has <proof method here>," since my current class has instructions like "Prove this by induction" and "Prove this by contradiction".)
This rocks.
I would also like to propose "TAFJ", for "That's A Fact, Jack!"
Who is online
Users browsing this forum: No registered users and 10 guests