Search found 34 matches

by Logodaedalus
Fri Nov 14, 2008 6:17 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0504: "Legal Hacks"
Replies: 186
Views: 36196

Re: "Legal Hacks" Discussion

Rights are granted (inalienably, I might add :D ) by the creator. This raises some really interesting questions -- it is really important for a democratic society like ours that we attach a fundamental status to individual rights: there's no real way to derive them, so we have to take them as axiom...
by Logodaedalus
Tue Nov 04, 2008 5:47 am UTC
Forum: Mathematics
Topic: Obfuscating Schmoopiness With Math
Replies: 10
Views: 1784

Re: Obfuscating Schmoopiness With Math

The question is ambiguous.. is it [the velocity at time t] = Qln(-1)/i or is it the velocity at time [t=Qln(-1)/i] Yeah, it was supposed to be the first one, as you figured out. Sorry for the ambiguity. The problem is cute. Having a girlfriend that can actually solve the problem is hot. Unfortunate...
by Logodaedalus
Mon Nov 03, 2008 6:01 pm UTC
Forum: Mathematics
Topic: Obfuscating Schmoopiness With Math
Replies: 10
Views: 1784

Obfuscating Schmoopiness With Math

A man sent the following message to his girlfriend:

"The position of an object X in one dimension at time t is given by U*ln(t).

Solve the following for U:

The velocity of X at time t = Q*ln(-1)/i"

Hint:
Spoiler:
The solution requires a perhaps questionable application of Euler's identity.
by Logodaedalus
Fri Sep 05, 2008 4:09 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0472: "House of Pancakes"
Replies: 185
Views: 43486

Re: "House of Pancakes" Discussion

House of Leaves! I didn't know that was a widely enough known book to reference without comment in a webcomic... Edit: Oh. In my haste to show how cool I was by recognizing the reference, I missed the (extra) alt-text. Edit Edit: Wait a minute.... It wasn't really there, was it? Extra title text cou...
by Logodaedalus
Wed Jun 11, 2008 5:24 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0435: "Purity"
Replies: 649
Views: 199463

Re: "Purity" Discussion

I suppose I have to jump on the relationship of psychology to biology -- well, cognitive science to neuroscience, anyway. I, for one, consider all those people who study the brain to just be looking at one physical implementation of the pure informational system that I study as a cognitive scientist...
by Logodaedalus
Wed Mar 05, 2008 7:21 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0392: "Making Rules"
Replies: 157
Views: 27535

Re: Making Rules

Woohoo New Haven pizza!

That is all.

Except that "slug bug" is clearly a ridiculous name. "Punch buggy [color]" is obviously correct.
by Logodaedalus
Mon Feb 25, 2008 5:22 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0388: "Fuck Grapefruit"
Replies: 412
Views: 99598

Re: "Fuck Grapefruit" Discussion

Interesting how the first principal component of fruit seems to have such a positive slope... You'd think you'd mostly trade off between tastiness and difficulty (since all these things are eaten, they would, you might suppose, each have something going for them), but according to Randall, not so mu...
by Logodaedalus
Thu Dec 13, 2007 12:39 am UTC
Forum: Mathematics
Topic: Question about statistical hypothesis test
Replies: 20
Views: 1770

Re: Question about statistical hypothesis test

I have to say I'm with Cosmologicon here. I don't think this problem says anything about Bayesian vs. Frequentist statistics -- I think it just highlights the fact that the information you use to arrive at a conclusion affects your conclusion. Furthermore, I'm inclined to say that the knowledge abou...
by Logodaedalus
Fri Dec 07, 2007 7:06 am UTC
Forum: XKCD Meetups
Topic: Southern Arizona?
Replies: 45
Views: 11032

Re: Southern Arizona?

Nothing boring about that, I don't imagine...

Well pleased to make your virtual acquaintance.
by Logodaedalus
Thu Dec 06, 2007 5:22 pm UTC
Forum: Mathematics
Topic: Expectation of the variance of a conditional distribution
Replies: 5
Views: 2446

Re: Expectation of the variance of a conditional distribution

Yeah... I realized I'd misread the parens shortly after posting last night... Curses.
by Logodaedalus
Thu Dec 06, 2007 7:02 am UTC
Forum: Mathematics
Topic: Expectation of the variance of a conditional distribution
Replies: 5
Views: 2446

Re: Expectation of the variance of a conditional distribution

Actually, taking:

E((Y-E(Y|X))E(Y|X)) = 0

and distributing first expectation gives:

(E(Y) - E(E(Y|X)))E(Y|X) = 0

Since E(E(Y|X)) = E(Y), we get

(E(Y) - E(Y))E(Y|X) = 0, which is true. Voila.

Thanks again for that key correction...
by Logodaedalus
Thu Dec 06, 2007 6:43 am UTC
Forum: Mathematics
Topic: Expectation of the variance of a conditional distribution
Replies: 5
Views: 2446

Re: Expectation of the variance of a conditional distribution

Oh, right... I was treating Y|X as a random variable unto itself, but of course that doesn't make sense.

Thanks a lot. Makes sense now.
by Logodaedalus
Thu Dec 06, 2007 3:17 am UTC
Forum: XKCD Meetups
Topic: Southern Arizona?
Replies: 45
Views: 11032

Re: Southern Arizona?

Hey, I'm in Tucson... I'm in the Psych department at UA. You?
by Logodaedalus
Thu Dec 06, 2007 3:04 am UTC
Forum: Mathematics
Topic: Expectation of the variance of a conditional distribution
Replies: 5
Views: 2446

Expectation of the variance of a conditional distribution

Okay, so this is the last bit of a homework problem of which I've finished the rest. I've been scratching things out for a while now and seem to be going in circles. I don't want a full solution, but a hint about what to try would be useful. It really ought to be quite an easy problem... I just seem...
by Logodaedalus
Wed Nov 21, 2007 6:15 am UTC
Forum: Mathematics
Topic: mathy gift ideas for my n3rdl0ve? please help! :)
Replies: 20
Views: 2728

Re: mathy gift ideas for my n3rdl0ve? please help! :)

Indon wrote:If you can find a Rhythmomachia game set, you'd probably be good to go.

But I, sadly, don't know where to get one.


I co-wrote an AI agent to play Rhythmomachy at Governor's School in High School... I don't think I've heard the game mentioned since (nor had I before). Leave it to xkcd readers!
by Logodaedalus
Wed Nov 14, 2007 7:39 am UTC
Forum: Language/Linguistics
Topic: Verb form of "Placebo."
Replies: 29
Views: 6876

Re: Verb form of "Placebo."

Though come to think of it, it seems to me you should reverse the positions of "medical science" and "their hokey beliefs" in that sentence, as you would if you substituted "substitute" for "placebate", unless I'm not getting the intended meaning...
by Logodaedalus
Wed Nov 14, 2007 7:36 am UTC
Forum: Language/Linguistics
Topic: Verb form of "Placebo."
Replies: 29
Views: 6876

Re: Verb form of "Placebo."

Ah, now that's a bit different. You want the word to take as its object the placebo, rather than the recipient of the placebo, if I understand your sentence correctly... So it seems we could have all three of "placebify", "placebize" and "placebate" meaning, respectivel...
by Logodaedalus
Tue Nov 13, 2007 12:31 am UTC
Forum: Language/Linguistics
Topic: Verb form of "Placebo."
Replies: 29
Views: 6876

Re: Verb form of "Placebo."

On second thought, "placebify" might describe rendering something a placebo, rather than administering a placebo. So... how about "placebize"?
by Logodaedalus
Mon Nov 12, 2007 11:45 pm UTC
Forum: Language/Linguistics
Topic: Verb form of "Placebo."
Replies: 29
Views: 6876

Re: Verb form of "Placebo."

It seems clear that the correct form is "placebify"...
by Logodaedalus
Mon Nov 12, 2007 7:46 pm UTC
Forum: Mathematics
Topic: 2^x = x^3
Replies: 12
Views: 3263

Re: 2^x = x^3

It may not be particularly useful, but you can confirm for yourself that there are two real solutions by graphing the two sides of the equation, either the original one or x = 3log 2 (x). I find the latter easier to see... The logarithmic is obviously negative for x < 1, so it's below the linear, bu...
by Logodaedalus
Fri Sep 07, 2007 5:24 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0313: "Insomnia"
Replies: 167
Views: 38952

I was totally trying to figure out what was special about 13:72. Random choice of impossible time, as far as I can tell. 1372 = 7^3 * 2^2, he calculated compulsively... Incidentally, 431 and 433 are both prime, whereas 432 = 2^4 * 3^3. For what that's worth. Which isn't much, if anything. Interestin...
by Logodaedalus
Fri Aug 31, 2007 5:56 am UTC
Forum: Logic Puzzles
Topic: A New Monty Hall Version
Replies: 27
Views: 10830

So for high p, what do you do when/if you run out of doors you haven't been to before? Here's my reasoning: You should visit the door for which it has been the greatest number of turns since you've been there. The reason is that the relative advantage of a "vulnerable" door over the door y...
by Logodaedalus
Thu Aug 30, 2007 10:50 pm UTC
Forum: Logic Puzzles
Topic: A New Monty Hall Version
Replies: 27
Views: 10830

Sorry, I guess I should have said two doors, which is the situation you're in at the end of the traditional Monty Hall. I meant for it to approach the original game in the limit. In the p=0 case I don't think it matters much what you do, until the end, when you get to the original Monty Hall, at whi...
by Logodaedalus
Thu Aug 30, 2007 8:26 pm UTC
Forum: Logic Puzzles
Topic: Word Puzzle Collection (Rebus'?)
Replies: 40
Views: 8968

I maintain that my answer to K is even better, as it is one extra step removed from the surface of the problem, and forms an integrated whole. :D
by Logodaedalus
Thu Aug 30, 2007 8:15 pm UTC
Forum: Logic Puzzles
Topic: Word Puzzle Collection (Rebus'?)
Replies: 40
Views: 8968

K) "Cheese Omelette"(?)
L) "Paradox"
M) "Look both ways before you cross"


EDIT: Added a stab at K
by Logodaedalus
Thu Aug 30, 2007 8:12 pm UTC
Forum: Logic Puzzles
Topic: A New Monty Hall Version
Replies: 27
Views: 10830

A New Monty Hall Version

I know, I know, it's taboo to post variations on the Monty Hall problem, but I searched, and this one hasn't been posed. I don't even know if it's posed anywhere, since I made it up. Which isn't to say someone else hasn't independently made it up, but. I think it's interesting. Okay. You're faced wi...
by Logodaedalus
Thu Aug 30, 2007 7:45 pm UTC
Forum: Logic Puzzles
Topic: Word Puzzle Collection (Rebus'?)
Replies: 40
Views: 8968

I guess I'm naughty for posting solutions here without starting a new solution thread... Oops.
by Logodaedalus
Thu Aug 30, 2007 7:34 pm UTC
Forum: Logic Puzzles
Topic: Word Puzzle Collection (Rebus'?)
Replies: 40
Views: 8968

I'll get some of the easier ones out of the way, and keep thinking about the rest... B) "Back in Time" C) "Three Blind Mice" D) "What goes up must come down" E) "H2O" F) "Safety in Numbers" H) Letterbox(?) I) "Flying blind" EDIT: Added F af...
by Logodaedalus
Thu Aug 30, 2007 5:08 pm UTC
Forum: Logic Puzzles
Topic: Seemingly (and hopefully) very basic logic question
Replies: 22
Views: 4824

It seems to me that what we should start out with is: 1) (~G & P) => ~A Which is equivalent to ~G => (P=>~A) Obviously (P=>~A) /= ~(P=>A)... While ~(P=>A) allows only for (P & ~A), (P => ~A) allows for that, as well as ~P, which seems like what we want. Sorry if this has been said already el...
by Logodaedalus
Tue Aug 28, 2007 5:14 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0163: "Donald Knuth"
Replies: 36
Views: 22507

-What do you get when you cross an insomniac, an agnostic and someone with ADD?
by Logodaedalus
Tue Aug 28, 2007 5:11 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0163: "Donald Knuth"
Replies: 36
Views: 22507

-What do you get when you cross an insomniac and an amnesic?

-Someone who stays up all night trying to remember the punchline
by Logodaedalus
Fri Aug 24, 2007 4:19 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0307: "Excessive Quotation"
Replies: 80
Views: 26425

Chipersoft wrote:
LordIllidan wrote:I bet half of them still find the concept of a dice with more than 6 sides odd.

No more odd then your use of "dice" in the singular.


No more odd than your use of "then" to mean "than"...

Oh, snup!
by Logodaedalus
Fri Aug 17, 2007 9:03 pm UTC
Forum: Mathematics
Topic: The Derivative Song
Replies: 23
Views: 4693

This song is well and good, but the sequel is really an indispensable part of the musical canon...

*cricket*...*cricket*
by Logodaedalus
Fri Aug 17, 2007 2:44 am UTC
Forum: Logic Puzzles
Topic: another Monty Hall variant [solution]
Replies: 9
Views: 3959

To dredge up an old thread... Everyone is in agreement that there is an expected 2/9 of a car from the scenario where the first round is the altered version and we have chosen a goat. Now let's say the host opens a door. We agree, too, that in this scenario, it doesn't matter whether we stay or swit...

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