Search found 221 matches

by andrewxc
Mon Jun 23, 2014 2:45 pm UTC
Forum: Mathematics
Topic: What would be the all around "best" base to use?
Replies: 52
Views: 13959

Re: What would be the all around "best" base to use?

I like the dozenal system, as explained in Here's Looking at Euclid . Numbers are: zero, one, two, three, four, five, six, seven, eight, nine, dec, el, do, written: 0,1,2,3,4,5,6,7,8,9, X, E, 10. 'El' is usually a '3' that is rotated 180º (looks a bit like an epsilon), but HTML code has it as a capi...
by andrewxc
Mon Jun 23, 2014 2:34 pm UTC
Forum: Mathematics
Topic: What would be the all around "best" base to use?
Replies: 52
Views: 13959

Re: What would be the all around "best" base to use?

Everything is base 10... :twisted:
by andrewxc
Fri Jun 28, 2013 4:56 pm UTC
Forum: Mathematics
Topic: Exclusive or problems
Replies: 12
Views: 1710

Re: Exclusive or problems

Okay, after conferring with some colleagues, the best phrase to use would have been "disjoint set." I was looking for, essentially, (A only OR B only OR C only), which is the set of all elements in each set A, B, and C, disjoint from the others (sorry if my English is off on this one - I h...
by andrewxc
Thu Jun 27, 2013 3:35 pm UTC
Forum: Science
Topic: Global Warming to 11?
Replies: 32
Views: 7682

Re: Global Warming to 11?

Copper Bezel wrote:Plenty of other ways to reduce the world population in this thread that wouldn't be quite so counter-productively selective.

Birth-control in the water supply.
by andrewxc
Thu Jun 27, 2013 3:30 pm UTC
Forum: Science
Topic: Worst thing you've seen in a lab
Replies: 256
Views: 232697

Re: Worst thing you've seen in a lab

Hmmm. He might have lied to me and been on actual drugs, then. Wouldn't surprise me. @PM - Some idiots in our (high school) class decided a good senior class prank would be to get some butyric acid and splash a couple of eye-dropper-fulls around the school. Same result as your story, though to the (...
by andrewxc
Thu Jun 27, 2013 3:20 pm UTC
Forum: Mathematics
Topic: Exclusive or problems
Replies: 12
Views: 1710

Re: Exclusive or problems

I really hope this isn't the simplest way:
(a xor b xor c) and ~(a and b and c)
by andrewxc
Thu Jun 27, 2013 3:13 pm UTC
Forum: Mathematics
Topic: Exclusive or problems
Replies: 12
Views: 1710

Exclusive or problems

I have an interesting problem concerning set notation. I am trying to find the method to properly annotate "A xor B xor C" that does not include the intersection "A and B and C". Wolfram Alpha puts parentheses around two of the statements (take your pick, it doesn't change the re...
by andrewxc
Tue Jun 25, 2013 2:55 pm UTC
Forum: Science
Topic: Worst thing you've seen in a lab
Replies: 256
Views: 232697

Re: Worst thing you've seen in a lab

One of my high school chem teachers (not my class, though) made a 100-fold error in the amount of gas that would be produced from the reaction between a powder and acid. Ended up flooding the science wing with Chlorine gas. Not a dangerous concentration, just enough to irritate the lungs. Everyone h...
by andrewxc
Tue Jun 25, 2013 2:51 pm UTC
Forum: Science
Topic: Worst thing you've seen in a lab
Replies: 256
Views: 232697

Re: Worst thing you've seen in a lab

An accident, but still... A friend grazed his hand (below his first knuckle, above the fleshy part) on a titration setup with HCl in it (low- to mid-grade molarity, so not too dangerous). It started to sting his hand and he said "ow", and stuck the side of his hand in his mouth (like sucki...
by andrewxc
Tue Jun 25, 2013 2:35 pm UTC
Forum: Science
Topic: Global Warming to 11?
Replies: 32
Views: 7682

Re: Global Warming to 11?

Well, let's keep in mind that scientists would probably get out giant white tarpaulins to cover all of the dark areas of the world, in order to cancel out some of the effects. :lol:
by andrewxc
Tue Jun 25, 2013 2:11 pm UTC
Forum: Mathematics
Topic: Beal Conjecture
Replies: 4
Views: 2892

Re: Beal Conjecture

I've looked over the Unsolved Problems page. It seems like the answers are either half-baked, unintelligible nonsense or follow false premises: http://unsolvedproblems.org/S27G.pdf - Lost me at "Z^a = 1_a*1_a" http://unsolvedproblems.org/S14a.pdf - Assumed a, b, & c are co-prime, but o...
by andrewxc
Fri Jun 21, 2013 5:50 pm UTC
Forum: Mathematics
Topic: Beal Conjecture
Replies: 4
Views: 2892

Re: Beal Conjecture

It looks as though there aren't any proofs of any generalized Fermat Theora with these conditions. Even partial proofs, as far as I can see...
I find this odd. Then again, most journal articles are probably locked away for paying members only.
by andrewxc
Tue Jun 18, 2013 3:02 pm UTC
Forum: Mathematics
Topic: Beal Conjecture
Replies: 4
Views: 2892

Beal Conjecture

Well, looks like the crackpots are going to come out of the woodwork again, now that the prize has been increased by an order of magnitude. Me first... I have been able to prove a small piece of the Beal Conjecture and am working on a manuscript to send off. It's pretty weak, since it only covers &q...
by andrewxc
Fri Jun 07, 2013 5:28 pm UTC
Forum: Mathematics
Topic: Twin Prime Conjecture - A leap forward
Replies: 5
Views: 3047

Twin Prime Conjecture - A leap forward

I'm a bit surprised this hasn't been posted, yet. When I saw the title, I said, "oh, come on, fair play...", but I guess he is "unknown", coming from New Hampshire, and not having published widely circulated papers, which is too bad. http://www.telegraph.co.uk/science/science-new...
by andrewxc
Fri Jun 07, 2013 5:03 pm UTC
Forum: Mathematics
Topic: get to the current xkcd comic with next and random button
Replies: 26
Views: 6765

Re: get to the current xkcd comic with next and random butto

gmalivuk wrote:Yeah, "Random" is definitely the way to go if you're not even to the halfway point. The difficulty is figuring out exactly which comic past halfway is the optimal cutoff.

How much do you want to bet the answer has something to do with pi?
by andrewxc
Fri Jun 07, 2013 5:02 pm UTC
Forum: Mathematics
Topic: get to the current xkcd comic with next and random button
Replies: 26
Views: 6765

Re: get to the current xkcd comic with next and random butto

Clearly, you should get your hands on the seeding protocol and see where you are in the list and determine how many clicks it will take to get you to a "close" recent comic, but I guess that's cheating :twisted: . And we also assume that it's a good randomizer, not a computer that requires...
by andrewxc
Fri Jun 07, 2013 4:46 pm UTC
Forum: Mathematics
Topic: Neat Mental Arithmetic Tricks
Replies: 33
Views: 5572

Re: Neat Mental Arithmetic trickses

There's various trickses for divisibility beyond casting out 9s: If the last digit is divisible by 2, so is the number. If the last two digits are divisible by 4, so is the number. This can be extended for all powers of 2, though in practice it's probably only useful for 2, 4, maybe 8. If t...
by andrewxc
Fri Jun 07, 2013 4:24 pm UTC
Forum: Mathematics
Topic: Neat Mental Arithmetic Tricks
Replies: 33
Views: 5572

Re: Neat Mental Arithmetic trickses

I learned the divisibility test for 7 this last year, after teaching the rest of the divisibility rules to my students and finding out it existed: Double the last digit, subtract it from the remaining digits, is it a multiple of 7? If you can't tell, repeat the process until you know whether it is a...
by andrewxc
Thu May 30, 2013 1:26 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1110:"Click and Drag"
Replies: 595
Views: 671995

Re: 1110:"Click and Drag"

phlip wrote:No, he hasn't posted anything here for a good 3-4 years...

I read, "No, he hasn't posted anything good here for 3-4 years..."
I thought you wouldn't be that harsh...
by andrewxc
Wed May 29, 2013 5:22 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1215: Insight
Replies: 112
Views: 22214

Re: 1215: Insight

Nuclear power give off a lot of energy and a lot of that energy is x-ray and gamma radiation, the stuff that kills people. Less efficient sources of power give off predominately lower frequency energy such as heat and light. If the reactor is built properly, even people in the plant don't get expos...
by andrewxc
Wed May 29, 2013 5:20 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1215: Insight
Replies: 112
Views: 22214

Re: 1215: Insight

Google glasses: Fear, more distraction from reality. Actuality, hands free and HUD setup allow for more focus on reality as you don't have to look down at your phone to check stuff. (half the reason smart phones are so dangerous for texting is that you can't feel the keys with a touch screen and ha...
by andrewxc
Wed May 29, 2013 4:44 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1215: Insight
Replies: 112
Views: 22214

Re: 1215: Insight

"Maybe before we rush to adopt creationism, we should stop to consider the consequences of blithely giving this ideology such a central position in our classrooms."
Dear god, it's too powerful.
by andrewxc
Tue Feb 12, 2013 5:01 pm UTC
Forum: Science
Topic: FoldIt
Replies: 0
Views: 1033

FoldIt

Is anyone using FoldIt?
It appears to be down; I don't know if there's been any news about this (hacked? genuine DDoS (not malicious) from server overload?).
by andrewxc
Tue Jul 17, 2012 10:38 pm UTC
Forum: General
Topic: Relativity or something [Split from "Pressures"]
Replies: 5149
Views: 502427

Re: 1067: "Pressures"

It's probably too late for this, but the Tesla-Oatmeal comic author posted a rebuttal to the Forbes article:
http://theoatmeal.com/blog/tesla_response

He makes some good points, especially: "I'm a comedian; I speak in hyperbole for the sake of comedy."
by andrewxc
Thu Jan 26, 2012 9:03 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0881: "Probability"
Replies: 326
Views: 107269

Re: 0881: "Probability"

SirMustapha wrote:Next time, before you mention someone else's post count, make sure you look at your own.

Someone having only one post has nothing to do with their correctness. Poignant and well-spoken trumps whiny and indignant any day.
by andrewxc
Mon Jul 25, 2011 11:33 am UTC
Forum: Gaming
Topic: How important is on-line gaming to you as opposed to single
Replies: 40
Views: 6004

Re: How important is on-line gaming to you as opposed to sin

If you gamble for the payouts, you're an idiot; I know a few professional poker players who would disagree. :wink: As WarDaft states, you are playing against other players and your odds are much higher for winning anything. If you play against a system (which has been finely calibrated to ensure pa...
by andrewxc
Sat Jul 23, 2011 3:03 pm UTC
Forum: Gaming
Topic: Indie & Small Press Tabletop RPGs
Replies: 171
Views: 115195

Re: Indie & Small Press Tabletop RPGs

How about Richthofen's War? http://boardgamegeek.com/boardgame/1711/richthofens-war
My brother bought a copy back in '92 or so from someone's yard sale. I think it's missing parts, but it looks like an interesting idea.
by andrewxc
Sat Jul 23, 2011 2:57 pm UTC
Forum: Gaming
Topic: Mass Effect 2.
Replies: 1033
Views: 100300

Re: Mass Effect 2.

Your luck in Oblivion is at least right on your character sheet... :)
by andrewxc
Fri Jul 15, 2011 2:22 pm UTC
Forum: Gaming
Topic: Portal 2 : Princess No-Knees 3 : Jump Harder
Replies: 833
Views: 173131

Re: Portal 2 : Princess No-Knees 3 : Jump Harder

According to GLaDOS, there are two people, a male and a female, who share Chell's last name. She implies that they could be Chell's parents. After going back through the credits, I found her last name could be Coomer or Wright (multiplayer). Did anyone find any I missed? How about C...
by andrewxc
Fri Jul 15, 2011 1:59 pm UTC
Forum: Gaming
Topic: Portal 2 : Princess No-Knees 3 : Jump Harder
Replies: 833
Views: 173131

Re: Portal 2 : Princess No-Knees 3 : Jump Harder

According to GLaDOS,
Spoiler:
there are two people, a male and a female, who share Chell's last name. She implies that they could be Chell's parents. After going back through the credits, I found her last name could be Coomer or Wright (multiplayer). Did anyone find any I missed?
by andrewxc
Thu Jul 07, 2011 1:37 am UTC
Forum: Gaming
Topic: SpaceChem
Replies: 29
Views: 9626

Re: SpaceChem

As a part of the Summer Camp Specials, I have necroed this thread because Steam is selling SpaceChem for cheap(er).
by andrewxc
Tue Jun 28, 2011 2:48 am UTC
Forum: Mathematics
Topic: Mental Digit Memory
Replies: 12
Views: 2347

Re: Mental Digit Memory

I learned this system from a book when I was 12. 15 years later and it still serves me well. Here is a list as well as a way to remember each. 1 = t or d sound. 1 looks like a t. 2 = n sound. n has 2 legs. 3 = m sound. m has 3 legs. 4 = r sound. "four" ends in r. 5 = l sound. L is 50 in R...
by andrewxc
Thu Jun 23, 2011 5:01 pm UTC
Forum: Mathematics
Topic: How practical is a B.S. in Math?
Replies: 20
Views: 7781

Re: How practical is a B.S. in Math?

Everyone is on point here (except your mom). I think the top three jobs in the most recent jobs almanac were Mathematician, Actuary, and Statistician. A math degree is ideal for all three (majoring in math > majoring in statistics even if you want to be a statistician). Unless you enjoy the soul-su...
by andrewxc
Thu Jun 23, 2011 4:59 pm UTC
Forum: Mathematics
Topic: How practical is a B.S. in Math?
Replies: 20
Views: 7781

Re: How practical is a B.S. in Math?

My wife and lots of my friends down here in Maryland got degrees in Math and/or Computer Science and are working for the government. Five years out of college, they were making about $75k a year, plus bonuses for merit, not to mention great health benefits (public schools are usually the only ones t...
by andrewxc
Fri May 27, 2011 2:39 am UTC
Forum: Mathematics
Topic: Interesting Problems?
Replies: 33
Views: 4734

Re: Interesting Problems?

There is the Diophantine Equation: y^3 = x^2 + 2, which has only one solution, and that solution is easy enough to find. The interesting bit is that the proof that this is the only solution is quite tricky(I do not know the proof and am attempting to find it at present, so I do not wish to spoil it...
by andrewxc
Tue May 24, 2011 8:39 pm UTC
Forum: Gaming
Topic: Games you can't remember the title of.
Replies: 1941
Views: 560295

Re: Games you can't remember the title of.

Goddammit, I think I just found it...
http://www.fomportal.com

So "Face of Mankind" isn't really all that short, but I was seeing "FoM" in my head...
by andrewxc
Tue May 24, 2011 8:24 pm UTC
Forum: Gaming
Topic: Games you can't remember the title of.
Replies: 1941
Views: 560295

Re: Games you can't remember the title of.

Tough one for you guys, because it was a Beta when I played it... * Background: It was a free beta client, probably advertized by FilePlanet. * System: PC - WinXP. * Year: About 2004/2005, I tried the Beta. * Perspective: Either 1st or 3rd person. I think you could go either way. * Art style: Japane...
by andrewxc
Tue May 10, 2011 7:10 pm UTC
Forum: Mathematics
Topic: Four Color Theorem
Replies: 15
Views: 5969

Re: Four Color Theorem

Found my previous post WITH graphic and accompanying arguments:
viewtopic.php?f=17&t=57690&hilit=four+color#p2054868
by andrewxc
Tue May 10, 2011 5:38 pm UTC
Forum: Mathematics
Topic: Four Color Theorem
Replies: 15
Views: 5969

Re: Four Color Theorem

A Scientific American submission (Color Madness, http://www.scientificamerican.com/article.cfm?id=color-madness , Dec. 2002) gave six regions that were split up as the four corners of a rectangle and then two regions that approached each other à la Achilles' Paradox: they would snake up & down, ...
by andrewxc
Thu May 05, 2011 11:02 am UTC
Forum: Gaming
Topic: A cooperative hierarchical RTS: could it work?
Replies: 26
Views: 3438

Re: A cooperative hierarchical RTS: could it work?

Is this not what they are trying to do with Eve online? Nuking the entire battle field from orbit to add to the confusion too. :lol: Yes, they are attempting to do this with EVE: Online. I'm not sure how big the game can be / will be allowed to get. When I joined in 2004, the universe seemed so mas...

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