## Search found 614 matches

Tue Jul 30, 2013 5:08 pm UTC
Forum: General
Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
Replies: 908
Views: 171018

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

From a strictly mathematical approach a coordinate system is defined as a mapping between a set of points and a set of coordinates. If you do not have any points, you do not have a coordinate system, and if S and S' are not coordinate systems, all your discussion of S and S' being coincident is so m...
Tue Jul 30, 2013 3:27 pm UTC
Forum: News & Articles
Topic: In other news... (humorous news items)
Replies: 15144
Views: 2631180

### Re: In other news... (humorous news items, etc)

LaserGuy wrote:Does a posthumous pardon mean that the government can be held liable for damages by the person's heirs?

No, because being pardoned is different from being wrongly convicted.
Sun Jul 28, 2013 2:47 pm UTC
Forum: Mathematics
Topic: How to convince a friend the equivalence of infinite sets
Replies: 32
Views: 8152

### Re: How to convince a friend the equivalence of infinite set

You can do a similar procedure to the mapping of naturals to evens to his geometric representation. Divide your Cartesian plane into 1x1 squares. Take all the squares that are in the first quadrant and entirely under the curve y=x and number them starting in the lower left working up in columns (so ...
Sat Jul 27, 2013 4:53 pm UTC
Forum: General
Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
Replies: 908
Views: 171018

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

GIVEN S(x,y,z) spatially coincident with S'(x',y',z') and x = x', y = y', z = z', There are NO points. There is case 1 and case 2. If there are no points then S and S' are not coordinate systems (as I mentioned earlier, a coordinate system is a mapping of coordinates onto a set of points) and talki...
Sat Jul 27, 2013 2:35 pm UTC
Forum: General
Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
Replies: 908
Views: 171018

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

it remains true that x = x', even if the two systems are no longer spatially coincident. If x and x' are the coordinates in two systems of the same point, then this statement is completely, entirely, manifestly false, and repeating it will not make it true. If the coordinate system S' changes (for ...
Wed Jul 24, 2013 1:04 am UTC
Forum: General
Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
Replies: 908
Views: 171018

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

True, Keeping in mind, please, "mathematics in not subjective". So, from my point of view, given S(x,y,z) defines x, as the first coordinate (distance). For me, there is no "choice", up for grabs. x, for me, is inherent to S, given Cartesian coordinate system S(x,y,z). Just as x...
Tue Jul 23, 2013 8:27 pm UTC
Forum: General
Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
Replies: 908
Views: 171018

### Re: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x

steve waterman wrote:
yurell wrote:everyone else believes x' = x - d equates the relationship of points in the manifold between the two mappings.

This is not a relationship between points. It is a relationship between coordinates in different systems for a single point.
Fri Jul 19, 2013 3:02 pm UTC
Topic: Religion: The Deuce
Replies: 5301
Views: 587541

### Re: Religion: The Deuce

Well, that's why Jesus gave us the Book of Mormon in English... No he didn't. He just gave Joseph Smith a pair of magical spectacles that allowed him to unerringly translate them into English. Too bad Joseph Smith had to give them back along with the originals of the book of Mormon when he was done...
Fri Jul 19, 2013 2:43 pm UTC
Forum: General
Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
Replies: 908
Views: 171018

### Re: Galilean:x' with respect to S'?

Given coincident Cartesian coordinates systems S(x,y,z) and S'(x',y',z'), where x = x', y = y', z = z' Steve, do you accept the possibility that there might exist coordinate systems which are neither Cartesian nor coincident? Do you accept that the rules and equations which are true in the case of ...
Wed Jul 17, 2013 4:30 pm UTC
Forum: General
Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
Replies: 908
Views: 171018

### Re: Galilean:x' with respect to S'?

MY approach - what if we did allow points in the manifold to move as the origin of the moving system does ? Then you wouldn't be doing a coordinate transformation and what you would be would have exactly zero applicability to the question at hand. What you're doing is not a coordinate transformatio...
Fri Jul 12, 2013 5:18 pm UTC
Forum: News & Articles
Topic: In other news... (humorous news items)
Replies: 15144
Views: 2631180

### Re: In other news... (humorous news items, etc)

Whoops, meant this guy . Though there's a fair argument that he was ethnically German. (He was born in a predominantly German-speaking city in Poland to a family of Slavic, but not Polish, origin, and there's some evidence he considered German his first language. The cultural and ethnic history of ...
Fri Jul 12, 2013 12:04 pm UTC
Forum: General
Topic: Most excellent times
Replies: 5132
Views: 905241

Some time ago, someone in xkcd linked Garwin Kinematics of an Ultraelastic Rough Ball , and I finally got through my backlog to it. In short, someone is amazing! That was a very enjoyable read and a nice explanation for a relatively simple phenomenon — I used to love playing with bouncey balls as a...
Tue Jul 02, 2013 3:42 pm UTC
Forum: XKCD Meetups
Topic: [US] Cambervillains (Boston Area)
Replies: 3400
Views: 604526

### Re: Cambervillain Indecipherable Meetup Thread (Boston Area)

Damn, I've been keeping an eye out for a chance to meet and mingle with forafolk for a long time now, and then two oppurtunities pop up on the one week when I'm going to be out of town.
Tue Jul 02, 2013 4:45 am UTC
Forum: General
Topic: Most excellent times
Replies: 5132
Views: 905241

Still, point is that it's a character he's not worked with in nearly two decades. He's changed since then. Might not be a good fit. Only one decade since he last wrote a Sandman comic. Though that's still a long time. Edited to add: I also think it makes a difference that he's mentioned publicly se...
Mon Jul 01, 2013 10:42 pm UTC
Forum: General
Topic: Most excellent times
Replies: 5132
Views: 905241

Still, Neil's still writing halfway-decent stuff these days (although I haven't read his most recent one). Unlike Frank "As I've aged I've tried less and less to hide my belief that all women are prostitutes" Miller. In fairness, Miller's recent work hasn't just been about how all women a...
Mon Jul 01, 2013 12:46 am UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 711674

### Re: RELATIVITY QUESTIONS! (and other common queries)

I think they're referring to the sign in the metric (e.g., normally the Schwarzschild Metric (t,r,θ,φ) is (-,+,+,+), but once you pass the event horizon it becomes (+,-,+,+), that is to say that the radial dimension becomes 'like time', and the temporal dimension becomes 'like space') Ah, see, this...
Mon Jul 01, 2013 12:39 am UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 711674

### Re: RELATIVITY QUESTIONS! (and other common queries)

Someone who knows better than I do will probably be along to correct me, but I was under the impression that only intervals can be space-like or time-like, not dimensions. Talking about space-like dimensions is a bit like talking about whether your bicycle is a V6 or a V8, the terminology just isn't...
Tue Jun 25, 2013 11:38 am UTC
Forum: XKCD Meetups
Topic: [US] Cambervillains (Boston Area)
Replies: 3400
Views: 604526

### Re: Cambervillain Indecipherable Meetup Thread (Boston Area)

Election day! Polls are open. Get your vote on people.

Edited to add: If you don't know where your polling place is, go here: WhereDoIVoteMA.com
Sat Jun 22, 2013 5:10 pm UTC
Forum: XKCD Meetups
Topic: [US] Cambervillains (Boston Area)
Replies: 3400
Views: 604526

### Re: Cambervillain Indecipherable Meetup Thread (Boston Area)

I'll try to be a little more timely with the reminder this time: MASSACHUSETTS PEOPLE! ELECTION DAY IS THIS TUESDAY, THE 25TH! POLLS OPEN AT 7AM AND CLOSE AT 8PM! GO AND VOTE! (Also, if you're in the Camberville area and are interested in helping send a national leader on environmental issues, and a...
Mon Jun 17, 2013 11:15 pm UTC
Forum: Fictional Science
Topic: WWII Weaponry (w/ Time Traveller)
Replies: 18
Views: 8304

### Re: WWII Weaponry (w/ Time Traveller)

Edit: Phoning the Kremlin with word of Hitler's intentions would certainly shake things up too. If Russia mobilizes ahead of time then the war would be a lot shorter... I'm not actually sure that that's the case. The reasons that 1941 and 42 were so very very bad for the Red Army had a lot more to ...
Fri Jun 07, 2013 12:35 pm UTC
Forum: Science
Topic: sabotage of space
Replies: 17
Views: 5989

### Re: sabotage of space

It also depends on how densely populated the orbit you're targeting is. Weapons like this don't get really nasty until the population of satellites gets big enough to spark a Kessler syndrome situation, where each collision creates enough debris to cause, on average, at least one more collision, and...
Thu Jun 06, 2013 3:06 pm UTC
Forum: What If?
Topic: What-If 0048: "Sunset on the British Empire"
Replies: 75
Views: 28872

### Re: What-If 0048: "Sunset on the British Empire"

SlyReaper wrote:Of course we all know the reason the sun never sets on the british empire; god wouldn't trust an englishman in the dark.

Can't blame him, he was a public school boy, after all.
Wed Jun 05, 2013 4:58 am UTC
Forum: Science
Topic: Telephone poles and nuclear bombs.
Replies: 26
Views: 7582

### Re: Telephone poles and nuclear bombs.

It's worth noting that the 42,000 MJ figure is for a nuclear artillery shell which actually had a slightly lower yield than the largest conventional bunker-busters in the current US arsenal. At .1kT, it was a full three orders of magnitude smaller than the bombs that leveled Hiroshima and Nagasaki, ...
Mon Jun 03, 2013 5:27 pm UTC
Forum: News & Articles
Topic: In other news... (humorous news items)
Replies: 15144
Views: 2631180

### Re: In other news... (humorous news items, etc)

Xeio wrote:Also potentially interesting; Scalia, Ginsburg, Sotomayor, and Kagan as the dissenting opinion?

4th amendment cases have a long history of producing strange bedfellows between libertarian conservatives and liberals who are skeptical of police overreach.
Sun Jun 02, 2013 1:46 pm UTC
Forum: Language/Linguistics
Topic: When "Gothic" means "Dark" Not even Etymologyman can save us
Replies: 8
Views: 7382

### Re: When "Gothic" means "Dark" Not even Etymologyman can sav

Gothic has followed a perfectly logical series of changes, even if the result is that the current meaning is far from the original. And the "misuse" that you seem so concerned about is actually centuries old. To recap and expand on what eSOANEM said: A Goth was originally a member of a gro...
Tue May 28, 2013 6:48 pm UTC
Forum: Language/Linguistics
Topic: A certain "backwards" phrasing in English
Replies: 18
Views: 10459

### Re: A certain "backwards" phrasing in English

Even the original phrase seems strange and clunky to my ears. Are you quite sure you didn't mean to use the idiomatic phrase "come to life" to describe a nonliving thing that becomes living?
Tue May 28, 2013 1:40 pm UTC
Forum: News & Articles
Topic: Company Using Sex Offender Registries For Extortion
Replies: 43
Views: 14771

### Re: Company Using Sex Offender Registries For Extortion

Ormurinn wrote:One libel case would be enough to bankrupt a website the person bringing it - the rest should fall into line and pay their couple hundred bucks to get taken off the website after that.

Fixed that for you.
Sun May 19, 2013 4:12 am UTC
Forum: Movies and TV Shows
Topic: The Great Gatsby
Replies: 14
Views: 5011

### Re: The Great Gatsby

Well, that was a better movie than I expected given that Baz Luhrmann met my expectations by completely failing to understand a single character that Fitzgerald wrote. The worst was his transformation of Daisy into a generic damsel in distress, where in the book her destructive narcissism (and Gatsb...
Wed May 15, 2013 5:38 pm UTC
Forum: Gaming
Topic: Great Steam Deals (And other Online Distribution Systems)
Replies: 2641
Views: 542537

### Re: Great Steam Deals (And other Online Distribution Systems

Weird, I seem to have somehow acquired three coupons for 75% off Shogun Total War 2, good through the 23rd. I already own the game, as do all my friends with Steam accounts, anyone here interested?
Sun May 12, 2013 11:18 pm UTC
Forum: News & Articles
Replies: 55
Views: 12234

### Re: AK School Cancels 6th Grade Grad Rather Than Not Pray

That said the french are naturally laid back enough to not get all hyped up on their own self importance and go round annexing their neighbors, a strong national identity may not be for everyone! I'm not so sure that's true. Just because they haven't done it in a couple generations doesn't mean tha...
Wed May 08, 2013 12:08 pm UTC
Forum: Mathematics
Topic: Mean value!!!
Replies: 12
Views: 3015

### Re: Mean value!!!

The problem with that is that mean value already has a well defined meaning in mathematics.
Sat May 04, 2013 3:16 pm UTC
Forum: Science
Topic: Evolution question - how does complexity arise?
Replies: 201
Views: 28285

### Re: Evolution question - how does complexity arise?

I must admit, I'm struggling with the title question: How does complexity not arise? Given that mutations happen more or less at random, and some mutations are bound to make an organism more complex (for a given definition of 'complex' - eg. a doubling of the green gene followed by turning it to re...
Sat May 04, 2013 2:38 pm UTC
Forum: Science
Topic: Evolution question - how does complexity arise?
Replies: 201
Views: 28285

### Re: Evolution question - how does complexity arise?

Ben, the way you're using the terms "random" and "selection" makes me think you're still unclear on how selection actually works. Selection is random in the sense that it is not strictly mechanistic (mutations generaly do not guarantee either survival or extinction, merely influe...
Thu May 02, 2013 11:34 am UTC
Forum: XKCD Meetups
Topic: [US] Cambervillains (Boston Area)
Replies: 3400
Views: 604526

### Re: Cambervillain Indecipherable Meetup Thread (Boston Area)

Because it's not like an unknown candidate with a pretty face, a vague policy platform, and a campaign built on being an "outsider" has ever upset a liberal Democrat in a low-turnout special election for U.S. Senate in Massachusetts. Or that such an upset could completely derail the nation...
Wed May 01, 2013 3:56 am UTC
Forum: XKCD Meetups
Topic: [US] Cambervillains (Boston Area)
Replies: 3400
Views: 604526

### Re: Cambervillain Indecipherable Meetup Thread (Boston Area)

Arghhhh I remembered like 8 times today but then I came home late and totally forgot :( As penance I prescribe that you come to Somerville and volunteer for the Markey campaign at least twice. (No, seriously, anyone who's in the Camberville area and wants to make a difference on gun control, climat...
Tue Apr 30, 2013 4:10 pm UTC
Forum: XKCD Meetups
Topic: [US] Cambervillains (Boston Area)
Replies: 3400
Views: 604526

### Re: Cambervillain Indecipherable Meetup Thread (Boston Area)

Y'all should go out and vote today.
Tue Apr 23, 2013 1:38 pm UTC
Forum: News & Articles
Topic: Bombing at Boston Marathon Finish Line.
Replies: 721
Views: 107749

### Re: Bombing at Boston Marathon Finish Line.

I agree that it is very silly that the law was written in a way that uses a much broader definition of the term "Weapons of Mass Destruction" than that commonly used by experts for decades. And the law should be rewritten to use a less scary term, and possibly to narrow the definition some...
Sun Apr 21, 2013 2:20 am UTC
Forum: News & Articles
Topic: Bombing at Boston Marathon Finish Line.
Replies: 721
Views: 107749

### Re: Bombing at Boston Marathon Finish Line.

Yeah, the Geneva Conventions have two clear categories: lawful and unlawful combatants. Lawful combatants are governed by the Geneva Conventions. Unlawful combatants are essentially criminals, and they should be tried as such under the laws of the detaining country. The Bush administration created t...
Sun Apr 21, 2013 12:54 am UTC
Forum: News & Articles
Topic: Bombing at Boston Marathon Finish Line.
Replies: 721
Views: 107749

### Re: Bombing at Boston Marathon Finish Line.

Unlawful combatant comes out of the Geneva Conventions. The term that the Bush administration used was "Enemy Combatant." Another example of the Bush administration's genius for taking terms that have specific technical meanings and using them in ways that were technically correct while t...
Sat Apr 20, 2013 12:03 am UTC
Forum: News & Articles
Topic: Bombing at Boston Marathon Finish Line.
Replies: 721
Views: 107749

### Re: Bombing at Boston Marathon Finish Line.

As for the number of officers needed. A 1 km radius circle would require only 30ish officers assuming clear vision (they'd only need to see about 100m away). You probably need signifantly more since not all roads will be straight, you don't want them to be too obvious targets and probably in pairs....