## Search found 6212 matches

Tue Nov 29, 2016 9:22 pm UTC
Forum: Mathematics
Topic: Three externally tangent circles sharing a single point of tangency
Replies: 19
Views: 4678

### Re: Three externally tangent circles sharing a single point of tangency

I can't really say that I see the small circle as any more natural than the large. If I want to describe where a missile can run out of fuel (a relatively natural question) whether its larger or smaller than a hemisphere is of little note.
Tue Nov 29, 2016 1:53 pm UTC
Forum: Mathematics
Topic: Three externally tangent circles sharing a single point of tangency
Replies: 19
Views: 4678

### Re: Three externally tangent circles sharing a single point of tangency

Nicias wrote:In sphereical geometry, you will have trouble with "external"

Not really. You just need to give circles their centres, and then it should follow.
Sat Jul 30, 2016 3:06 pm UTC
Forum: Logic Puzzles
Topic: Logic Puzzles - Admittedly, not naturally equipped to solve them...
Replies: 17
Views: 7717

### Re: Logic Puzzles - Admittedly, not naturally equipped to solve them...

I think what you are doing right now, Snarlock, has aspects that are really sensible and admirable, but also parts that are deeply misguided. The big problem I see here is mindset. You seem to have what's called a fixed mindset. What is better for you, your kids, and everyone else, is a growth minds...
Fri Jul 22, 2016 1:47 am UTC
Forum: Logic Puzzles
Topic: Escape the Frictionless Circle
Replies: 156
Views: 38417

### Re: Escape the Frictionless Circle

That the first answer that I've liked in this thread Shufflepants. Really nice work.
Sun Jul 10, 2016 5:07 am UTC
Forum: Mathematics
Topic: Trickier problem than it seems. (goat in a circular paddock)
Replies: 19
Views: 3815

### Re: Trickier problem than it seems. (goat in a circular paddock)

It won't have a closed form. Its a polynomial intersecting a trig function. No closed form for that unless you're super lucky.
Sun Jul 03, 2016 4:08 am UTC
Forum: News & Articles
Topic: Australian Election 2016
Replies: 9
Views: 3270

### Re: Australian Election 2016

From what I've heard, the Liberals (right-wing party) won in 2013 due to internal conflict between former PMs Kevin Rudd and Julia Gillard in the Labor (no u!) Party. The Liberal leader Tony Abbott proved his utter incompetence in the ensuing two years, and was sacked and replaced with the somewhat...
Sat Jul 02, 2016 1:54 pm UTC
Forum: News & Articles
Topic: Australian Election 2016
Replies: 9
Views: 3270

### Australian Election 2016

We just had an election, and its looking like a very close thing. Like, hung parliament close. There's a lot of background that is probably not that interesting to people not in this part of the world, but its a bit of a clusterfuck for the right. We also changed our voting methodology for the senat...
Wed Jun 29, 2016 2:16 am UTC
Forum: News & Articles
Topic: In other news... (humorous news items)
Replies: 14279
Views: 2023352

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

Hollywood has now fallen completely through the rabbit hole. "Tetris gets trilogy as story 'too big' to fit into single film." I think we'll find they just haven't put things together optimally. They'll've left gaps, been too hasty, and what's left will feel patchy and jumbled, despite th...
Mon Jun 27, 2016 2:19 pm UTC
Forum: Logic Puzzles
Topic: Two puzzles for the price of 1!
Replies: 17
Views: 4838

### Re: Two puzzles for the price of 1!

It's a series of puns (sore/saw, whole/hole, hoarse/horse). What dialect do you speak such that sore and saw are homophones? I've never, ever heard that. They don't even have the same vowel for me, let alone the same post-vowel sound (which is "none" for saw). I believe ConMan is from oz,...
Sat Jun 25, 2016 9:03 am UTC
Forum: Coding
Topic: Good books for learning to create proxy servers?
Replies: 18
Views: 6976

### Re: Good books for learning to create proxy servers?

Speaking of vague, maybe it's just me, but I have no idea what your first question means. Proper email verification is built into modern mail servers, AFAIK, and has nothing to do with using a single IP. The way I see it, there are a few different questions that a site could be intending to answer ...
Fri Jun 24, 2016 5:38 pm UTC
Forum: Coding
Topic: Good books for learning to create proxy servers?
Replies: 18
Views: 6976

### Re: Good books for learning to create proxy servers?

I think, for the first one, you want to be transparent with your user. Which means sending an email that they then demonstrate receiving by following some particular link, or inputting some particular data. Trying to sidestep this isn't sensible imo. Sure, formatting and sending emails that work wit...
Fri Jun 24, 2016 5:23 pm UTC
Forum: Logic Puzzles
Topic: Beautiful Puzzle I just remembered...
Replies: 2
Views: 3089

### Re: Beautiful Puzzle I just remembered...

Okay, I don't really want to do this but...

These are much more along the lines of linguistic tricks. And that's okay, I mean, lots of people are into that. But its not really what I want to encourage here in Logic Puzzles. So, please stop posting these sorts of linguistic puzzles. -jr
Tue Jun 14, 2016 12:56 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9841
Views: 1638619

### Re: Coding: Fleeting Thoughts

Okay, then I officially hate Java. Yeah, Java has primitive types that are mirrored by actual classes. The thing I'm actually learning, Scala, tidies this up into "everything is an object" (apart from the dot operator, and a few other things) but Java itself seems like a train-wreck of sh...
Mon Jun 13, 2016 11:38 am UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9841
Views: 1638619

### Re: Coding: Fleeting Thoughts

Okay, but now explain why Calendar.get(Calendar.DAY_OF_WEEK) ranges from 1 to 7 and Calendar.getTime.getDay() ranges from 0 to 6.
Mon Jun 13, 2016 11:36 am UTC
Forum: Mathematics
Topic: Completions, Cauchy sequences, and countability
Replies: 7
Views: 2946

### Re: Completions, Cauchy sequences, and countability

@OP: are you familiar with the first proof of uncountability that cantor wrote?

https://en.wikipedia.org/wiki/Georg_Can ... nd_theorem

It does produce two Cauchy sequences, and I think its very nearly what you want.
Mon Jun 13, 2016 8:00 am UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9841
Views: 1638619

### Re: Coding: Fleeting Thoughts

Nice choice of modula arithmetic Java. Zero out of ten. Go back and get it right this time...
Thu May 26, 2016 5:32 am UTC
Forum: Forum Games
Topic: Gender pronouns for our Forum Gamers!
Replies: 110
Views: 65736

### Re: Gender pronouns for our Forum Gamers!

↶ all this "made up" dismissal of neopronouns is really rude and silly. you incorporate neologisms into your vocabulary all the time. I largely agree with you here robin12, but so long as its not a whole lot of people coming in here to argue, and people aren't snarky towards others, I thi...
Fri May 20, 2016 4:46 pm UTC
Forum: Logic Puzzles
Topic: JavaScript chaining challenge
Replies: 6
Views: 2896

### Re: JavaScript chaining challenge

So that kills anything that takes a callback or doesn't do an (at least shallow) copy, and that leaves

Spoiler:

Code: Select all

`arr.slice(-1)[0]`
Fri May 20, 2016 11:33 am UTC
Forum: Logic Puzzles
Topic: JavaScript chaining challenge
Replies: 6
Views: 2896

### Re: JavaScript chaining challenge

I take it that you're saying that something is wrong with jaap's answer, in that it mutates the array.

I'm not sure I understand your length criteria. What would you say the length is of something like

Spoiler:

Code: Select all

`arr.reduce( function (total, value){return value;} );`
Fri Apr 15, 2016 7:35 am UTC
Forum: Mathematics
Replies: 185
Views: 241373

But you can publish with people who have published with people who have published with erdos, which would make your erdos number 3. And as soon as you collaborate with people, it will be very likely that you have a well defined erdos number. I agree that it has no deep meaning, but people will play ...
Mon Mar 28, 2016 1:06 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9841
Views: 1638619

### Re: Coding: Fleeting Thoughts

Does anyone know of a good guide for using ajax on rails that doesn't have all the client side code written in coffeescript? All the docs, naturally enough, use coffeescript...
Mon Mar 28, 2016 10:24 am UTC
Forum: Logic Puzzles
Topic: Need Help with a Substitution Code
Replies: 7
Views: 5411

### Re: Need Help with a Substitution Code

Spoiler:
They could be represented by adjacent letters, which would make the last line 5 symbols, not 3. But I'm not good at these, so...
Fri Mar 18, 2016 11:12 am UTC
Forum: News & Articles
Topic: 2016 US Presidential Election
Replies: 8482
Views: 805040

### Re: 2016 US Presidential Election

Quizatzhaderac Don't blame FPTP on the GOP's mistakes. It's the delegate rules such as thresholds minimums that allows Trump to win with a plurality. Effects have multiple causes. You may be right about the other Republican policies doing this job, but I was really making a statement about voting s...
Wed Mar 16, 2016 12:20 pm UTC
Forum: News & Articles
Topic: In other news... (humorous news items)
Replies: 14279
Views: 2023352

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

Not even slightly a go expert, but when I used to play, I used to read a lot about the good players and how they would play the man more than the position. They would know the flavour of go that the other person was going to play and do what they could with that information ie plan with it, set trap...
Sun Mar 06, 2016 5:41 am UTC
Forum: News & Articles
Topic: 2016 US Presidential Election
Replies: 8482
Views: 805040

### Re: 2016 US Presidential Election

That's a little reminiscent... of things. You know what I mean.
Thu Feb 25, 2016 9:51 am UTC
Forum: Mathematics
Topic: Is math real?
Replies: 105
Views: 14770

### Re: Is math real?

...Now we've decided that in fact nothing is falling, or going back and forth - in fact everything is going in a straight line, but heavy things can change what a straight line is. And someone had to invent ridiculously crazy geometry and calculus to work *that* out... Actually, there was no need t...
Wed Feb 17, 2016 4:03 am UTC
Forum: Mathematics
Topic: Infinite Inscribed Squares
Replies: 10
Views: 2437

### Re: Infinite Inscribed Squares

Cool. I was just a bit worried about the speed of the convergence, but I believe it now.
Tue Feb 16, 2016 9:02 pm UTC
Forum: Mathematics
Topic: Infinite Inscribed Squares
Replies: 10
Views: 2437

### Re: Infinite Inscribed Squares

i: x, s, a 0: 0.707106781186548, 1.414213562373095, 2.000000000000000 1: 0.989949493661166, 0.282842712474619, 2.080000000000000 2: 0.999987404962770, 0.010037911301604, 2.080100759663299 3: 0.999999999980171, 0.000012595017400, 2.080100759821933 4: 1.000000000000000, 0.000000000019829, 2.080100759...
Tue Feb 16, 2016 6:00 am UTC
Forum: News & Articles
Topic: 2016 US Presidential Election
Replies: 8482
Views: 805040

### Re: 2016 US Presidential Election

Trump once again threatens a third-party run. Wouldn't that damage his brand (to use that shitty advertising style of speech)? He presents as a straight shooter, and real. He stated in one of the debates that he would not run as a third party candidate. So obviously going against his word would sur...
Sun Feb 14, 2016 9:05 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9841
Views: 1638619

### Re: Coding: Fleeting Thoughts

And note that you can set a breakpoint on that line in your code, then see what the types are. It would have been immediately obvious when you saw that "anarray" had the value "1". ^_^ Yeah, I tried console.logging stuff and just couldn't work out what was happening. I should ha...
Sun Feb 14, 2016 9:00 pm UTC
Forum: Mathematics
Topic: Initial seeds for Aberth's method
Replies: 1
Views: 1433

### Re: Initial seeds for Aberth's method

I used Aberth a while back. I found the upper and lower bounds on the modulus of the roots via Rouche, took the geometric mean and placed the roots evenly around the circle of that radius and got good convergence. But remember, try to get rid of the repeated roots first, because you will get bad con...
Sun Feb 14, 2016 9:47 am UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9841
Views: 1638619

### Re: Coding: Fleeting Thoughts

Thanks, that was a lot easier than I thought it would be, I should have worked it out myself.
Sun Feb 14, 2016 4:29 am UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9841
Views: 1638619

### Re: Coding: Fleeting Thoughts

I'm learning javascript using "eloquent javascript" which you can find on the web. There's an exercise where you want to convert a list (ie an object with a "value" and "rest" property, with rest being either another list or null) to an array (ie the standard javascript...
Thu Feb 11, 2016 1:29 am UTC
Forum: News & Articles
Topic: In other news... (humorous news items)
Replies: 14279
Views: 2023352

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

The phone market is weird. Things I care about (MicroSD cards, removable batteries, physical buttons, one-handed design) have become rarer and rarer. Things that really have no bearing on good / bad (aluminum covers, thinner phones, phones as big as 6-inches, resolution so good your eyes literally ...
Fri Feb 05, 2016 8:42 pm UTC
Forum: Mathematics
Topic: Infinite balls
Replies: 6
Views: 2062

### Re: Infinite balls

I think its unintuitive to the lay person because it asks us questions about what is essentially impossible from a physical perspective. And sure, you can resolve the issue, using the sorts of reasoning that Cauchy brings up, and go further and suggest that Cauchy's resolution is the only sensible r...
Thu Feb 04, 2016 4:41 am UTC
Forum: Mathematics
Topic: INT Function
Replies: 13
Views: 2546

### Re: INT Function

if x > 0: while x >0: x -= 1 return x == 0 elif: while x >0: x += 1 return x == 0 It'll do a finite number of steps for any integer, but its not the same steps for every integer, which is what you want I believe. If that is what you want, the absence of such a formula feels like a consequence of th...
Mon Feb 01, 2016 1:40 am UTC
Forum: Logic Puzzles
Topic: The Two Oracles - a statistics problem
Replies: 74
Views: 11105

### Re: The Two Oracles - a statistics problem

Mathematical analysis to show these really are the extreme cases: Let's make four probabilities, a,b,c,d, and say that a is the chance that both oracles are correct, b is the chance the first is correct and the second is wrong, c is the chance that the first is wrong and the second is right, an...
Thu Jan 28, 2016 8:13 pm UTC
Forum: Mathematics
Topic: Why is this limit so wierd?
Replies: 3
Views: 1691

### Re: Why is this limit so wierd?

nb: this is just the derivative of 5*(e^x) at x=0. Think about the gradient's that function has and you should be reassured.
Mon Jan 25, 2016 3:38 pm UTC
Forum: Science
Topic: Probable ninth planet?
Replies: 30
Views: 4429

### Re: Probable ninth planet?

Question: Would the Wise-Field Infrared Survey Explorer data have the evidence for such a planet, just uncollated? Depends on the size and location, I think. According to a recent xkcd, that is right, and no doubt it was designed to find objects that we already had a pretty decent idea about. Still...
Sun Jan 24, 2016 1:21 pm UTC
Forum: Science
Topic: Probable ninth planet?
Replies: 30
Views: 4429

### Re: Probable ninth planet?

Question: Would the Wise-Field Infrared Survey Explorer data have the evidence for such a planet, just uncollated?