## Search found 171 matches

- Wed Oct 11, 2017 7:08 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1901: "Logical"
- Replies:
**24** - Views:
**4865**

### Re: 1901: "Logical"

Guaranteed flame-war comic. Let's get started, then! A conclusion can be logical and science-driven without necessarily referencing a particular study. It should be based on the scientific consensus, which, yes, ultimately goes back to studies, experiments and theories developed over the centuries....

- Sun Oct 23, 2016 1:04 pm UTC
- Forum: Mathematics
- Topic: 'Math is Pseudoscience and Fake Astrology' (Strange, Fringe Views by Prominent Figures)
- Replies:
**10** - Views:
**5836**

### Re: 'Math is Pseudoscience and Fake Astrology' (Strange, Fringe Views by Prominent Figures)

Maths with real world applications is 'reasonable'; Maths without is 'baloney'. Ok... But you can't model radioactive decay without probability theory; You need Newtonian mechanics to land a spacecraft on the Moon and relativity to predict the orbit of Mercury; You can't build modern computer chips...

- Thu Aug 18, 2016 7:22 pm UTC
- Forum: Mathematics
- Topic: How to Calculate Pi without a Calculator?
- Replies:
**66** - Views:
**12677**

### Re: How to Calculate Pi without a Calculator?

I need something more accurate. 22/7 results in a repeating decimal, I believe. What do you mean when you say calculating sums? He means something like this : in the Wikipedia article linked before there are a lot of options, and this one has some more that may be usable. It may be worth it to look...

- Wed Feb 10, 2016 8:24 pm UTC
- Forum: Mathematics
- Topic: INT Function
- Replies:
**13** - Views:
**2996**

### Re: INT Function

What about checking whether sin(πx) is zero? (My guess is that it works but you need more than first order logic to define that, am I correct?).

- Sun Jan 24, 2016 1:06 pm UTC
- Forum: Mathematics
- Topic: Free online Number theory exercises with solutions?
- Replies:
**1** - Views:
**1521**

### Re: Free online Number theory exercises with solutions?

You should be reading a textbook that has exercises: that way you can be sure that the exercises you're doing are approachable with the material you're learning. This PDF has textbooks which probably have exercises.

- Sun Dec 27, 2015 11:08 am UTC
- Forum: Mathematics
- Topic: difference between euler and leapfrog integrator
- Replies:
**5** - Views:
**2989**

### Re: difference between euler and leapfrog integrator

I investigated a bit, and your confusion stems from the fact that regular Euler differs from symplectic Euler (which has properties similar to leapfrog), but they actually coincide for constant acceleration. So, for your example, there really isn't that much of a difference between Leapfrog and Eule...

- Wed Dec 23, 2015 3:43 pm UTC
- Forum: Coding
- Topic: Evidence-Oriented Programming
- Replies:
**9** - Views:
**4863**

### Re: Evidence-Oriented Programming

After listening to his talk, it seems really fascinating. Although, when he talks about things like "Returning" not having anything positive, but having no good replacements, I wonder if that isn't evidence that the word itself should be removed. Instead of Action Concatenate(Text left, T...

- Sat Nov 14, 2015 1:04 am UTC
- Forum: News & Articles
- Topic: Over 100 dead in shooting, bombing in Paris
- Replies:
**136** - Views:
**26710**

### Re: Over 100 dead in shooting, bombing in Paris

Does anyone know what's up with the fire in Calais? Some sources say that it's a hoax and the photos are from a fire from 2Nov, but there's a polish reporter claiming that it's there and it's happening.

- Sat Oct 10, 2015 4:28 pm UTC
- Forum: News & Articles
- Topic: In other news... (humorous news items)
- Replies:
**15072** - Views:
**2485046**

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

And Donald Trump had similar insights to share. Hey, Trump actually said something reasonable in the middle of all that: [...] He said better mental health care would help curb future shootings. “Many states and many cities are closing their mental health facilities and closing them down, and they’...

- Sun Jun 21, 2015 10:47 pm UTC
- Forum: Computer Science
- Topic: Deliberately bad algorithms
- Replies:
**120** - Views:
**53471**

### Re: Deliberately bad algorithms

One thing that has always bugged me about Haskell is the community's fetish for point free function definitions, resulting in the most unreadable mess of symbols since APL. This, loeb = fix (fmap . flip id =<<) is unreadable, and should never be used outside of a golf competition. This, loeb fs = x...

- Sun Jun 21, 2015 10:24 pm UTC
- Forum: Serious Business
- Topic: Is there anything objective about morality?
- Replies:
**720** - Views:
**87926**

### Re: Is there anything objective about morality?

But that is the same type of argument being made against the existence of objective morality. Suppose someone manages to produce a moral claim that is widely accepted. The rebuttal would be "Just because lots of people share that belief doesn't make it objectively true for the universe". ...

- Thu Jun 18, 2015 10:42 am UTC
- Forum: News & Articles
- Topic: Racial Identity (Rachel Dolezal's resignation)
- Replies:
**87** - Views:
**15865**

### Re: Racial Identity (Rachel Dolezal's resignation)

I have to second that "why?" In general terms, not specifically in her case--in her case in particular, it seems entirely possible that she's lied about some things. But I haven't seen an actual argument against "transracial" identity in and of itself, and in particular why it's...

- Sun Jun 07, 2015 11:03 am UTC
- Forum: Serious Business
- Topic: Is there anything objective about morality?
- Replies:
**720** - Views:
**87926**

### Re: Is there anything objective about morality?

If there aren't better and worse moral frameworks, I don't think we have much anything to talk about in any moral debate, which to me automatically means I'm siding with objectivism. But that's wrong: to do moral debates, all that's needed is that all participants share a moral framework (which cou...

- Fri Jun 05, 2015 9:03 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1516: "Win by Induction"
- Replies:
**103** - Views:
**28954**

### Re: 1516: "Win by Induction"

Reasoning with infinity is tricky. If you double the number of pixels on your screen an infinite number of times (by halving each pixel an infinite number of times), do you wind up with a countably or uncountably infinite number of pixels? Similarly, what is the cardinality of the set of all ordere...

- Fri May 22, 2015 12:15 pm UTC
- Forum: News & Articles
- Topic: The Thread To Remind Me We're Living In The Future
- Replies:
**1880** - Views:
**347115**

### Re: The Thread To Remind Me We're Living In The Future

And if the elite is unethical enough to let billions of people live in squalor, do you really think they'll be above genocide? Yes. Letting people live in poverty is one thing: you don't have to actually do anything, and if you isolate yourself from the poor people, you can just forget it and live ...

- Thu May 21, 2015 1:42 pm UTC
- Forum: Mathematics
- Topic: Statistics. Conditional probability and percentage.
- Replies:
**4** - Views:
**1919**

### Re: Statistics. Conditional probability and percentage.

All students are either men or women, so the probability of a given person studying mathematics is the probability of that person being a man and studying mathematics, plus the probability of that person being a woman and studying mathematics. That's not what we're told, though: we only have the pro...

- Wed May 20, 2015 1:44 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1527: "Humans"
- Replies:
**97** - Views:
**22943**

### Re: 1527: "Humans"

commodorejohn wrote:Anybody who thinks scientific accuracy should take precedence over entertainment shouldn't be allowed anywhere near entertainment.

To be fair, in this case I think it would be way cooler to be scientifically accurate. Feathered dinosaurs are the bomb.

- Sun May 17, 2015 10:22 am UTC
- Forum: Mathematics
- Topic: Cutting and rearranging a half-colored square
- Replies:
**28** - Views:
**3946**

### Re: Cutting and rearranging a half-colored square

Color assignment only happens once at the beginning. Everything that happens afterwards simply involves moving the points/pieces around. No piece is thrown away and no colors are reassigned. The square can't just lose its color. In my opinion, the square would become pink as the number of iteration...

- Sat May 16, 2015 9:08 pm UTC
- Forum: Mathematics
- Topic: Cutting and rearranging a half-colored square
- Replies:
**28** - Views:
**3946**

### Re: Cutting and rearranging a half-colored square

I'm pretty sure your map is actually undefined on the dyadics at the limit: eventually they will always be between two regions, and then you can't assign them a clear color. Sure, you can say that the left boundary is white and the right one is red, but what about the middle? And what about the othe...

- Sat May 09, 2015 11:14 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1516: "Win by Induction"
- Replies:
**103** - Views:
**28954**

### Re: 1516: "Win by Induction"

Yes, I did mention that I'm programmer, a computer science absolutely requires finitist mathematics. For example a Cartesian join of large finite sets isn't always possible, so assuming it's possible just ruins the utility of mathematics. So there's a set of problems where infinite mathematics cann...

- Wed May 06, 2015 6:41 pm UTC
- Forum: Serious Business
- Topic: Segregated Bathrooms [Thread Split]
- Replies:
**165** - Views:
**38837**

### Re: Orthodox Judaism & Sexism [Title Change]

It wasn't a reason for segregating bathrooms. The reasons for segregating bathrooms include safety and privacy. My point was that, once you have decided to have exactly two bathrooms, you can tailor the two bathrooms to best suit the majority of the two parties involved, even though not all the cha...

- Wed May 06, 2015 2:30 pm UTC
- Forum: Serious Business
- Topic: Segregated Bathrooms [Thread Split]
- Replies:
**165** - Views:
**38837**

### Re: Orthodox Judaism & Sexism [Title Change]

Well, in regards to having two different bathrooms - unless you want to have an absurd number of different bathrooms, if you are planning your floor plan you go by numbers. Most women have some characteristics that men don't, and most men have some characteristics that women don't. So in the women'...

- Sat May 02, 2015 9:54 pm UTC
- Forum: Mathematics
- Topic: What are monster groups and why do they exist?
- Replies:
**7** - Views:
**2911**

### Re: What are monster groups and why do they exist?

I think the more interesting question is why there isn't an infinite number of sporadic groups, or an infinite number of infinite families of groups. Firstly, their are a countable infinite number of finite simple groups. This is essentially a consequence of the fact that the theorem is specificall...

- Sat May 02, 2015 4:51 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1505: "Ontological Argument"
- Replies:
**278** - Views:
**40389**

### Re: 1505: "Ontological Argument"

I suspect it works fine in precisely the same way that the left-right spectrum division of politics works fine. Sufficiently good when cultural positions are similar enough to collapse down to a one dimensional political manifold, but destined to fail if you sit an American Libertarian and a Europe...

- Fri Apr 17, 2015 10:13 am UTC
- Forum: Serious Business
- Topic: Self Perception of Gender and Sexuality
- Replies:
**60** - Views:
**18301**

### Re: Self Perception of Gender and Sexuality

If we accept cis-by-default as a thing, then would it really be surprising if this is true of most people? Certainly without a more careful study (of which there is basically none right now), we can't discard that possibility. Your last statement is not true though. The theory does not imply that m...

- Fri Apr 17, 2015 8:55 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1513: "Code Quality"
- Replies:
**81** - Views:
**18842**

### Re: 1513: "Code Quality"

Every last bit of excitement, interest and hope I had for Swift has just evaporated in that instant. If such a moronic decision made it onto the feature discussion agenda, let alone got formally proposed, let alone got passed, approved and implemented, that is insane; I think I'd rather spend the r...

- Thu Apr 16, 2015 8:36 pm UTC
- Forum: Serious Business
- Topic: Self Perception of Gender and Sexuality
- Replies:
**60** - Views:
**18301**

### Re: Self Perception of Gender and Sexuality

Slate Star Codex talked about the idea of "cis by default" awhile ago here , the original idea coming from here . To summarize from the latter link: This makes a lot of sense to me. I'm a guy and I mostly like guy things, but it doesn't feel like an essential part of my identity. I would ...

- Mon Apr 06, 2015 11:25 pm UTC
- Forum: Mathematics
- Topic: Closed infinite intersection of open sets
- Replies:
**11** - Views:
**4009**

### Re: Closed infinite intersection of open sets

Your argument is perfectly valid for the intersection of two sets: the intersection of two sets is open. Just in that case. Technically, you haven't even proved it for, say, three sets: just for two. To prove that it works for more than two sets, you need to use induction: so your argument can be ex...

- Mon Apr 06, 2015 10:34 am UTC
- Forum: Mathematics
- Topic: function points
- Replies:
**35** - Views:
**6386**

### Re: function points

Where does this notation come from? Did you invent it yourself? Read it somewhere? Someone taught it to you?

What was your question again? I am making baby steps towards understanding what you're saying, but I don't even know what I'm supposed to look for.

What was your question again? I am making baby steps towards understanding what you're saying, but I don't even know what I'm supposed to look for.

- Sun Apr 05, 2015 2:52 pm UTC
- Forum: Mathematics
- Topic: function points
- Replies:
**35** - Views:
**6386**

### Re: function points

Your way of writing stuff is still very cryptic, but I think we're going forward. A lot of times, you write terms in the form: a≥x≥b ( a≥y≥b ) x (y) that is, something followed with a parenthesis. What does that mean? Are you asking for a way to represent the surface of a rectangular isosceles trian...

- Sun Apr 05, 2015 12:15 pm UTC
- Forum: Mathematics
- Topic: function points
- Replies:
**35** - Views:
**6386**

### Re: function points

this is true (red is the change ) In a), you seem to want to consider all the points on the x-coordinate which are inside a certain distance (measured as |a- x |) from the point a =2. Your graph shows all the points with y = |2-x|. You mark y with an x because you really want to consider a 1-dimens...

- Sun Apr 05, 2015 11:35 am UTC
- Forum: Mathematics
- Topic: function points
- Replies:
**35** - Views:
**6386**

### Re: function points

I think I understand what you're saying in your last post. In a), you seem to want to consider all the points on the x-coordinate which are inside a certain distance (measured as |a-b|) from the point x=2. Your graph shows all the points with y>|2-x|. You mark y with an x because you really want to ...

- Wed Apr 01, 2015 3:27 pm UTC
- Forum: Science
- Topic: Miscellaneous Science Questions
- Replies:
**2904** - Views:
**676551**

### Re: Equivalence of Inertial Reference Frames valid?

Does that not contradict the velocity of light not being additive? If I am in a train traveling near light speed (assume the train has a vacuum inside so light is not slowed down), and I aim a flashlight against the opposite wall perpendicular to the motion of the train, shouldn't the light take a ...

- Sun Mar 29, 2015 10:05 pm UTC
- Forum: Science
- Topic: Miscellaneous Science Questions
- Replies:
**2904** - Views:
**676551**

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

The physical bedrock is that c is a constant in all frames. That is the only assumption you need to start. Linearity and the symmetries all follow. Your (3) is missing a - sign. The invariant length is s^2 = x^2 - c^2t^2. (You could make space - if you are on the west coast.) The algebraic properti...

- Sun Mar 29, 2015 4:17 pm UTC
- Forum: Science
- Topic: Miscellaneous Science Questions
- Replies:
**2904** - Views:
**676551**

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

That's kinda what I thought, but at the moment the connection is very vague for me. Maybe this is more a math question than a physics question. My background in linear algebra is not exactly rock-solid. Understanding more of the linear algebra would give you a better intuitive grasp of exactly why ...

- Sun Mar 29, 2015 3:44 pm UTC
- Forum: Science
- Topic: Miscellaneous Science Questions
- Replies:
**2904** - Views:
**676551**

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

Isn't 3 basically the starting point of special relativity? Light has the same speed in all frames? Yeah, it is the property that distinghishes a Lorentz boost from a classical one. The rest should be the same for classical changes of frame of reference, AFAIK(I could be wrong). And it seems like s...

- Sun Mar 29, 2015 1:21 pm UTC
- Forum: Science
- Topic: Miscellaneous Science Questions
- Replies:
**2904** - Views:
**676551**

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

I am learning special relativity by myself, and I'm trying to understand how the Lorentz transform works and is derived. I have read some derivation, but I think it's better if I manage to do it by myself. After banging my head some times, it turns out that I know how to derive the Lorentz boost on ...

- Tue Mar 24, 2015 9:28 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1502: “Wasted Time”
- Replies:
**21** - Views:
**5307**

### Re: 1502: “Wasted Time”

So we shouldn't ever do anything to make an activity more efficient, because we are not efficient 100% of the time? Is this what I'm supposed to be getting out of this? Or am I just overthinking it because I'm supposed to think "HAHA SO HILARIOUS". I think that the point of white-hat-guy ...

- Sun Mar 22, 2015 5:02 pm UTC
- Forum: Science
- Topic: Maxwell's demon -- consensus on disproofs?
- Replies:
**20** - Views:
**4743**

### Re: Maxwell's demon -- consensus on disproofs?

It has already been roundly established that a single sensor will be affected by thermodynamic fluctuations and thus be subject to numerous false alarms (note: if you disagree, let me know, but you seemed willing to accept this). Maxwell's demon doesn't need a perfect sensor, it only needs a sensor...

- Tue Mar 17, 2015 4:41 pm UTC
- Forum: Mathematics
- Topic: Pythagorean Triples
- Replies:
**2** - Views:
**1477**

### Re: Pythagorean Triples

The graph seems to revolve around Euclid's formula for primitive pythagorean triples: a triple a^2 + b^2 = c^2 is displayed centered at the coordinate (a,b). For any valid m and n you plug in, it spits out a unique pythagorean triples, and all of them can be specified like that. Proving that all tri...