Search found 2058 matches

by jaap
Thu Sep 07, 2017 1:13 pm UTC
Forum: News & Articles
Topic: Bedfordshire Professor Claims Voynich Breakthrough
Replies: 9
Views: 5348

Re: Bedfordshire Professor Claims Voynich Breakthrough

**BUMP**

Another reasonably convincing interpretation:
https://www.the-tls.co.uk/articles/publ ... -solution/
by jaap
Wed Sep 06, 2017 5:55 am UTC
Forum: Logic Puzzles
Topic: 538 hats riddle
Replies: 20
Views: 1835

Re: 538 hats riddle

With 7 people you can use two rules. Rule one - If you see four people with the same color, then you must guess that you have the opposite color. Win - 70/128 Lose - 42/128 Rule two - If you see six people with the same color, then you must guess that you have the opposite color Win - 14/128 Lose -...
by jaap
Mon Sep 04, 2017 3:14 pm UTC
Forum: Logic Puzzles
Topic: 538 hats riddle
Replies: 20
Views: 1835

Re: 538 hats riddle

It is not stated clearly in the question, but I assume that each hat's colour is chosen independently, 50:50 either colour. What you say is true if you make a fixed choice beforehand about who is going make a guess. However, you don't have to do that. For example, consider the smaller version of the...
by jaap
Sat Sep 02, 2017 1:59 pm UTC
Forum: Language/Linguistics
Topic: Miscellaneous language questions
Replies: 481
Views: 45250

Re: Miscellaneous language questions

Maybe at some point the y spelling had dots added because as I wrote before the letter y is not used much normally. In cursive handwriting the ij is essentially identical to y apart from the dots, and it is very hard to resist the urge to automatically add them. That is really interesting. Is this ...
by jaap
Sat Sep 02, 2017 11:53 am UTC
Forum: Language/Linguistics
Topic: Miscellaneous language questions
Replies: 481
Views: 45250

Re: Miscellaneous language questions

Non-English 26ers include Dutch (Ij directly replacing Y, it seems, a detail to which I would clearly defer to any Dutch forumite who cared to comment) I'm Dutch, so let me wade in here about the Dutch "IJ". It represents a vowel sound, one of the many diphthongs spoken Dutch has. It is n...
by jaap
Fri Sep 01, 2017 2:27 pm UTC
Forum: Mathematics
Topic: Possible "Spot it!"-like decks
Replies: 30
Views: 3158

Re: Possible "Spot it!"-like decks

See I thought that when you made cards like these it was what he was asking about. I thought these worked, Meets all his conditions. 1376524 1745632 1234567 1472635 1563472 1625743 All your cards have the same symbols. We don't care about their order on each card, so every pair of cards in your set...
by jaap
Thu Aug 31, 2017 9:40 am UTC
Forum: Language/Linguistics
Topic: Miscellaneous language questions
Replies: 481
Views: 45250

Re: Miscellaneous language questions

Non-English 26ers include Dutch (Ij directly replacing Y, it seems, a detail to which I would clearly defer to any Dutch forumite who cared to comment) I'm Dutch, so let me wade in here about the Dutch "IJ". It represents a vowel sound, one of the many diphthongs spoken Dutch has. It is n...
by jaap
Wed Jul 26, 2017 12:06 pm UTC
Forum: Mathematics
Topic: Determining line of sight over time
Replies: 30
Views: 2936

Re: Determining line of sight over time

By the way, having the observers moving instead of stationary does not change the difficulty of this question. Are you dropping the implicit assumption that the objects in the space are stationary? I guess so, because I never really thought of the objects as stationary. *since the line end points r...
by jaap
Wed Jul 26, 2017 5:21 am UTC
Forum: Mathematics
Topic: Determining line of sight over time
Replies: 30
Views: 2936

Re: Determining line of sight over time

Sure. I'm trying to understand the point? Do you think her/his problem is solvable? The OP is not clear: If both points are stationary is it trivial to determine whether or not they can see each other. However, both points are moving. As you said, and I agree, that part is still essentially trivial...
by jaap
Tue Jul 25, 2017 2:40 pm UTC
Forum: Mathematics
Topic: Determining line of sight over time
Replies: 30
Views: 2936

Re: Determining line of sight over time

There are two points in a space. The space is filled with objects. If both points are stationary is it trivial to determine whether or not they can see each other. However, both points are moving. Luckily, they are moving in straight lines with a constant speed. How would I go about determining at ...
by jaap
Mon Jul 24, 2017 11:57 am UTC
Forum: Logic Puzzles
Topic: Arithmetic puzzle
Replies: 5
Views: 2361

Re: Arithmetic puzzle

It is not possible.

For n>1 we have:
log n! < log nn = n log n < n2

So n! always has fewer than n2 digits (except for 1! and 0!).
by jaap
Fri Jul 21, 2017 12:28 pm UTC
Forum: Logic Puzzles
Topic: Isosceles triangles and circles : puzzle connection
Replies: 15
Views: 1501

Re: Isosceles triangles and circles : puzzle connection

Read what was written in the picture : "At right you have samples of isosceles triangles connecting three circles" Is there any precision about right triangle or not? no. So triangles could be right or not. Just watch carefully my examples : you have right triangles and not right triangle...
by jaap
Sun Jul 16, 2017 5:27 pm UTC
Forum: Movies and TV Shows
Topic: Doctor Whom
Replies: 4894
Views: 558901

Re: Doctor Whom

charliepanayi wrote:We have a female Doctor

Jodie Whittaker
by jaap
Fri Jul 07, 2017 7:52 am UTC
Forum: Language/Linguistics
Topic: How to write in plain language
Replies: 32
Views: 2439

Re: How to write in plain language

Are you getting that 20 words/sentence average from your personal digital copy? I admit that is an awful lot. On the other hand, by Shane Snow's calculations , Hemingway's books have an overall Flesch-Kincaid reading level of 4, and reading ease of a startling 95. So clearly it matters which metric...
by jaap
Sun Jul 02, 2017 1:24 pm UTC
Forum: Language/Linguistics
Topic: Regional Dialect and Idiolect Oddities (pronunciation)
Replies: 794
Views: 182602

Re: Regional Dialect and Idiolect Oddities (pronunciation)

Question: Here in the US decimal numbers are written with a "decimal point " as e.g. 3.14, which is said out loud as "three point one four". I know that in some (many?) other countries decimals are written using a comma as 3,14. In this case how is the number said out loud? Is i...
by jaap
Sat May 27, 2017 5:29 am UTC
Forum: Language/Linguistics
Topic: “good big”
Replies: 7
Views: 1457

Re: “good big”

See also this language log post. It mentions some examples where the most common word order defies categorization, e.g. "ugly little"/"big ugly".
by jaap
Tue May 02, 2017 2:57 pm UTC
Forum: Mathematics
Topic: Halting Problem
Replies: 200
Views: 12670

Re: Halting Problem

This what I don't understand - my assumption (perhaps mistaken) is that the Oracle program must have the last move (i.e., it must say that whatever's been fed to it will halt or that what's been fed to it will loop forever). Is that assumption incorrect? That is correct. If you had a perfect Oracle...
by jaap
Thu Apr 27, 2017 7:22 am UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9738
Views: 1550294

Re: Coding: Fleeting Thoughts

Microsoft Powerpoint is Turing complete:
https://www.youtube.com/watch?v=uNjxe8ShM-8
by jaap
Wed Apr 12, 2017 12:24 pm UTC
Forum: Logic Puzzles
Topic: Two secrets
Replies: 20
Views: 4438

Re: Two secrets

I think I have an O(log(N)) solution. Let A initially be {1, 2, 3, ..., N-1}. At all times, we know that at least one of the numbers is in A. Divide A into three roughly equal sets A 1 , A 2 , and A 3 , and ask about A 1 ∪ A 2 , A 1 ∪ A 3 , and A 2 ∪ A 3 . If we get a "yes" response to on...
by jaap
Mon Apr 10, 2017 2:11 pm UTC
Forum: Science
Topic: Does the geographical distribution of the northern and southern hemispheres affect the rotation of the Earth?
Replies: 8
Views: 1636

Re: Does the geographical distribution of the northern and southern hemispheres affect the rotation of the Earth?

Is the biggest effect to do with moving closer/further from the poles, thereby moving mass closer/further from the axis, and changing the moment of inertia?
by jaap
Thu Mar 30, 2017 9:23 am UTC
Forum: Mathematics
Topic: Futurama Puzzle Game
Replies: 5
Views: 2050

Re: Futurama Puzzle Game

That is an interesting question. Of course, in the episode the problem was fixed by adding two people who hadn't swapped yet, which adds enough available swaps to always make it solvable. It looks like there's some parity rule that forces complete paths to have an even number of steps, but I'm not s...
by jaap
Mon Mar 06, 2017 12:42 pm UTC
Forum: Science
Topic: How can we experminetly determine the acceleration due to gravity?
Replies: 20
Views: 3007

Re: How can we experminetly determine the acceleration due to gravity?

But for an object rolling without slipping, some of the gravitational potential energy is transformed into rotational energy. If I do the calculations right, the proportion depends on the ratio of the moment of inertia of the object and the product of its mass and the square of its rolling radius, ...
by jaap
Thu Mar 02, 2017 9:35 am UTC
Forum: Logic Puzzles
Topic: Escape the Frictionless Circle
Replies: 146
Views: 28778

Re: Escape the Frictionless Circle

LaserGuy wrote:If you fall outward,

That's a big if. How do you fall outward if your feet slide inward?
by jaap
Thu Feb 02, 2017 3:26 pm UTC
Forum: Science
Topic: Coincidence in Tycho's Model of the Solar System
Replies: 6
Views: 1971

Re: Coincidence in Tycho's Model of the Solar System

The model in that video is not to scale. The gaps between the orbits of neighbouring planets in that video are all the same, whereas in actuality the distances increase further out. Because the video uses equal distances, you will get such apparent coincidences as it makes sixth planet exactly twice...
by jaap
Wed Feb 01, 2017 4:22 pm UTC
Forum: Science
Topic: Newton's shell theorem with negative mass
Replies: 12
Views: 2277

Re: Newton's shell theorem with negative mass

I actually did my doctoral dissertation on negative mass, but mostly on cosmological scales. A matched pair of positive and negative mass particles would indeed accelerate forever. This doesn't violate conservation of energy, since the negative mass has negative kinetic energy. Generalizing, a gas ...
by jaap
Mon Jan 30, 2017 1:23 pm UTC
Forum: Science
Topic: Explosions and Unobtainium, as pertains to video game physics
Replies: 9
Views: 2082

Re: Explosions and Unobtainium, as pertains to video game physics

Here's another data point. The Mythbusters tested a scene from Lethal Weapon 2: https://en.wikipedia.org/wiki/MythBusters_(2011_season)#Episode_178_.E2.80.93_.22Toilet_Bomb.22 It turns out that that a rather heavy metal bathtub can protect you from a blast that would otherwise have been lethal (180 ...
by jaap
Wed Jan 11, 2017 4:44 pm UTC
Forum: Movies and TV Shows
Topic: Star Wars Episode VIII naming contest
Replies: 35
Views: 5120

Re: Star Wars Episode VIII naming contest

Just for larfs... What is your guess about what Episode VIII will be called? I'll lay down The Ways Of The Force I think they'll want to give a three-act structure to the new trilogy, so the middle film needs to be a slightly darker one where the Empire New Order strikes back. The title will probab...
by jaap
Tue Dec 13, 2016 4:44 pm UTC
Forum: Logic Puzzles
Topic: Word Puzzle.
Replies: 6
Views: 2761

Re: Word Puzzle.

I don't think so. A quick google for "reversible words" led me to this page . I then filtered out all the ones that are not 3 letters long, and removed eel/lee due to the repeated letter. The remaining words are almost all consonant/vowel/consonant, except for: are/era ate/eta bro/orb So i...
by jaap
Sun Dec 04, 2016 12:49 pm UTC
Forum: Language/Linguistics
Topic: Simple Writer poetry for the Holiday Season
Replies: 11
Views: 3789

Re: Simple Writer poetry for the Holiday Season

If I interpret your post correctly, you don't know the mechanism of how Simple Writer works in its way of changing certain input words into red fronts. I should be grateful, if some other readers of this thread could help me to learn that mechanism. The xkcd simplewriter page seems to use the javas...
by jaap
Wed Nov 16, 2016 7:01 am UTC
Forum: Science
Topic: V=IR - bad science or am I being thick?
Replies: 15
Views: 3314

Re: V=IR - bad science or am I being thick?

The further you go to the top-left, the more reactive the elements are. Clarification: metals in the lower left are more reactive than those in the upper left. Lithium in water will fizz around enthusiastically; sodium will ignite, and it gets more exciting from potassium on down. (Francium is too ...
by jaap
Sat Oct 22, 2016 4:39 pm UTC
Forum: Mathematics
Topic: Primes under different moduli
Replies: 4
Views: 1862

Re: Primes under different moduli

So I think it was this forum where I originally learned that all primes above 3 are of the form 6k+1 or 6k+5, meaning that if you want to search for primes, you can do so 3x as efficiently as searching evey single integer. However, I'm curious about whethere there is a value better than 6 to use th...
by jaap
Mon Oct 10, 2016 2:12 pm UTC
Forum: Science
Topic: V=IR - bad science or am I being thick?
Replies: 15
Views: 3314

Re: V=IR - bad science or am I being thick?

In this article: https://www.theguardian.com/technology/2016/oct/10/samsung-how-batteries-work-smartphones-explode there is the following statement: The higher the resistance the harder the battery has to work to maintain a usable voltage and so the amount of power it can produce per charge decreas...
by jaap
Tue Oct 04, 2016 5:51 pm UTC
Forum: Logic Puzzles
Topic: Maya Cosmic Number Puzzles
Replies: 5
Views: 2961

Re: Maya Cosmic Number Puzzles

I used pen & paper. Although each step in the solve was easy, those steps are hard to spot. I needed to make lots of annotations, and it is easy to make so many that it becomes a big unreadable mess. 00 35 63 21 56 14 42 53 11 46 04 32 60 25 36 64 22 50 15 43 01 12 40 05 33 61 26 54 65 23 51 16 ...
by jaap
Tue Oct 04, 2016 8:51 am UTC
Forum: Language/Linguistics
Topic: Why are some linguistic patterns irritating?
Replies: 59
Views: 9138

Re: Why are some linguistic patterns irritating?

Angua wrote:Which word has the wrong spelling? Chomping seems to be right to me, and bit seems to be the right word for that part of the bridle...

And horses definitely do chomp on the thing.

Apparently it used to be champing at the bit, and some people insist it still is.
by jaap
Mon Sep 19, 2016 7:28 am UTC
Forum: Language/Linguistics
Topic: Think Before Naming Your Child
Replies: 1622
Views: 279368

Re: Think Before Naming Your Child

Apparently in 1974, people in the U.S. named over 280 baby girls "Latrina". Numbers were still pretty high through the 70s before falling off, though it's possible they are creeping back up. What a terrible name. Did you happen to see the same episode of TripTank as I did last night? Or i...
by jaap
Thu Sep 01, 2016 4:34 pm UTC
Forum: Mathematics
Topic: How to Calculate Pi without a Calculator?
Replies: 66
Views: 8475

Re: How to Calculate Pi without a Calculator?

Yeah, I'm on my phone (and was between classes at that point), so it would be faster for you to just google "square root long division algorithm" than for me to do it and then go to the resulting page, copy the url, and try to paste it here (I say "try" because my phone often ha...
by jaap
Wed Aug 31, 2016 12:15 pm UTC
Forum: Language/Linguistics
Topic: Annoying words, and Words You Hate
Replies: 1931
Views: 363369

Re: Annoying words, and Words You Hate

Well, it's similar to the recent construction in "Internet speak", where people will deliberately ungrammatically drop everything between "because" and the important noun/gerund/adjective they're referring to: "Stopped for an extra coffee and doughnut before work. Because M...
by jaap
Tue Aug 30, 2016 8:17 am UTC
Forum: Science
Topic: What is the Biggest Non-Repeating Molecule?
Replies: 39
Views: 6358

Re: What is the Biggest Non-Repeating Molecule?

Rotational symmetry does not prevent a crystal from being aperiodic. Periodicity is essentially just translational symmetry. After all, a helium atom is highly rotationally symmetric, but I wouldn't call it "periodic." Your right; that was my mistake. However, a picture of the cross-secti...
by jaap
Mon Aug 29, 2016 3:01 pm UTC
Forum: Mathematics
Topic: How to Calculate Pi without a Calculator?
Replies: 66
Views: 8475

Re: How to Calculate Pi without a Calculator?

Example calculation of sqrt 3: Guess 2. Divide into 3: 3/2 = 1.5 Average the two: (2 + 1.5)/2 = 1.75 Guess 1.75 Divide into 3: 3/1.75 = 1.714286571 Average the two: (1.75 + 1.714286571)/2 = 1.732428571 Guess 1.732428571. Divide into 3: 3/1.732428571 = 1.731673165 Average = 1.732079418 Iterate until...
by jaap
Sun Aug 28, 2016 3:41 pm UTC
Forum: Mathematics
Topic: Goahead52's Math Posts
Replies: 148
Views: 12028

Re: Goahead52's Math Posts

The formula you found should be: (7-1)*(1+7 2 +7 4 +...+7 2k ) is always a triangular number for any k This is true, because: Using the formula for summing geometric series, this number is S = (7-1)*(1+7 2 +7 4 +...+7 2k ) = 6*(7 2(k+1) -1)/(7 2 -1) = 6*(7...

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