Search found 422 matches

by lorb
Wed May 18, 2016 10:13 pm UTC
Forum: Mathematics
Topic: Is math real?
Replies: 105
Views: 16301

Re: Is math real?

Well, gravity being a force, it of course feels the same as any other force. You can run against a wall and feel basically the same as if you where falling onto the ground. The point is that this gives you a very clear sensory perception that there is a force which acts on your body. (Yes, technical...
by lorb
Wed May 18, 2016 8:21 pm UTC
Forum: Mathematics
Topic: Is math real?
Replies: 105
Views: 16301

Re: Is math real?

You cannot experience gravity with your senses. Stand up and jump. Did you feel something in your legs when you landed? What was that, if not gravity? In that regard even the medieval and ancient greek views where correct: there is something that makes things fall down. What Newton did was not disc...
by lorb
Wed May 18, 2016 12:00 pm UTC
Forum: Mathematics
Topic: Is math real?
Replies: 105
Views: 16301

Re: Is math real?

Of-course I don't adhere to this point of view. Not many people do... which doesn't stop the very same people from using a similar argument to claim that mathematics is "just a product of the human mind". And it is this inconsistency that bothers me. After all, we can see the effects of t...
by lorb
Tue May 17, 2016 9:59 pm UTC
Forum: Serious Business
Topic: energy currency?
Replies: 63
Views: 19191

Re: energy currency?

Also there is the really big technical problem that there really isn't any good system for storing huge amounts of energy/electricity. That is the reason it's so cheap at 3am: there is no way to put energy aside for a few hours and use it later. That's actually one of the things that makes pumped-st...
by lorb
Fri May 13, 2016 12:23 am UTC
Forum: School
Topic: Math without calculators
Replies: 33
Views: 21806

Re: Math without calculators

The quality of a schooling system really shouldn't be judged on the basis of how many hours a day a kid spends in school. Neither for good nor bad. Kid could be having an extremely productive day with supervised free-time that isn't spent on watching TV, or be forced to do stupid tasks all the time ...
by lorb
Fri May 13, 2016 12:13 am UTC
Forum: School
Topic: Help with a "research paper"
Replies: 16
Views: 10324

Re: Help with a "research paper"

That's a very resigned and cynical view. I had one awesome teacher for two years and although he made us read pretty advanced stuff that was sometimes hard to grasp I very much enjoyed it. He also would give good grades for dissent, if done well. But I understand that reading for school can suck too...
by lorb
Wed May 11, 2016 3:06 pm UTC
Forum: Religious Wars
Topic: One Firewall to Rule Them All
Replies: 3
Views: 6007

Re: One Firewall to Rule Them All

nftables++
by lorb
Sun May 08, 2016 9:41 pm UTC
Forum: Logic Puzzles
Topic: What is the last number (alphabetically)?
Replies: 12
Views: 4602

Re: What is the last number (alphabetically)?

But in that case the solution becomes "zero point [insert as many zeros as possible here] two" which any sane mathematician would simply just call epsilon. I thought epsilon was the function that enumerated the fixed points of α→ω α :P. Yes, but it's also common to use it for numbers ...
by lorb
Sun May 08, 2016 11:32 am UTC
Forum: Logic Puzzles
Topic: What is the last number (alphabetically)?
Replies: 12
Views: 4602

Re: What is the last number (alphabetically)?

What kind of numbers are allowed? The greek numeral for 7 is called zeta and it's also the name of some other numbers/constants (in physics mainly) And is "seven point eight" after "seven" alphabetically, for this puzzle? In dictionaries longer words are usually listed after the ...
by lorb
Sat May 07, 2016 10:40 pm UTC
Forum: Mathematics
Topic: Seating problem
Replies: 6
Views: 2520

Re: Seating problem

You can improve by assuming that one slot is fixed (one person never gets up). The table being in effect a circle loses one degree of freedom so you only have to search in the permutations of the nine other people.
by lorb
Thu May 05, 2016 11:33 am UTC
Forum: Gaming
Topic: Chess!
Replies: 86
Views: 22876

Re: Chess!

Apart from general time management, learn a few opening moves so you can play the first few moves without thinking and without taking any time. That will help with the time problem a little, and overall give you a better start.
by lorb
Wed May 04, 2016 3:40 pm UTC
Forum: Fictional Science
Topic: Could this planet exist?
Replies: 6
Views: 4505

Re: Could this planet exist?

How about, the water falls to the center of the planet, and after that some more because kinetic energy. The core of the planet is hot and warms the water to become steam, which than rises up the other half of the journey? Maybe the tunnel is far wider at the north half than at the south half to all...
by lorb
Tue May 03, 2016 7:04 pm UTC
Forum: Science
Topic: Dropping a Cloud Nine From Orbit
Replies: 38
Views: 6120

Re: Dropping a Cloud Nine From Orbit

I'd also vote for assemble on ground. As an alternative, maybe it can be assembled in situ? We already have balloons and zeppelins. We can make bigger and better versions of them and use them to lift the pieces of the cloud nine into the air where they are to be assembled. Once you are done with the...
by lorb
Mon May 02, 2016 5:21 pm UTC
Forum: Music
Topic: Any german symphonic metal band?
Replies: 7
Views: 8772

Re: Any german symphonic metal band?

Yeah, if you like the more dark metal/goth/doom stuff there is tons of them. You got ASP, Samsas Traum, Zeraphine, Letzte Instanz ... who all sing mainly in german. For some reason it is pretty uncommon to sing in german for the more power-/symphonic-metal bands. Try Equilibrium. Also many Nightwish...
by lorb
Sun May 01, 2016 9:27 pm UTC
Forum: Gaming
Topic: Chess!
Replies: 86
Views: 22876

Re: Chess!

Yeah, everyone blunders. Kramnik (one of the worlds top players) famously overlooked a mate-in-one in a man vs machine match. With no time pressure at all.
by lorb
Sat Apr 30, 2016 9:58 am UTC
Forum: Gaming
Topic: Chess!
Replies: 86
Views: 22876

Re: Chess!

Just had a game (I lost again :-() where I had the opportunity to take a knight, bishop, AND rook in exchange for a queen. I saw it, and decided against the exchange. Note to self: take the exchange next time. Aside from tactical/positional considerations it helps to know about the approximate rela...
by lorb
Sat Apr 30, 2016 12:34 am UTC
Forum: Gaming
Topic: Chess!
Replies: 86
Views: 22876

Re: Chess!

Tactics training can make you overly offensive. Most tactics exercises do not have the other side fight back and have real threats. But there is an easy way to compensate for that: after every move of your partner, before you even start thinking about your own moves, try to deduce what the idea/plan...
by lorb
Thu Apr 28, 2016 5:21 pm UTC
Forum: School
Topic: Help with a "research paper"
Replies: 16
Views: 10324

Re: Help with a "research paper"

Getting a student/annotated edition of the book will be very helpful. You have to use secondary sources anyway, so just do that :)
by lorb
Wed Apr 27, 2016 4:05 pm UTC
Forum: Forum Games
Topic: Countdown to one with Google!
Replies: 699
Views: 92099

Re: Countdown to one with Google!

Rhababerbarbarabarbarbarenbartbarbierbierbarbärbel - 564

next has to have at least 508
by lorb
Wed Apr 27, 2016 2:36 pm UTC
Forum: Science
Topic: How large a disc would it take to block a star from view for all of earth?
Replies: 26
Views: 5003

Re: How large a disc would it take to block a star from view for all of earth?

Even if it deviates by just a minuscule amount? If you put it in the right place and gave it a push in the right direction how fast would it deviate from the path we want? Or if one where to mount a rocket drive or something similar to the disc, how much energy would it take to keep it from intersec...
by lorb
Wed Apr 27, 2016 1:25 am UTC
Forum: Science
Topic: How large a disc would it take to block a star from view for all of earth?
Replies: 26
Views: 5003

Re: How large a disc would it take to block a star from view for all of earth?

gmalivuk wrote:And what do you propose to do about the fact that such an orbit intersects Earth's at two positions?


Does it absolutely have to? Could it not orbit on a plane perfectly parallel to earths but like 100000km away? (which is less than the distance the poles of jupiter have)
by lorb
Tue Apr 26, 2016 6:27 pm UTC
Forum: Science
Topic: How large a disc would it take to block a star from view for all of earth?
Replies: 26
Views: 5003

Re: How large a disc would it take to block a star from view for all of earth?

It would also heavily depend on which star you want to block out? Stars very close to the celestial poles could be shielded by a disc that has nearly the same orbit as earth just "above"/"below" it. And if you make the disc a little bigger than earth you have some leeway with it'...
by lorb
Wed Apr 20, 2016 2:13 pm UTC
Forum: Mathematics
Topic: Thesh Voting
Replies: 5
Views: 2080

Re: Thesh Voting

So we all know that first-past-the-post (the standard voting system in most countries, such as America) [...] That is a very US-centric view. Look at the map at Wikpedia . Most countries have some kind of proportional representation. edit: the proposed system also provokes strategic voting in the f...
by lorb
Sun Apr 17, 2016 11:03 am UTC
Forum: General
Topic: Origami and Mental Illness
Replies: 7
Views: 4202

Re: Origami and Mental Illness

Very nice! When my girlfriend of four years left me I was thinking about taking up smoking but instead started doing Origami. Way cheaper and healthier and a lot more interesting. I'm happy to see that you also get a lot of good from it. Especially the tiniest ones are also rather impressive.
by lorb
Sun Apr 10, 2016 2:09 pm UTC
Forum: Mathematics
Topic: Finding the Length of a Chord
Replies: 8
Views: 2204

Re: Finding the Length of a Chord

The problem is very clearly underdetermined. You have a triangle BCD that has no length given anywhere. The fact that it's right, and that its hypotenuse happens to be the chord of some circle gets you nowhere, because every line can be the chord of a lot of circles and there is nothing that makes t...
by lorb
Sat Apr 09, 2016 9:38 am UTC
Forum: What If?
Topic: What-If 0149: "Pizza Bird"
Replies: 57
Views: 19447

Re: What-If 0149: "Pizza Bird"

Isn't the drawing of the "mile-long mechanism" wrong? If the mechanism is attached to the plane it has the same speed and having the bird drop the pizza where it's drawn has the same problem as not using the mechanism at all. It would have to drop the pizza at the point closest to the plan...
by lorb
Fri Apr 08, 2016 11:20 am UTC
Forum: Logic Puzzles
Topic: Who can solve this???
Replies: 2
Views: 2878

Re: Who can solve this???

edwinthegreat wrote:Random Numbers And Letters


if they are random how can there be a solution?
by lorb
Thu Apr 07, 2016 4:29 pm UTC
Forum: News & Articles
Topic: Transgender in a single-sex school
Replies: 25
Views: 6244

Re: Transgender in a single-sex school

The paper literally calls the positive effect "trivial" because they are so small, and it also finds positive effects for coeducational schools. The effect sizes are really tiny both ways anyway and actually a little bigger for the positive effects of CE. So the takeaway is that there may ...
by lorb
Thu Apr 07, 2016 3:32 pm UTC
Forum: News & Articles
Topic: Transgender in a single-sex school
Replies: 25
Views: 6244

Re: Transgender in a single-sex school

The dramatic improvements in outcomes for both groups would strongly indicate otherwise. Don't exist. And vanish in those studies that found them if you control for other variables. There just is no "solid reasoning" to segregate education based on whatever theory of gender/sex you subscr...
by lorb
Thu Apr 07, 2016 2:36 pm UTC
Forum: News & Articles
Topic: Transgender in a single-sex school
Replies: 25
Views: 6244

Re: Transgender in a single-sex school

I kinda fail to see the point of segregating the schools if they're going to let the person stay anyways. You've kinda destroyed any solid reasoning as to why you segregated them in the first place. This idea of segregation is useless anyway. This. There just is no "solid reasoning" to se...
by lorb
Sun Apr 03, 2016 8:07 pm UTC
Forum: Science
Topic: square base cups
Replies: 24
Views: 5296

Re: square base cups

Do the square base ones have same base area as the circle ones? same circumference? something else?
by lorb
Sat Apr 02, 2016 12:41 pm UTC
Forum: Science
Topic: How Far Can A Person Walk Into The Desert?
Replies: 27
Views: 7693

Re: How Far Can A Person Walk Into The Desert?

Also one of the participants got lost in a sandstorm and ran about 300km in the wrong direction without much resupply. The little he had found on the way could easily be carried. It had some adverse health effects but he did recover and completed the marathon some years later. Source. Mauro Prosperi
by lorb
Sat Apr 02, 2016 1:01 am UTC
Forum: Science
Topic: How Far Can A Person Walk Into The Desert?
Replies: 27
Views: 7693

Re: How Far Can A Person Walk Into The Desert?

The amount of weight a person can transport across flat, level, well trod terrain is not optimized in a backpack. You can drag, wheel, etc significantly more. Consider the inverse of this scenario, arctic/antarctic expeditions. You've got a similar scenario, where resupply is mostly impractical. Gr...
by lorb
Thu Mar 31, 2016 12:02 am UTC
Forum: Science
Topic: Engines big enough....
Replies: 28
Views: 5479

Re: Engines big enough....

You are right. I underestimated human energy output a lot. I retract my claim that it is the most doable and best or fastest way. It is possible (at current technological level) but looking at either the cost or the time it takes to achieve a meaningful result there are better ways. Still not convin...
by lorb
Wed Mar 30, 2016 11:25 pm UTC
Forum: Science
Topic: Engines big enough....
Replies: 28
Views: 5479

Re: Engines big enough....

Already said it really depends on how hard humanity wants to do this. The energy is already there. Just use 1% of all the energy humanity is generating, pump it into a lot of space guns for a few decades. Done.
by lorb
Wed Mar 30, 2016 10:18 pm UTC
Forum: Science
Topic: Engines big enough....
Replies: 28
Views: 5479

Re: Engines big enough....

No, it's extremely un-doable. The gun is economically impossible to build at a scale big enough to move the Earth. One gun for sure. But it is extremely doable to build many guns that fire a payload of say 100kg into space. The reasons SHARP/HARP didn't get more funding and weren't continued are th...
by lorb
Mon Mar 28, 2016 11:03 pm UTC
Forum: Science
Topic: Engines big enough....
Replies: 28
Views: 5479

Re: Engines big enough....

- really, look at existing HARP/SHARP issues and then realize that the whole thing will require hitting escape velocity while going straight up. How much payload *isn't* going to be vaporized by hitting the atmosphere at such a speed. And even using nukes, you are still likely to have gas velocity ...
by lorb
Sat Mar 26, 2016 1:44 pm UTC
Forum: Science
Topic: Engines big enough....
Replies: 28
Views: 5479

Re: Engines big enough....

With current technology your best bet is very likely to just shoot stuff into space. Look into HARP and SHARP They mostly lack funding, but the concept and the science is pretty well established and if you don't really care for the stuff you are shooting (contrary to the original goal of satellite l...
by lorb
Sat Mar 26, 2016 1:14 pm UTC
Forum: Mathematics
Topic: Math without even numbers?
Replies: 40
Views: 8973

Re: Math without even numbers?

0 is odd. It definitely isn't. If one can define math to only have odd numbers, 0 surely can be defined to be odd. Or going the other way round: the symbol "0" represents the neutral element in respect to addition, so while that may be -1 in the notation of regular math, in the proposed s...
by lorb
Thu Mar 17, 2016 1:15 pm UTC
Forum: Science
Topic: List of All Laws of Nature
Replies: 199
Views: 38358

Re: List of All Laws of Nature

Just like economics, they are looking for statistical laws and completely avoiding other methods of science - [...] Misesian economics (the Austrian School) states that economics should be developed just like geometry, by deduction from axioms, and not by collecting data and searching for statistic...

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