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saturday savior
Topic Started: Jan 28 2017, 12:17 PM (363 Views)
ragnarokio
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not many aspects of the universe are infinite

there is a finite amount of mass in the universe, otherwise gravity wouldn't work, among other things.

the mass is within a finite distance of each other, otherwise gravity wouldn't work, among other things.

that means the universe can be described by the outer bounds of that mass

there is also the event horizon, which describes the distance light has travelled from the centre of the universe. I don't know if mass exists outside the event horizon.

space is infinite in the sense that you can theoretically displace mass along any axis forever.
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ragnarokio
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but again, i don't actually know much about physics
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pantsukun
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http://www.universetoday.com/119553/is-the-universe-finite-or-infinite/

frasier cain not crane
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pantsukun
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tru like if the universe is expanding is it into infinite space or is space itself the thing which is expanding
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ragnarokio
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i had not considered the idea that space could loop
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ragnarokio
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pantsukun
Jan 28 2017, 01:32 PM
tru like if the universe is expanding is it into infinite space or is space itself the thing which is expanding
that probably comes down to semantics

things are travelling further, in all directions. light is constantly moving further and further away from the centre of the universe, and so the event horizon, and the size of the observable universe, is increasing in that sense.

There's also some other cosmic expansion mechanic that I don't really understand. I think that on the smallest scales, things are moving apart from each other. You could probably describe that kind of phenomenon as "space itself expanding", but the end result is still that things are still just getting further away from each other.
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pantsukun
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oh yeh i suppose that since nothing travels faster than light nothing would b able to make it to the edge of the universe anyway

also it is called "universe today" but the sidebar only lists the planets of the solar system this is parochialism at its finest
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ragnarokio
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chess AIs can beat humans because they have superior reading abilities. They can read further ahead and consider more moves than humans can. Humans currently beat them in the ability to quickly discern which moves are most valuable to think about, but its not as if AIs can't do that either.

AIs don't just play against humans, they also play against each other, and in order for an AI to beat another AI with similar reading power, it needs to use that power more smartly than the other AI.

The same is true of go, and google's deepmind is exceptional in that it is a significant leap in the ability to use its reading power efficiently over the previous generation of AIs. I'm guessing its still far behind humans though, since it lost a game to lee sedol despite completely dwarfing him in reading power.

when I said brute forcing chess is probably impossible i meant solving it via brute-force, though.

https://xkcd.com/832/

here's a pretty brute-force solution to tic-tac-toe by xkcd. Using a similar method to map out every possible move in chess is probably physically impossible.
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pantsukun
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whoa all those little fractal tic tac toe board things dang i would not want to b the person in charge of drawing a similar chart for chess

i think i kinda kno what u are talking about and it seems like chess would b a lot easier to brute force than go but still very difficult

i wish there was more hype things of computers vs humans where millions of ppl are watching scheduled for the future
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ragnarokio
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but chess can be brute-forced given enough computing power. It just might not be possible to have that much computing power even with the biggest, most efficient computer that is possible to construct using all of the material available in the universe.

I also don't know if you can come up with a solution to chess with any computer given enough time. It would come down to the kind of algorithm you're using to brute force it. Its possible that any computer trying to find a solution would need to be able to hold the entireity of the game in its "mind" at once, which means that size would be a limiting factor even with infinite time.
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