On 21 Jan 2014, at 05:22, Richard Ruquist wrote:
The notion that computation produces information contradicts the
notion that information is conserved
made famous by the black hole paradox
http://en.wikipedia.org/wiki/Black_hole_information_paradox
"The evolution of the wave function is determined by a unitary
operator, and unitarity implies that information is conserved in the
quantum sense. This is the strictest form of determinism."
I wonder how that jives with MWI? Richard
It means that you survive, from your 1p view, even if falling in a
black hole. I doubt it could be a pleasant experience, though.
We will have to do a lot of work to prevent the human falling in a
black hole, when the Milky Way and Andromeda will collide. Hot gas and
Black Hole, we should avoid them.
Bruno
On Mon, Jan 20, 2014 at 10:04 PM, LizR <[email protected]> wrote:
A process which transforms information? Ultimately, digital
computation comes down to the NAND operation, I'm told, which means
it's a lot of "bit twiddling" which ultimately transforms one lots
of bits into another. I guess versions with non-binary data (like
DNA I assume?) can be reduced in principle to binary...
Not sure about the entropy definition. Since nothing reduces entropy
globally, I assume you mean only locally... Or at the cosmic scale?
The expansion of the universe supposedly reduces entropy, or makes
more states available to matter at least (I think it increases the
maximum available entropy, as per Beckenstein, rather than reducing
it).
Well, life does that, I guess, temporarily...
On 21 January 2014 09:17, Alberto G. Corona <[email protected]>
wrote:
Computation is understood as whatever made by a digital computer or
something that can be emulated (or aproximated) by a digital computer.
So everything is a computation. That is a useless definition. because
it embrace everything.
Everything is legoland because everything can be emulated using lego
pieces? No, my dear legologist.
What about this definition? Computation is whatever that reduces
entropy. In information terms, in the human context, computation is
whatever that reduces uncertainty producing useful information and
thus, in the environment of human society, a computer program is used
ultimately to get that information and reduce entropy, that is to
increase order in society, or at least for the human that uses it.
A simulation is an special case of the latter.
So there are things that are computations: what the living beings do
at the chemical, physiological or nervous levels (and rational, social
and technological level in case of humans) . But there are things that
are not computations: almost everything else.
--
Alberto.
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