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Luís F. Simões

Polynomial Time Code For 3-SAT Released, P==NP - Slashdot - 0 views

  • "Vladimir Romanov has released what he claims is a polynomial-time algorithm for solving 3-SAT. Because 3-SAT is NP-complete, this would imply that P==NP. While there's still good reason to be skeptical that this is, in fact, true, he's made source code available and appears decidedly more serious than most of the people attempting to prove that P==NP or P!=NP. Even though this is probably wrong, just based on the sheer number of prior failures, it seems more likely to lead to new discoveries than most. Note that there are already algorithms to solve 3-SAT, including one that runs in time (4/3)^n and succeeds with high probability. Incidentally, this wouldn't necessarily imply that encryption is worthless: it may still be too slow to be practical."
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    here we go again...
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    slashdot: "Russian computer scientist Vladimir Romanov has conceded that his previously published solution to the '3 SAT' problem of boolean algebra does not work."
Francesco Biscani

Claimed Proof That P != NP - 4 views

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    Yet another one? Wish him good luck... I doubt anyone will waste time peer-reviewing his article. Here's quite a nice overview of the efforts on the problem: http://www.win.tue.nl/~gwoegi/P-versus-NP.htm
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    thanks Marek - very nice link indeed ... did not know about it
LeopoldS

Scientists test novel power system for space travel (w/ video) - 1 views

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    Less impressive than the headline, since they actually just tested their conversion system at suboptimal conditions on an existing reactor setup, but still since done within six month and with less than 1M€ ...
LeopoldS

Finding the Source of the Pioneer Anomaly - IEEE Spectrum - 0 views

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    The article came out some time ago of course and was posted here, though the story here is still well written. If you are lazy to read the rel long article, here the summary explanation: The team found that a good half of the force came from heat from the RTGs, which bounced off the back of the spacecraft antenna. The other half came from electrical heat from circuitry in the heart of the spacecraft. Most of that heat was radiated through louvers at the back of the probes, which weren't as well insulated as the rest of their bodies, further contributing to the deceleration.
tvinko

Travelling Salesman movie - 4 views

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    related conspiracy: politicians know that P=NP but they do not let us know the proof
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    did you put money on this? I would love to see it :)
LeopoldS

NPS CUBESAT LAUNCHER DESIGN, PROCESS AND REQUIREMENTS - 2 views

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    Interesting mater thesis that lead to the just announced new launcher ! Remember our discussion after the advanced concepts workshop!?!?!
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    do you know about this? https://www.qb50.eu/launch.php
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    I knew about the project only, but not about this very interesting missile ... "The launcher has a remarkable track record of several hundred successful launches and only 1 failure. Shtil is marketed by the State Rocket Center Makeyev."
LeopoldS

Nuclear powered drones? - 2 views

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    Not explicit but smells like RTGs
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    "The effort contrasted and compared eight heat sources technologies, three power conversion, two dual cycle propulsion system configurations, and a single electrical power generation scheme." Yes, it's about RTGs, at least partially.
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    The quote "it was disappointing to all that the political realities would not allow use of the results" may refer to RTGs too :-)
LeopoldS

Physical Review Letters - Extracting dynamical equations from experimental data is NP hard - 1 views

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    Something for Sante and Luis...
Francesco Biscani

YouTube - Hitler and P = NP - 2 views

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    It was inevitable...
Ma Ru

P vs NP - 2 views

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    For non-computer scientists who ever wondered what is this thing that computer scientists keep babbling about after a few beers (apart from MtG)... Relatively correctly explained in this article.
ESA ACT

A Sound Way To Turn Heat Into Electricity - 0 views

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    another energy conversion system... could be very interesting for nuclear power sources and other fields. more details in a few days
Joris _

Video: Seagull Robot Takes Off And Flies On Its Own, Just Like the Real Thing | Popular... - 5 views

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    Awesome, they managed. (this is a different deal as the micro ones )
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    haha, just what they need in holland ;) anyway this is impressive !
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    really nice - must not be that easy to control, correct?
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    when we tried (http://cas.ensmp.fr/~petit/site-oiseau-np/main.htm good old time :) ) the kinematic and mechanics were the big issues.
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    this looks like a very nice project back in 2005 ...
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    Does it also attack people to capture their fish & chips like those beasts we have here in St. Ives?
LeopoldS

Russia reveals a formidable nuclear-powered space tug - 0 views

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    after many announcements, now some first design drawings ...
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