zzazzdsa

4 ms·

1.
by zzazzdsa 4mo ago
I won with 1. e4 e5 2. Qh5 a6 3.Bc4 a5 4. Qxf7#. I wonder if you could implement a stronger engine in regex (stockfish classic at O(1) nodes is plenty strong already)
2.
by zzazzdsa 2y ago
The momentum analogue for Langevin is known as underdamped Langevin, which if you optimize the discretization scheme hard enough, converges faster than ordinary Langevin. As for your question, your guess is as good as mine, but I would gues
3.
by zzazzdsa 2y ago
Does this really require stochastic calculus to prove? This should just be a standard integration, based on the fact that the expected number of samples required for fixed A being 1/(1-A).
4.
by zzazzdsa 9y ago
To be fair, CS theory is basically just mathematics :)
5.
by zzazzdsa 9y ago
2 to the billion is still constant....
6.
by zzazzdsa 9y ago
Yep, Whink brand rust remover is 4% HF. It's a somewhat useful source of hydrofluoric acid in a pinch. I recall a procedure for making uranium tetrafluoride from uranium trioxide (which in turn was extracted from uranium ore) using tha
7.
by zzazzdsa 9y ago
For a specific example of something like this being important, remember the (very impressive) Watch for Rolling Rocks in 0.5 A presses video from a couple years ago? https://www.youtube.com/watch?v=kpk2tdsPh0A (For the unin
8.
by zzazzdsa 9y ago
We had plenty of evidence that a deterministic primality testing algorithm exists, though. The Miller-Rabin test was known to be randomized polynomial time since the 70s, and assuming the generalized Riemann hypothesis it can be made determ
9.
by zzazzdsa 9y ago
Magnesium will only burn when heated to near its melting point of ~400 C, and thermite can only be set off at temperatures that would melt aluminum. Shipping them together is not an issue, unless the aluminum and iron oxide are freely dispe
10.
by zzazzdsa 9y ago
From a practical point of view, the only semi-common thermites that can actually explode are copper and silver. However, these thermites do not "detonate" as in the definition. They merely deflagrate extremely quickly, quickly eno
11.
by zzazzdsa 9y ago
Alternatively, the three components for gunpowder can be bought very cheaply and nigh-untraceably from hardware stores: potassium nitrate is stump remover, sulfur is used to reduce the pH of soils for gardening, and charcoal can be made fro
12.
by zzazzdsa 9y ago
Guns aren't a major industrial commodity chemical with hundreds if not thousands of valid non-violent civil uses, however...
13.
by zzazzdsa 9y ago
Potentially, but the neutralization of sulfuric acid releases a ton of heat (sometimes enough to crack glassware). By neutralizing the sulfuric acid without giving the heat anywhere to dissipate, you might just end up making things worse. A
14.
by zzazzdsa 9y ago
Yep, that server is indeed still at Stanford. It is now in the basement of the Huang building in the engineering quad.
15.
by zzazzdsa 9y ago
Well, pH refers to the concentration of protons in water solvent. Since pure sulfuric acid has no water (excluding that which is in equilibrium with sulfur trioxide), pH isn't really well defined for it. A better definition of acidity
16.
by zzazzdsa 9y ago
Conway showed that the generalized Collatz conjecture (recurrences with arbitrary cases dependent on the modulus) is computationally undecidable (halting problem reduces to it). The choice of modulus doesn't even need to be that big to
17.
by zzazzdsa 9y ago
Then again, both have something to do with bugs on some level...
18.
by zzazzdsa 9y ago
The thing with these substances is that although these substances are best known for their psychological effects, they may also have some medically useful effects for somatic disorders. For example, some of the psychedelic phenethylamines a
19.
by zzazzdsa 9y ago
Unless my understanding of things is wrong, I'm pretty sure that unless the strong exponential time hypothesis (essentially, n variable CNF-SAT takes O(2^n) time in the worst case) is false, no diff algorithm can run in subquadratic ti
20.
by zzazzdsa 10y ago
When mixed with sulfuric acid, it forms manganese heptoxide, which does lovely things like ignite paper on contact and detonate if heated above 50 C!
21.
by zzazzdsa 10y ago
A lot of the posts here seem to be missing something important: permanganate is an EXTREMELY vividly colored ion in solution. The bright colors of the water in the pictures is about in line with what a 20 ppm permanganate solution looks lik
22.
by zzazzdsa 10y ago
For what it's worth, permanganate is an extremely strong oxidizer (probably the second strongest stable solid oxidant known, after persulfate), but at neutral pH it is unable to oxidize chloride to hypochlorite and beyond. (The electro
23.
by zzazzdsa 10y ago
A good game to test this on is http://www.chessgames.com/perl/chessgame?gid=1139126 . Tal played the move 19. Rf6!!, which instantly wins the game. However, (at least when I tested this a few months ago), Stockfish tak
24.
by zzazzdsa 10y ago
There's a pretty easy proof to show why compression of truly random data is impossible. Let C be a compression algorithm. Assume that for all bit strings S, C(S) is not longer than S, and assume that there exists strings S' such t
25.
by zzazzdsa 10y ago
Yeah, as of a month ago he works at Google. Source: current Stanford PhD student
26.
by zzazzdsa 10y ago
If you're still curious, Firefox for android has full support for all of the desktop extensions, including uBlock.
27.
by zzazzdsa 10y ago
Overall abundance of an element in the earth's crust doesn't mean as much as you'd think -- for example the element scandium is even more common than lead in the crust (20 ppm) and is a dream metal both in bulk and as a stren
28.
by zzazzdsa 10y ago
There's a more fundamental issue here-- when talking about approximation algorithms reductions don't necessarily preserve approximation ratios. If you take a standard TSP instance with optimal tour length C and add the largest dis
29.
by zzazzdsa 10y ago
Sure thing. Mind if we start with you? /s
30.
by zzazzdsa 11y ago
or Cargill, or Mars....

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