log☇︎
109000+ entries in 0.065s
a111: Logged on 2018-04-12 20:55 asciilifeform: spyked: in re proof machines, i'm much moar interested in items like ACL2 , where you can affix your hand-written program to a hand-written proof of correctness in a mechanically-reliable way
mircea_popescu: http://btcbase.org/log/2018-04-12#1797814 << this'd be the one extra item vtronics might eventually get, if this ever comes to exist in a proper sense. ☝︎
a111: Logged on 2014-02-26 14:52 mircea_popescu: they let it run overnight, among the conclusions it had arrived to by morning was "napoleon had an infinite number of arms"
a111: Logged on 2018-04-12 20:48 asciilifeform: spyked: if you recall, back in the 'minsky age', that was the initial attraction of mechanical 'reasoners' -- discovery of ~simple~ inferences
mircea_popescu: btw, does it occur to anyone else that #trilema is way ahead of i dunno, black-chicks-code or whatever other imperial nonsense in terms of both headcount, volume or value of female participation in techgeneering ?
mircea_popescu: http://btcbase.org/log/2018-04-12#1797781 << aww, dese women in tech. ☝︎
a111: Logged on 2018-04-12 19:42 avgjoe: no, it's a easy/fake study to have more spare time keeping government grants
mircea_popescu: http://btcbase.org/log/2018-04-12#1797734 << hey. he has a point there, if you're gonna bilk it gotta bilk it. ☝︎
mircea_popescu: zx2c4 specifically for the "empty room" problem he brought up. do you follow the logic there ?
mircea_popescu: !!up TrixxC
trinque: kittycollector and sashahsas, you used the same address. someone is lazy.
lobbes: technical design aside though, there's still that obvious fact that we have to rely on various $mtgoxes for market price :/ Though I'm not sure what be a better source for a fiat-btc exchange rate (iirc this was a mini-thread somewhere in logs)
lobbes: Then I have Process B that is triggered on changes to that database doing the various "market price" retrieval and volume averaging. Process B inserts retrieved data into database and Process A responds accordingly
lobbes: been thinking through tickerbot design, and seems like the sane thing would be to have Process A (which is an instance of logbot-genesis with "logbot-multiple-channels-corrected" patch) running that makes changes to a postgresql database.
a111: Logged on 2018-04-12 20:20 spyked: zx2c4, I've been looking over the tamarin protocol verification paper and I'm curious, what does "symbolic verification" mean? also, what's the thing's output? is it just a "yes, properties hold" or does it also output the proof?
zx2c4: spyked: http://btcbase.org/log/2018-04-12#1797801 tamarin (and cryptoverif and proverif) spit out the proof too. tamarin has a nice mode that will draw diagrams and flow charts too to make it easier to digest the proofs. people even have scripts to convert the output into latex in case you want an academic paper for free... ☝︎☟︎
a111: Logged on 2018-04-12 18:35 asciilifeform: http://btcbase.org/log/2018-04-12#1797532 << as far as i can tell the 'rsa has structure! but aes, surely not' is instance of minsky's empty room ( http://btcbase.org/log/2014-11-13#920444 )
zx2c4: asciilifeform: http://btcbase.org/log/2018-04-12#1797596 obviously aes has quite a bit of structure too, but there's a difference ☝︎
a111: Logged on 2018-04-12 18:06 mircea_popescu: http://btcbase.org/log/2018-04-12#1797132 << this counterstructure argument is actually quite strong ; may indeed be stronger than the proponent realizes.
zx2c4: mircea_popescu: http://btcbase.org/log/2018-04-12#1797532 why stronger than i realize? ☝︎
a111: Logged on 2018-04-12 18:00 asciilifeform: it resembles 'nano ecc' which at 1 point asciilifeform tried to port to trb
zx2c4: mircea_popescu: asciilifeform: http://btcbase.org/log/2018-04-12#1797528 http://btcbase.org/log/2018-04-12#1797506 -- in case you're interested in the ecc stuff more, the formally verified fiat and hacl implementations are not the only ones we have. we also have constant time accelerated x86 adx and bmi2 implementations https://git.zx2c4.com/WireGuard/tree/src/crypto/curve25519-x86_64.h and also constant time accelerated arm neon implementations ☝︎☝︎
a111: Logged on 2018-04-12 07:03 trinque will get to these tomorrow, girls
asciilifeform: ^ trinque ?
asciilifeform: spyked: it'll happen. tho i am aiming for folx to end up answering 'this did not need sparkism, it is evidently correct to naked eyes'
a111: Logged on 2018-04-12 20:55 asciilifeform: ada's spark is a similar, if somewhat uglier/bulkier, thing
spyked: http://btcbase.org/log/2018-04-12#1797815 <-- must confess that I am eager to read FFA spark. ☝︎
asciilifeform: spyked: i dun have anything against mechanical proof per se; but it is NOT a substitute for fits-in-head, because there is nor cannot be any such substitute. and the mass of the theorem-verifier is to be included with the mass of the program, for the purpose of 'is this head-fittable'. but possibly i repeat old thread.
asciilifeform: spyked: sorta how it is ~impossible to write a prolog proggy without several times ending up asking machine np-hard question.
a111: Logged on 2018-04-12 20:52 asciilifeform: http://btcbase.org/log/2018-04-12#1797799 << if this looks monstrous, prepare to barf when you consider how much the ~verifier~ weighs
spyked: http://btcbase.org/log/2018-04-12#1797811 <-- been there. and the kernel is not monstrous (paper: http://www.cs.ru.nl/~freek/courses/tt-2012/papers/sadhana.pdf -- funfact: a bastard version of mccarthy's "maxwell equations" lies buried somewhere in there), but attempting to use it to solve even simple problems from 7th grade mathbook can lead to huge codebase. and will inevitably bring the computer-aided mathematician to an existential ☝︎
ben_vulpes: yeah i can't this thread anymore, too damn seductive.
ben_vulpes: bang gas is then a pressure-drop triggered combustion?
asciilifeform: neh that's not 'premixed in the tank' lol
mimisbrunnr: Logged on 2018-03-23 04:08 douchebag: Okay, why do you guys liek arguing so much? Is this why you guys don't get anything done?
ben_vulpes: anyways i have a girthy sql to wrestle and http://logs.bvulpes.com/trilema?d=2018-3-23#317862
ben_vulpes: this gets tried once a generation
asciilifeform: probably a simple calculation would tell us 'nope'. and if al schwartz were here, he might deign to post it
asciilifeform: whether it is possible to create this condition mechanically, purely from result of vehicle's motion -- i do not know ☟︎
asciilifeform: above certain temp, water cannot exist, only h2, o2
asciilifeform: ben_vulpes: there is of course another way to get dry air
ben_vulpes: i think it puts the water in the wrong place. you get dry, hot air which you'd then have to cool and compress into the engine and cold wet air (possibly with the water condensed out entirely with a spigot)
jurov: you want it to separate water, no?
ben_vulpes: you get some gases that speed up, pulling energy out of the gases that slow down which dump energy into the higher speed gases. not purely a 'sorter'.
ben_vulpes: jurov: it's alll the same thiiiiing
jurov: but i don't know if same temperature means h2o and o2 molecules have same momentum? or they have same kkinetic energy?
asciilifeform: jurov: naturally not 'by temperature' purely, or you would have 'maxwell's daemon' lol
jurov: i think the vortex sorts particles by momentum, not necessarily by temperature ☟︎
asciilifeform does not harbour any illusions that this is 'easy pill' -- think, e.g. korolev would have had this pill, if it were so easy. but curious re the prohibitive boojum specifically.
ben_vulpes: this is the ramjet
ben_vulpes: not on the tarmac
asciilifeform: the motion of the rocket ( align the tube with the motion axis, naturally ) does this for you, neh
ben_vulpes: you'll want to compress it somewhat for reasons of efficiency; consider again the diesel and its turbo
asciilifeform: why not pipe it straight to the chamber.
asciilifeform: colour me again thick, why does the dry air require cooling ? esp if your intended use for it is rocket oxidizer
asciilifeform: outer tap -- 'hot' -- is dry air
asciilifeform: consider what happens in the vortex. center tap gives you 'cold end', which contains the heavier objects, incl. water
ben_vulpes: heh well then you gotta cool the dryer, dontcha
asciilifeform: ben_vulpes: don't fixate on the cooling ; i proposed it as simple means of producing 'dry' air
asciilifeform: ben_vulpes: you'd want prolly something like the 'mouth' of mig-15
ben_vulpes: asciilifeform: yeah here and there, more frequently we simply flooded the workpiece with coolant.
ben_vulpes: might work if you had enough expander and volume to slow the intake down and get it out of the incompressible regime
asciilifeform: intake of 'whistle' goes to the house air hose
asciilifeform: btw ben_vulpes probably has held in his hands, the tube : they are often found in machine shops
ben_vulpes: "The Use of the Expansion of Gases in a Centrifugal Field as Cooling Process"
ben_vulpes: there is an expander in the diagram, had a sign error
ben_vulpes: nono color me thick
asciilifeform: ben_vulpes: colour me thick, but how does the compression of oncoming gas ~pull out~ heat ? consider how 'reentry heat' comes about.
ben_vulpes: it'll cool, sure, but nowhere near as much as if it were a gas, as the gas will condense and pull further heat out of the local system.
asciilifeform: ( though i suspect something like it would even work in a 'springy' solid. see 'phonons' etc )
ben_vulpes: just cribbing from wikipedia here, but "there is no longer cooling observed since cooling requires compressibility of the working fluid"
asciilifeform: ben_vulpes: iirc wirbelrohr works just the same on liquids
asciilifeform: must point out, i haven't the faintest reason to think that it would work; was specifically curious re whynot
ben_vulpes: refrigeration depends on compressibility of the working fluid
asciilifeform: ( as well as the fact that it has to work 'from parking lot to mach X' )
asciilifeform: as i understand, would be constrained by possible length of the tube and the strength of the material from which it is made
ben_vulpes: my first q is what is the breadth of intake gas velocities and fluxes that such a device could handle
asciilifeform: ben_vulpes: gives you clean, h2o-free o2, if the spigot is placed correctly in the vortex, as i understand
asciilifeform: ben_vulpes: http://btcbase.org/log/2018-04-12#1796970 << here's a thing i wondered about for many yrs : is there any reason why a wirbelrohr could not do the job of 'frost control' in an 'airbreather rocket' ? ☝︎
asciilifeform: ^ possibly thread.
asciilifeform: ada's spark is a similar, if somewhat uglier/bulkier, thing ☟︎
asciilifeform: spyked: in re proof machines, i'm much moar interested in items like ACL2 , where you can affix your hand-written program to a hand-written proof of correctness in a mechanically-reliable way ☟︎
asciilifeform: ( and i dun think i need to explain that the mecha-proof is ~meaningless~ without reading the claimed verifier )
a111: Logged on 2018-04-12 20:16 spyked: anyway, back to http://btcbase.org/log/2018-04-12#1797753 : also, I ran a http://p.bvulpes.com/pastes/hYZVy/?raw=true out of curiosity. results: cca 150k LoC of proof (of which ~10k just the basic definitions) that generate another cca 100k LoC of C code. but to be fair, this is for more than just 25519
asciilifeform: http://btcbase.org/log/2018-04-12#1797799 << if this looks monstrous, prepare to barf when you consider how much the ~verifier~ weighs ☝︎☟︎
asciilifeform: 'reasonable' meaning, on top of mere compactness, other fine things like heaplessness
asciilifeform: ( somewhere along the lines of http://btcbase.org/log/2018-02-02#1780200 thread ) ☝︎
a111: Logged on 2018-04-12 20:10 trinque: a muntzed drakma would be a fine thing, I'd sign
asciilifeform: http://btcbase.org/log/2018-04-12#1797798 << 1 of the things on asciilifeform's 'wish list', is a reasonable ada http serv ☝︎
asciilifeform: but this was enuff for the tech to find its way to the cargocultists.
asciilifeform: unfortunately it never went far beyond 'rediscovered pythagor's theorem'
asciilifeform: spyked: if you recall, back in the 'minsky age', that was the initial attraction of mechanical 'reasoners' -- discovery of ~simple~ inferences ☟︎
spyked: more to the point, this is similar to asciilifeform's "auditability" question. is there a way to obtain a (ideally human-readable) set of deductions out of the prover?
spyked: zx2c4, I've been looking over the tamarin protocol verification paper and I'm curious, what does "symbolic verification" mean? also, what's the thing's output? is it just a "yes, properties hold" or does it also output the proof? ☟︎
a111: Logged on 2018-04-12 19:58 spyked: http://btcbase.org/log/2018-04-12#1797506 <-- ain't gonna bitch about that. but just for lulz: http://archive.is/tatUF and to think, proof systems (Coq, Isabelle/HOL, etc.) exist mainly to slap humans on their wrists when they err.
spyked: anyway, back to http://btcbase.org/log/2018-04-12#1797753 : also, I ran a http://p.bvulpes.com/pastes/hYZVy/?raw=true out of curiosity. results: cca 150k LoC of proof (of which ~10k just the basic definitions) that generate another cca 100k LoC of C code. but to be fair, this is for more than just 25519 ☝︎☟︎
trinque: a muntzed drakma would be a fine thing, I'd sign ☟︎
spyked: whole thing's a mess, but I'm organizing the code so that I can eventually replace it with something else.
spyked: okay then, I'm gonna work it off this. it'd be enough to replace the "drakma" http client with something lighter, and I'd already cut about half of it. the dependency tree leads to two xml parser libraries being used (plus other redundant stuff).
trinque: nope, current thing is a sad pythonball hanging off the side.