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the 3Blue1Brown Summer of Math Exposition videos are starting to trickle in and there are already some good ones https://www.youtube.com/watch?v=FQYOpD7tv30
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Aug 20, 2023 19:04
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Here's some α, β and γ: https://www.youtube.com/watch?v=-qWQaX8_EDY
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Aug 21, 2023 22:20
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https://www.youtube.com/watch?v=kmAc1nDizu0 very intersting
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Aug 22, 2023 10:31
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this rules https://www.youtube.com/watch?v=jlh21U2texo
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Aug 22, 2023 10:37
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BlankSystemDaemon posted:Here's some α, β and γ: this is sick thanks
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Aug 22, 2023 10:41
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BlankSystemDaemon posted:Here's some α, β and γ: 
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Aug 22, 2023 17:10
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echinopsis posted:https://www.youtube.com/watch?v=kmAc1nDizu0 this was cool
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Aug 23, 2023 03:41
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drat did you take that from my old job? they had all kinds of poo poo like that all over the lab
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Aug 23, 2023 04:09
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Dijkstracula posted:this was cool ikr it’s a real mindfuck plus the dude is extremely engaging
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Aug 23, 2023 04:45
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Instantly recognized this as a diode multiplier. It's a totally valid and functional circuit https://en.wikipedia.org/wiki/Voltage_multiplier also do not touch the far end of that resistor string k
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Aug 23, 2023 04:50
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in the video the dude says it’s to stop him dying
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Aug 23, 2023 04:55
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echinopsis posted:in the video the dude says it’s to stop him dying It will also hurt. A lot.
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Aug 23, 2023 10:13
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echinopsis posted:https://www.youtube.com/watch?v=kmAc1nDizu0 this was cool, i didn't realise the busy beaver function was so interesting. how on earth is it proven that it grows faster than all other computable functions, is it by construction (it's defined as the largest for a given number of state turing machine, and any computable function must be equivalent to a turing machine? I don't see how you'd relate the number of states to the input to the other function though, or if this is even something you can compare)
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Aug 23, 2023 12:05
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the argument is in there: assume we have a faster-growing computable function f. by definition of "computable" this means that there exists some turing machine T which implements f, i.e. the machine T started with x zeroes on the tape it'll halt with f(x) 1's on the tape (we can pick these details of its implementation freely, it is easy enough to reencode things as needed). let n be the number of states in the (arbitrarily chosen) smallest such turing machine T. but then as bb(n) simulates all turing machine with n states T will be among them, bb picking the one that outputs the largest value, which means in the end we must have bb(n)>=f(n), and as you can trivially construct a n+1 state turing machine that implements f from the one with n states (just add them without having them do anything) we have bb(x)>=f(x) for all x>=n. note to be clear that the busy beaver function (which is a cool and good name) is not itself computable, as you can never know whether the highest result you've seen out of a turing machine so far is the actual busy beaver and the rest are just spinning infinitely, or whether in a moment another will halt with a larger value.
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Aug 23, 2023 13:35
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actually, shorter and better: what the busy beaver *does* is run all computable functions (represented by turing machines) and takes a max of the result, so it will necessarily grow at least as fast as any particular one you pick.
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Aug 23, 2023 16:38
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busy beaver function-adjacent content: https://www.youtube.com/watch?v=ym8x8B930tM
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Aug 23, 2023 17:04
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there’s this youtuber called hoser and he does edutainment videos about the history of nations and idk it’s kinda interesting and the sense of humour appeals to me and i’m sure it’s easy to pick holes in them but I like them
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Aug 24, 2023 21:11
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echinopsis posted:there’s this youtuber called hoser and he does edutainment videos about the history of nations and idk it’s kinda interesting and the sense of humour appeals to me and i’m sure it’s easy to pick holes in them but I like them did they do a vudeo on NZ and do you agree with ti? sorry for the spelling I've had a couple
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Aug 24, 2023 21:13
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no although they does have a video that is top ten countries by geography and nz was on there imo they’re pretty good at showing why a country is the way it is. the ones on ethiopia and afghanistan are good, but also many more
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Aug 24, 2023 21:28
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Cybernetic Vermin posted:actually, shorter and better: what the busy beaver *does* is run all computable functions (represented by turing machines) and takes a max of the result, so it will necessarily grow at least as fast as any particular one you pick. neat, that makes sense
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Aug 24, 2023 21:51
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new lowtechmagazine articles just dropped https://solar.lowtechmagazine.com/2023/07/human-powered-air-compressor-and-energy-storage-system/ https://solar.lowtechmagazine.com/2023/08/direct-solar-power-off-grid-without-batteries/
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Aug 27, 2023 17:50
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i've never heard of this low tech magazine. i like it
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Aug 27, 2023 18:39
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Achmed Jones posted:i've never heard of this low tech magazine. i like it its great here's an all-timer https://www.lowtechmagazine.com/2011/12/the-chinese-wheelbarrow.html
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Aug 27, 2023 18:47
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holy poo poo
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Aug 27, 2023 18:55
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low-tech magazine is great
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Aug 27, 2023 18:58
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Cool
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Aug 27, 2023 19:02
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Achmed Jones posted:i've never heard of this low tech magazine. i like it Same
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Aug 27, 2023 19:21
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rotor posted:new lowtechmagazine articles just dropped agree with all, these look great. but are they down for anyone else? just the “solar” subdomain, the “www” seems to work just fine. I’m trying to see if it’s them or me
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Aug 28, 2023 02:02
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namlosh posted:agree with all, these look great. but are they down for anyone else? just the “solar” subdomain, the “www” seems to work just fine. I’m trying to see if it’s them or me It's dark where the server is and it must have gotten a big load, it'll be back up after dawn gmt.
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Aug 28, 2023 02:06
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oh thats right, the “solar” domain runs off solar. anyway yeah lowtech magazine is da bes
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Aug 28, 2023 02:10
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https://www.youtube.com/watch?v=Qf8TGA2yOKI the childish humour tickles my fancy
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Aug 28, 2023 11:03
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https://www.youtube.com/watch?v=23bNW4G9DZk I am enjoying this
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Aug 28, 2023 11:52
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echinopsis posted:https://www.youtube.com/watch?v=23bNW4G9DZk i didn't watch the video but they're energy levels and a place to keep your point particles (electrons)
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Aug 28, 2023 23:56
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even though I thought I knew about orbitals and defo learned about them, that video gave me some sense of intuition which is probably coz I was high and it’s easy to placebo effect yourself into feeling like “now I really get it woah” which I love to feel
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Aug 29, 2023 01:17
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it also alluded to how some of the orbital might be out of phase from the other part and this sense that covalent bonds can form from the +ve part of one orbital and the -ve of one from a different atom. or whatever language is correct to use here
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Aug 29, 2023 01:20
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echinopsis posted:it also alluded to how some of the orbital might be out of phase from the other part and this sense that covalent bonds can form from the +ve part of one orbital and the -ve of one from a different atom. or whatever language is correct to use here your out of phase and can’t form covalent bonds, op
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Aug 29, 2023 01:29
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fart simpson posted:your out of phase and can’t form covalent bonds, op
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Aug 29, 2023 01:31
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fart simpson posted:your out of phase and can’t form covalent bonds, op https://www.youtube.com/watch?v=hK9_70pLX2M
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Aug 29, 2023 06:17
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echinopsis posted:it also alluded to how some of the orbital might be out of phase from the other part and this sense that covalent bonds can form from the +ve part of one orbital and the -ve of one from a different atom. or whatever language is correct to use here im p sure ive already posted this but the only thing you need 2 know about orbitals is that the dz2 orbital is the buttplug orbital 
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Aug 29, 2023 06:26
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https://www.youtube.com/watch?v=mo8ALgKUEfI
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Aug 29, 2023 06:50
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