Discussion on Science Technology Engineering and Mathematics, please post interesting articles, things you are learning in school, or other general STEM related discussion!

Simply this expression and you get a gold star. (A & ~B) | (A & B) = ?

@Deleted User A

Heh, /sci/ memes welcome

Hey, if you copy and paste equations into the Windows calculator accessory, it will solve them for you. The only symbol that it does not recognize is ^. Do you know of another way to enter that symbol on the Windows calculator? I am trying to copy and paste an amortization formula, but it won't work because it uses the ^ symbol.

@Rick That's tough, it may not take it. Have you tried Wolfram Alpha? https://www.wolframalpha.com/

Thanks! That worked!

Great! Yeah it's a nifty tool, my first go to for almost any equation. Sometimes it gives you cool extra info too like graphs

I'm a geologist if anyone needs earth science help.

*You are on the path to understanding*

Henlo goys, if anyone is interested in civil engineering and heavy civil construction, I can answer any questions you have

I'm a computer programmer, work mostly with Ruby doing web services

IF anyone else is in the biotech field let me know. I also may be able to help if there are any questions regarding the subject

@Sean can you inject me with CRISPRs that will reverse my age by 15 years?

https://www.youtube.com/watch?v=IrXHsg_d1Hw

@ThisIsChris Is that a stat class you are taking?

@FivePointPalm It's incredible to me that Gattaca isn't Identitarian required watching

@Deleted User It's from "Pattern Recognition and Machine Learning" by Timothy Bishop. I was just glancing through it while waiting through the train. For my job (datascientist) I like to have at least a high level acquaintance with these things in case they come up.

Gattaca is about an untermench kike selfishly subverting the social order to gain privileges he doesn't deserve.

It's a beautiful story about self sacrifice and the struggle of humanity for greatness

Study the STEMs so you wont catch the poors

I want to start picking up some IT certs to make a career change. Any advice on where to start learning what I need for CompTIA A+? Any good free resources, or should I just pick up a book from Amazon?

I would say just get started. Setup an old PC as a Windows Domain Controller or something like that. I don't know much about IT or Windows but I got into web development by just doing it, picking up languages and technologies at home as a hobby and then at work as needed.

@Deleted User Look up Professor Messer on YouTube

https://youtu.be/SlzwMKcCoMI?list=PLQryb-FUreLBsGjFDmMZfmaCa-0XV-geq

I suggest getting the a+ and then applying for Help Desk jobs. You can then chat with the Network, Security, System Admin, and Development teams to see what direction you want to go.

@Deleted User

Thanks!

Am I a Neanderthal or a homo sapien? What is a black person?

Homo erectus

just noticed this. I have a degree in physics, minor in math, so I can answer questions about that. I don't always check this, so feel free to tag me.

If gravity affects time as well as space, and the Big Bang is the mother of all gravitational events, is it true that there may be some places in the universe that the Big Bang, which to us happened 13 billions years ago, actually just happened an instant ago?

@Joe-MN

Don't know a lot about general relativity to be honest. That's a good question. I don't think the big bang itself would be a factor, but if something has been moving relative to us for a long time and then slowed down to catch up with us, it would be younger. Likewise if an object spent a lot of time in a high gravity environment, it would be younger. Also since it takes a finite amount of time for light to travel, when we look at galaxies very far away, we're looking back in time.

The weird thing is that the galaxy can expand faster than the SOL which is hard to wrap my head around but definitely goes to the temperaneousness of the Big Bang for certain places in the universe.

I had not heard that one.

I am a layman, so I will defer to the experts. But my understanding is that only physical objects are bound by relativity and SOL rules. The universe itself is not physical so the SOL rules don't apply and I have read in multiple places that the universe does/did expand faster. How that jives with time and space is something cool to think about.

Sure is!

The concept makes sense - spacetime itself not having mass and therefore not being bound by the same rules as things that have mass

Light has no mass though. A lot of theoretical physics seems to be a group of lazy (((people))) that made up ideas to make their equations work

Well, as I understand it, the modern view of light isn't so much that its a particle/wave as it is something that exists in spacetime itself. Kind of like the color of my shower curtain. I shake the shower curtain and the color ripples.

But there's no, err, shooting, of a separate particle, like a canon.

If you want to watch a show that will blow your minds, check out Through The Wormhole With Morgan Freeman (I know, but he is just the narrator). The show is a science doc that focuses on these questions and interviews top scientists from around the world.

It primarily focuses on the convergence of physics and philosophy.

I like Morgan Freeman.

I also like deGrasse Tyson.

I am not a fan of Tyson so much...a lot of his opinions rub me the wrong way, but that is just personal preference. He is definitely a smart guy

He teaches a pretty good lecture series on The Great Courses about explaining mysteries of the universe.

One cool thing he points out about relativity is that time stands still for photons since they travel at light speed which (if you believe it) means that a photon traveling across say 30 million light years of space does so in an instant.

He also understands that we don't really know anything about the universe.

If you ever want to blow your mind, look up some of the experiments in Retrocausality. Scientists claim they have proven that a future event triggered the present event (past from the future event's perspective) on the quantum level

And replicated the event in the lab and published complete with peer review

Not only does that photon not experience any passage of time -- space (space-time, ya know.) contraction occurs as well. So from the perspective of that photon it hasn't moved through space at all. It's merely emitted and absorbed instantaneously within a tiny portion of spacetime. Pretty cool stuff.

@Darth I think I heard about that! They had set up a transmitter and a receiver and thought they were close to the receiver receiving the transmission before it was sent.

Oh, I forgot about this since I have the whole server muted. So yes, relativity just says that objects moving through space can't go faster than light, space itself expanding isn't really covered by that, since it's not moving through anything. I haven't really studied GR so I don't know all about that though.

"Well, as I understand it, the modern view of light isn't so much that its a particle/wave as it is something that exists in spacetime itself."
Modern physics doesn't need to make a hard distinction between 'objects' and light, the same set of equations governs them. They both exist in spacetime, it's where everything exists, and they both have wave particle duality. Electrons have wave properties too, if you send them though a narrow opening, they behave in a way that a pure particle never could.

is there any way to get notifications from just one channel but not the others in a server?

I think you can mute channels.

@Joe-MN ^

https://discord.gg/ThkG7e New discord dedicated to sci + tech (and culture) with an emphasis on futurology and emerging tech (note: this server is not identitarian exclusive)

^ To be clear, this is not a replacement of this channel or server

Anyone into machine learning, deep learning, etc? @here

What’s that?

AI, I think.

@Why Tea I do some at work and did some for my degree

Do you ? @Why Tea

Cool. I've been reading some on coding it. My employer (big big company) is a huge player in it, but I'm not involved in it at all at work.

http://neuralnetworksanddeeplearning.com/chap1.html

Is this a good place to start (sure looks like it) and what other resources do you think are worth looking at?

@Deleted User Yes, one way / model of dealing with AI.

@Why Tea what resource to use and what to focus on depends a lot on what you're actually working on.

Are you doing some sort of image or signal processing? If so then yes Neural Networks sounds good and that site is a good start.

But Neural Networks aren't useful for every problem (though some academics are trying to push the idea that they are) so step one I would ask are you absolutely sure they are necessary for your work.

You can tell what machine learning things to focus on by laying out what type of inputs and outputs you are doing. The dimensions your data can fit are usually sequential vs non-sequential (i.e. a sentence is a sequence of words, an image is just a single vector of numbers) and categorical/symbolic vs cardinal vs ordinal.

Right, right. Thanks. But I'm not working on anything *specific* yet, as I'm trying to learn.

Of course one of the best ways to learn is to pick a thing you'd like to do, and try to solve the problem, but I'm not there yet.

@Why Tea in that case the best and most useful I've used and recommend is this one https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-034-artificial-intelligence-fall-2010/lecture-videos/

Excellent, thanks!

I love the MIT courses that are available.

MIT open courseware on Artificial Intelligence

You're welcome, yeah they are great

I’ve also heard good things about the Coursera online courses for this.

I took a Coursera course in Data Analytics learning R and they did a better job than Texas A&M’s graduate class on the same topic (I took both).

Yeah Coursera's first course was a pretty good Machine Learning Course by Andrew Ng, but last year they changed the format of the Coursera website SO MUCH that I now find it virtually unusable. That's partly by design, they give very little away for free anymore and they tightly restrict when materials are available.

So just pay for it.

That probably works for some people, but ever since after I finished school I usually study a subject in spurts in a way that doesn't fit well with Coursera's pricing model. I say this as someone who has paid for their courses and generally didn't get my money's worth before they expired.

The best experience I had with a paid Coursera course was when I was doing a programming course with other people. I feel like that model works best for Coursera because that's closest to the classroom model they are going for

When I study on my own though, I like to dive deep into something in a few goes when all of a sudden a few spare hours open up. Coursera is not conducive to this though. Courses start periodically so if it doesn't happen to be the first week of their course then you are SOL. And then the longer courses they have roll out the course material one week at a time, preventing a dive in.

That's why I like to just have all the course materials available at once, all the time. I don't think Coursera has that model for any of the courses I was interested in though.

I do some machine learning light for work and have a masters in data science from Berkeley

I can answer basic questions

@Why Tea

It's a lot of hype concealing a clever compilation of basic techniques but a very powerful concept once understood.

It's most useful applications involve large datasets. Currently there are innumerable opportunities for application. The limiting factor is usually expertise and leadership buy in.

Even still one of the most widely applied machine learning techniques is linear regression.

This fact reveals the simplicity at the core of the concept.

Its a beautiful simplicity though and there is a growing library of well documented algorithms for various applications. Even still > 80% of the work is just wrangling the data and pre processing.

If you want to learn check out kaggle.com look at winning solutions for problems that interest you.

For coding I recommend "anacondas" python distribution.

Comes with lots of machine learning and data wrangling libraries pre installed.

Getting involved in a datakind.org project is another good way to learn.

Cool, thanks, @Perihelion - CA

@StrawberryArmada is a sick band

Anybody do tutoring stem in college? how practical idea to make money in college, it sounds like a good idea eventually I'm studying electrical engineering and so far in calculus one.

@Tyler Baker I made some decent side money while tutoring in college, I was charging faily cheap and networked quite a bit

It helped that I worked in the school's tutoring center, students liked my tutoring and asked for private tutoring outside the scheduled hours I worked for the school

sounds good, I was thinking about working in the tutoring center and then eventually doing private tutoring wich im sure is more of a responsibility.

@Tyler Baker yeah there's a great economy of scale in doing it this way, in the sense that at the tutoring center you figure out what it is the students are learning at that time, and it gives you a place to practice that topic and make mistakes if working through it the first time in a while, and then you're prepared for private tutoring

private tutoring later that week I mean

and then during finals week I wound up working 8-12 hour days tutoring

at 20 bucks an hour off the books it was pretty nice

Nice better than doing some cheap labor on the side, kill two birds with one stone

yeah exactly

What I did during the school year was grading + tutoring for the school + private tutoring

it works out alright when you add it all up, and it's all related so you aren't switching modes too much

it helps to get in good with a department, for me it was the math department

I just need to get some classes under my belt probably since im only now getting into calc 1, ive don calc in highschool i was pretty good at it.

by "get in good" I mean I just hung out there all the time

sweet

yeah calc is fun, I wound up sticking with that sort of stuff for a long time

I know a wahmen that's a professional tutor. That's what she does for work, and does it for private school kids, and makes a very good living doing it, sets her own hours, "fires" customers if they don't work out, etc.

how do you get started in that?

sounds hard to even get customers

I can ask her how she did it. Customers snowballed by word of mouth so now there's the equivalent of a "waiting list" and she's considering hiring some people to fill in.

cool, thanks

My sister in law runs her own tutoring center. Snowballed from private highschool tutoring. She mostly just keeps them focused and shields them from neurotic parents.

She's started to sub out subjects she doesn't want to teach personally

Real money is in test prep though. most parents want to see certifications and high test scores from you to prove you're worth the price.

Any recommendations for textbooks on physical anthropology?

Or anything about understanding people's racial origins by seeing their physical characteristics

What level of physical anthropology?

@Tyler Baker Calc 1 was fun memories, Calc 2 was harder, Calc 3 is pretty cool so farm

Far*

MATH

math

multivariable calc, right? I loved that.

Sequences and series with matrix, vector and linear functions.

College won't give me calc 1 credit, so I'm taking calc 3 to add to my calc 2 credit.

@JC17-OR I primarily want to be able to identify jews by looking at them, I'm secondarily curious in knowing the features of various other subpopulations especially european ones

I can't think of any textbook which has that kind of info. The best advice would be to study the faces of known Jews. The trick is in the proportions of facial dimensions, though some Jews are hard to spot due to mixing.

Yep, one of the things I looked into recently (mentioned on the daily shoah) is what's called "the semitic smile". It's a way the lips curl on semitic people that gives them a slight smiling look, that euros don't have. It's more distinctive among semites than the famous jew nose. I'd like to know all these features of identifying so not only relying on one (like the nose) but on a few different ones in trying to determine if someone is a jew by eye. In my day-to-day experience I think I meet more Jews than normal whites, and often you can just tell but sometimes it's ambiguous and it would be helpful to know distinguishing features among jews and euros to understand better.

Interesting, I've not heard of the smile. I mostly identify Jews by the traces of admixture you can see in facial proportions. Natural eye I guess.

@JC17-OR is there a name for that? In fact I think I heard someone mention something about almond eyes

Old textbooks would help you, nothing new.

@Joe-MN any suggestions which old textbooks? a lot of the newer stuff seems really autistic about monkeys and stuff I don't care about lol

no idea

go to a library, maybe a university library

yeah I wish I was still in university

find old books online, scanned ones or whatever

just go there

Archive.org might have some texts to read.

Here's an article on faces and ancestry.
https://m.medicalxpress.com/news/2014-03-d-links-facial-features-dna.html

Try to look for texts from 70s or before. You could also look up craniometry texts, which may help.

On a slightly related note the DSM II and DSM listed being homo a mental disorder, then they got cucky

Thanks @JC17-OR !

Psychology is for small brains acting like big brains though, they even got rid of p values for their studies

Depends on the field. Analytical psychology still has p-values and statistical analysis, but cultural, social and abnormal have reduced their empiricism drastically.

When I was studying criminology, we didn't review a single study with statistical analysis.

@ThisIsChris I would recommend reading "racial biology of Jews". It's older, but may help you in your endeavors to understand the biology and ancestry of the Jews.

@JC17-OR this is perfect, even without pictures it is very clear, thanks!

Link for the interested: https://archive.org/stream/RacialBiologyOfTheJews/RBJ#page/n5/mode/2up

Anyone here following ZUMA at all?

@Cait_Bradshaw - MA what's that?

It was a Space X satellite that was secretly launched supposedly.

It was a US satellite designed by Northrop Grumman or something

And launched by spacex

Supposedly it "failed"

A problem with second stage separation apparently

But SpaceX claims the second stage separated correctly

The Gov refuses comment because the nature of the satellite is classified

The satellite is however essentially "registered"

Which only happens if it completes an orbit or something

@StrawberryArmada that's interesting!! Do you think something spoopy is going on?

We launch secret stuff all the time. I'm kinda surprised they used spaceX but if the launch was time sensitive maybe NASA didn't have a vehicle ready.

NASA doesn't have its own launch capabilities anymore I believe

They are wholly reliant on SpaceX, Space Launch Alliance, and worse: russia

https://youtu.be/8dDRBvjcjwE

The government and SpaceX refuse to say it failed outright

Media says the gov said it failed

If it failed then we lost one billion dollars

If not why are they saying it did

I'm not sure where to ask this, but how do you guys feel about common core?

@micbwilli I'm curious about it but don't know much about it. Do you have any thoughts? I used to teach college math classes and some of the freshmen needed to be whipped into shape but I don't know if it has any relation to common core. Though I did have a lot of students asking if I would be "grading based on the correctness of the answers" to which I was like "yes lol why" and apparently a lot of high school students are NOT graded based on the correctness of their answers?? Idk if that is a common core thing or just a their schools thing though.

I don't trust it. It was brought in with no studies on efficacy. All the teachers on the ground seem to hate it.

I get nervous about a lot of these programs of dubious effect. If the outcome is equality than the mechanism is to bring down the top students, because rasping the others to meet them is not usually a possibility. One of the major backers even said CC was a way to stamp out "white privilege".

Does anyone here know Matlab? I’m taking a Matlab class and am super confused

Did you take matrix algebra aka linear algebra?

The simpler versions need you to understand basic matrix algebra concepts

https://youtu.be/j2Mu8qfVb5I

Wrong place. :P

It's appropriate, it's science

not for macgoyver though.

Odd fellow (as to be expected), but it was a decent watch.

I wasn't saying this above thing was wrong. I made a post here that was supposed to be in another section and I deleted it.

ohh lol

@Sam Southern - TN I know some matlab

Anyone in the petroleum industry?

@here ^^^

Im familiar with network engineering in the petrol industry, but I've never worked directly for a petrol company. Lots of BGP.

@Brandon Ironside- ND

@Freiheit - CA I got my degree in petroleum engineering, though I work in aviation engineering at the moment. What you need? Thanks for tag @Havamal

@Brandon Ironside- ND Looking to start a new career. I want to make my fortune. I think opening Anwar, Gull Island &c. will make for a boom in oil when they run a pipe across the continent.

@Freiheit - CA Your going to be competing against some of the biggest corporations in the world, do you plan on wildcating? I think that's going to be your only in, get in early like some of the smaller companies did in the bakkan. it doesn't help that there is record production of oil at the moment.

I must clarify. I'm looking for an entry option. Where would someone with no experience begin to end at high pay?

It's possible to walk onto a rig as a roughneck and elevate yourself to company man position if you are very competant, adverse to high stress, can pick up technical drilling intuition, and are ok with very little social life that comes with living in remote areas and a disproportionately male population. If you can handle all that there is good money to be made.

@Brandon Ironside- ND Have you worked in the oil industry? I was under the impression the boom was dead

@John O - only as an intern for a brief period. The boom is dead for now with the current oil prices. I choose to take my career into a different engineering direction after what little exposure I did have right out of college.

there still is work though, just not boom levels

Is it $120k a year like it was a decade ago?

I'm not considering it, just wondering. I know a lot of guys who made ridiculous money back then

newer engineers aren't making that anymore, senior engineers can make 200-300k still.

my friends who did get oil engineering jobs are making 55 - 75k similar to other engineering fields just out of college

I'm talking roughnecks

41653

Oh, yea close to above number now

That sucks.

Happy Pi Day!

Any of you goys into data mining? I've been fiddling around with R a lot recently.

@Attrition in the desert

@ThisIsChris Yeah I structure a lot of unstructured data on the web for economic system research mostly.

Been getting into data science comprehensively lately, I feel like the field is about to blow up.

@Attrition in the desert definitely! What data is it that you are making available and to who?

@ThisIsChris Mostly data on commerce exchanges in SE asia. The place I'm working at now handles a lot of soft/hard currency transactions.

https://www.livescience.com/60476-jellyfish-sleep.html

That's neat. I wonder if it's simultaneously done in all areas of the animal.

Hey guys, I'm Nick, and I'm a ChemE undergraduate from NY, excited to talk with all of you

nic

*nice

@Nicholas1166 - NY roll'd

roll'd?

@Nicholas1166 - NY sorry, role'd not roll'd. I gave you the @`AE` role (academic expert) so you will be alerted when people ping @`AE` with academic questions you may be able to help with.

Ah, OK. Yeah, I'd be glad to lend a hand if I can, although I am just a junior right now

I'm graduated from a university with a degree in math

ask me math questions

if you need halp

I very well might, math is my weakest subject. Thank you for the offer.

I didn't know this sever had a role thing. Can I get a role and be alerted?

@micbwilli done!

@ThisIsChris hey do you have any good explanation on how to find isomorphisms between two polynomial factor groups?

that is an isomorphism phi: F[x]/f1(x) -> F[x]/f2(x) where F[x] is the field of polynomials with coefficients in Z_q and f1(x) and f2(x) are irreducible polynomials in F[x]

@YourFundamentalTheorum by F[x]/f1(x) do you mean a quotient group? If so, what is the group you are doing F[x] modulo with? f1 doesn't generate a group unless I am missing something

@ThisIsChris quotient field

and F[x] is a field of polynomials in x with coefficients in Z_q

@YourFundamentalTheorum thanks. How about for an element of F[x]/f1 called G, take a representative g, phi(G) = the coset of g*f2/f1 . Need to prove that the coset is independent of the choice of representative g

the last part is a given.

On the right hand side I mean g times f2 divided by f1 in the normal sense for poly nomials

F[x]/f1(x) is usually represented by all the polynomials """"less than""""" f1(x)

a lesser degree than f1(x) that is

Hm, what happens in the three cases where f2 is higher, equal, or lesser degree than f1?

assume f1 and f2 are of the same degree

otherwise you don't have the same cardinalities

which means they can't be isomorphic