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Archived threads in /sci/ - Science & Math - 33. page
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Why do biologists care about preserving species diversity, but not human diversity?
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>>8511153
Humans become more diverse on interbreeding. Preservation of diversity is the promotion of the free movement of populations.
>>
there is no evidence that human genetic diversity is significant enough to preserve.

pretty eye colors and skin color is an aspect of fashion not genetic diversity.

also biologists don't study human diversity. they study stamp collecting
>>
>>8511161
>there is no evidence that human genetic diversity is significant enough to preserve.
Why does there have to be a reason? There's no evidence that certain cultures needs to be preserve yet people still care about that.

A steel projectile of 4 grams traveling at 6000 feet per second has 6.6890e+3 joules (4.9336e+3 foot pounds) when it encounters an Eddy Current Brake.
How many watts are needed to power the brake in order to slow the projectile 50 feet per second in o inches,in 12 inches, and in 24 inches?
How hot would the steel become?
If you can't solve this problem please point me towards the equations I'd need to solve or what steps i'd need to take to solve.
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Do an energy balance

Energy at current speed = energy at end espeed + energy to change the momentum

Or something similar
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>>8511146
>>8511181
I forgot to say, assume brake is 99% efficient or 100% efficient.
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>>8511214
at 100% efficiency wouldn't input power into the machine only need to = 6.6890e+3 joules per second to stop the bullet in 1 second?

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Hey guys whats up, I'm a cancer researcher.
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Hello there, I am Pardeep, I am a software engineer
>>
Greetings everyone, I am Engineer
>>
>>8510955
>>8510959
>>8510964
Post the one where the girl has her hand on the heating element of the sodder tool

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I'm an undergrad in Electrical and Computer engineering. I fucking hate this analytical geometry shit. Does it go away after Multivariable calc? (Currently have an A in calc 2, btw) Or will I have to stick it out for differential equations as well?

Is there some nuance that I'm not grasping that'd make this shit meaningful..? I mean... Arc length of a cardioid? "Please remember the form of the equation of a limacon rose." What the fuck? Calc 2 makes us all into cucks.
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>>8510852
> Engineer doesn't understand geometry and can't interpret equations

Nothing to see here, folks
>>
>>8510860
>Instant shitty.
>>
Looks like your course is crap focused on memorizing formulas. I recommend memorizing them just so you can pass the exam.
You'll probably learn about line integrals on a real math course later. Then you won't have to remember so many formulas to figure out the length of a cardioid curve or whatever.

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Series A[n] = A[0] + nd

The square brackets mean subscript.

A[0] and d are integers. n equals 0,1,2,3....

Show that if a A[n] is a cube number then it means there are infinitely many cube numbers in the sequence.

I am a disgust brainlet, I know
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if A[n] is a cube, then A[k3n] is a cube for any k

please use the stupid questions thread next time
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>>8511626
sorry, i was a bit too fast.
if A[n] is a cube, then A[n + 3*k*b^2 + 3*k^2*d*b + k^3*d^2] is a cube
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>>8511637
where b is defined by A[n] = b^3 and k is any integer
i should go to sleep desu

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>straight A STEM student working a part time job in retail/fast food to pay student loans and is also in a romantic relationship

This is just a meme right? How the fuck can someone juggle so many things at once and still come out on top? AND while studying STEM?
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Well, if you can't handle life while studying... I've got bad news for you.
>>
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Considering the time value of money you'd have to be stupid to work a shitty job like that while planning for any remotely successful career. You're already either wealthy or taking out an assload of loans to attend college. Might as well enjoy your youth and focus on school work during that time.
>>
>>8510609
No. You don't understand. Human brains have not evolved to multitask. You just think we do because of /pop science/, but really you're just doing a little bit of everything which results in time wasting and procrastination

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can you explain me science behind cooking?

how does science explain what happens to food when you cook it? let's say potato. what happens to potato when cooked? does its molecules change?

they have to change because potato is hard, but when i cook the potato it becomes soft. however, when it cools down it stays soft instead of becoming hard again.

is there a way to uncook food? could i make potato hard again?
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As chemist, I'd say some molecule, starch in the specific case of the potato, "break" (hydrolyze) when cooked. The reaction is not reversible, and thus the potato remain soft even if cooled down.
In other cases other reactions occur, as denaturation of proteins in eggs.

Recently an ignobel when to someone who partially "uncooked" an egg, investigating and managing to fold back egg's proteins again, and so "uncook" it. I don't think it's possible to achieve it outside a lab, though.
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>>8510601
>>8510624
Yup, it's alllll about denaturing proteins and hydrolyzed starch and caramelization.

Watch Good Eats for food science goodness.
>>
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could you cook potatoes and remove all the carbohydrates from it using some chemical process in lab?

how would it affect its taste?

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>yfw the Chinese are actively participating in fucked up human experiments with CRISPR in an attempt to create a race of ultra intelligent overlords
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>>8510477
Lets hope they're benevolent overlords.

It's obvious the transhuman revolution will happen in east Asia. You better prepare.

My chinese lessons start in January. Why aren't you learning Chinese?
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>>8510477
>"their 'ethical inflexibility' has allowed us to make progress in areas they refuse to consider"
>>
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>>8510477
Damn it, i loved eating there, but now that i know what they're really doing, I guess I'll have to stop

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If you had the ability to 100% memorize and understand inside and out every textbook in your undergraduate curriculum would you be on the same level as a professor of that field?
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its true that a book is the authors ideas on paper (in case of some great novels such as 1984 or 451), but the case for academic textbooks that are meant to compile internet information into textbooks, so no, you will be not be smarter than your professor.
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>>8510353
>would you be on the same level as a professor of that field?
Is there an *undergraduate mathematics* field?
Having an eidetic memory would surely help you though.
>>
>>8510358
>terence_tao.jpg
that's serre retard

Let's talk QFT /sci/. Say I have a Lagrangian [eqn] \sum _{ j = 1 } ^{ 2 } \left [ \frac { 1 } { 2 } \partial ^{ \mu } \phi _j \partial _{ \mu } \phi _j - \frac { 1 } { 2 } m^2 _ { j } \phi ^2 _{ j } \right ] + \frac { \lambda } { 6 } \phi _1 ^3 + \frac { g } { 2 } \phi_1 \phi _2 ^2 [/eqn] And I need to compute the 4-point correlation function [eqn] \langle 0 | T \left [ \phi _1 ( w ) \phi _1 ( x ) \phi _2 ( y ) \phi _2 (z) \right ]| 0 \rangle [/eqn] Basically, how do I compute it? I've found the generating functional, [eqn] Z=e^ { \mathcal{ L }_0 + J_1 \phi _1 + J_2...
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x = (-b +/- sqrt (b^2 + 4ac)) / 2a :-)
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>>8510308
The only thing worse than cryptic answers from faggots trying to feel smart is wrong cryptic answers from faggots trying tob feel smart.

>>8510302
Figure it out for yourself, cunt.
>>
>>8510388
>cryptic answer
it's the quadratic formula retard
u didnt get le joke :^)

>what is energy?
>its not light, heat, matter, thats a result of energy
>energy is the transfer of motion
>universe requires prime mover to start motion
>prime mover is the source of "energy"?
>prime mover is an infinite regression paradox
>universe must be in eternal motion
>motion is realtive to the observer

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>what is the slippery slope fallacy?
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>>8510266
you started off by asking a good question and then proceeded to delve into deeper and deeper levels of inchoate shittery. Shame on me for thinking we might be able to discuss some SICK ontology
>>
Energy is the ability for a force to displace an object a certain distance isnt it? And forces are vector fields. So energy is the displacement in a vector field. I think

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Thread for batshit insane but theoretically workable ideas for solutions to global warming

My own:
>Invent a solar powered light panel: solar panel on one side, room light on the other, programmable maximum brightness
>Calculate the greatest area of these panels we can build with all the nonvital resources on earth
>Build that many
>Connect them in a spherical network covering the entire planet at the altitude where the ozone used to be

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>>8510265
(continued)
>Leave a section open for space travel
>Instead of discarding the excess energy, take it in and use it to power stuff
>Use the stuff thus powered to inexpensively build rockets
>Load the rockets up with any unusable waste or excess carbon emissions
>Launch as far into space as possible
>Replace lost planetary mass by...
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>>8510265
>>Invent a solar powered light panel: solar panel on one side, room light on the other, programmable maximum brightness

Also known as a window with blinds you fucking retard
>>
>>8510265

Step 1: reduce population
Step 2 : ???
Step 3: Profit

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>is it me or more Black people are getting into STEM related fields these day?
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>>8510035
>STEM related fields

So that's what you call your mom, huh?
>>
>>8510035
Yeah, before 0% of blacks got into university because it was illegal for them to have an education.

Now like 10% do because they are allowed to have an education.

Wow, changes in laws have effects in the real world?

Who would have known! I just thought laws were written as a competition of which party can pass the most laws.
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>>8510060
>implying the civil rights movement happened during Obama's Term

Jesus, people are out of touch.

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>tfw you share this planet with 8 billion people
>tfw only 1% of those people share the passion for true beauty in mathematics, physics,engineering and programming
>tfw rest of the world just wants to have fun
>tfw everyone cares about money
>tfw there are thousands of people that earn millions from youtube revenue because kids are watching them
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>>8509933
Nah, more like 10% +-5% but they hide it well because they don't want to look like autists and never have a gf

Just look at financefags at /biz/, they work with some company but they will just talk about investments instead of formulas and shit since that's part of their job but they still like it (i think)

Get into math clubs but there's a risk of too many autists to handle for you
>>
Honestly that's kinda what makes the world fun. I love people who like to have fun. The world would be boring as fuck if everyone had the exact same interests and goals.

So, as usual, OP is a faggot.
>>
>>8509933
>top tier mathematics and good-tier physics in the same sentence as faggot-tier engineering and low-tier programming
???

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bezos /ourguy/ will be the first to hit 1 trillion. he wants to get into asteroid mining and amazon will soon take over the retail world.
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>>8509852
This triggers the fuck out of /g/ though

Especially Ree Shat Is A Tall Man
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>>8509852
Hes not even a tenth of the way to 1 trillion
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>>8509881
asteroid mining will be huge

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What do some of you do for side income? Tutoring? Online courses on udemy?
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I work at a gas station at the moment, next month I start a programming job.
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>>8509829
CAD work
>>
Solidworks monkeying and writing articles for some hobby robotics magazines. I should be able to drop one of those once I start as a GTA next semester. I also used to work as a machinist and welder when I was in my undergrad.

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Is hooker sex different than real love sex? do different chemicals get released?
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>>8509778
surprisingly, yes. levels of intimacy.
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>>8509778
If you had ever had sex, you would know it's always different.
>>
We know from scientifical fact purposeless sex is bad for you
Neuro and cardiotoxic. Even masturbation. Plus god wont even love you

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How do I get into engineering? I want to know, because i'm thinking about taking it up and i've always been interested, but don't know where to begin.

Post recommended instructionals and books and shit.
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>>8509661
http://4chan-science.wikia.com/wiki/Chemical_Engineering
http://4chan-science.wikia.com/wiki/Nuclear_Science_and_Engineering
http://4chan-science.wikia.com/wiki/Mechanical_and_Aerospace_Engineering
http://4chan-science.wikia.com/wiki/Electrical_and_Electronics_Engineering
http://4chan-science.wikia.com/wiki/Computer_Science_and_Engineering
>>
>>8509753
Well of course there this. I was just hopping for good starter readings.
>>
>>8509661
For what end? If you are thinking about taking it up you should ask professors. I'm guessing you are in high school so you can also ask your science teachers about it.

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What I dont understand is, why are the stick figures smoking?
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opboted
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>>8509483
Because weed lmao
>>
why is 4 blue

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What would happen if I were right outside the event horizon of a black hole, stuck my arm past the event horizon, and tried to pull it back out?

Assume my body is tethered to something far away from the hole so I couldn't actually be sucked in.
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>>8509309
your arm would be ripped off

Even if your arm would be of the strongest metal known to man (diamond), it would be torn apart at the sub-atomic level. There is no rescue once it's passed the event horizon.
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>>8509309
You probably wouldn't feel anything. It's just a surface where even light can't escape.
>>
Daily reminder that black holes are hypothetical and that astrophysics is not a real science by any means.

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LaTeX general?

Who here uses latex for articles and assignments?

/{memoir}/ here myself
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>>8509269
Who the fuck doesn't? It's pretty much standard in my department for almost everything.
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>>8509275
>Who the fuck doesn't?
Filthy peasants a.k.a. non-scientists.
>>
We don't need a general for this

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We all now flat earth is bullshit but what about doughnut earth?

mathematically speaking its exactly the same but from another angle
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>>8509241
What about nicolas cage earth ?
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>>8509241
>Doughnut
Torus bro.
Torus Earth would be lit.
>>
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>>8509241
in out in out in out
oooooooooooooohhhhhhhhhhh!!!!!!!

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Why would one drug work when another very closely related drug had no effect? For example, why would nortriptyline be effective in treating one of its indications when amitriptyline wasn't? The only difference between the two is a missing carbon at the end of the nitrogen.

It's not like enantiomers where one might be more active because of its completely reversed structure.
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bumpu
>>
The missing carbon makes the molecule bind to its receptor more/less

???
>>
>>8509754
but in this case, the nortriptyline is the active metabolite of the amitriptyline. why would a purer form of the active metabolite have an effect when the prodrug did not?

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> energy is not created
> energy is not destroyed

Their called Newton's LAWS for a reason, because e laws can be broken. How else can you explain this?
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Dark propulsion

You wouldn't understand.
>>
>>8509031
It doesnt violate it

It uses the electricity to excite and shut photons out the rear

For about 100w you get something like 0.0001N of thrust
>>
IT'S A BRASS CONE
IT DOES NOTHING.

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Please share your best pics, webms, and videos that concisely exemplifies the stupidity of flat earthers and moon landing deniers.

>Not necessarily the best proof, simply looking for easily understood media that helps those who are ignorant enough to be undecided on these topics see flat earthers and moon landing deniers as reprehensibly idiotic.

Thanks in advance. It is a worthy cause.
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>OP thinks the Earth is spherical
>he probably thinks this is a a simulation either
kek
>>
>>8509024
Explain why the Moon and Sun have a constant size throughout their path accross the sky.
>Protip: you can't
>Expert advice: Castrate yourself.
>>
>>8509013
We are talking of people who are convinced all tourism to the south pole is one giant brainwashing-Illuminati-drug induced trip involving thousands of people and so on. Not gonna get anywhere with "proof" as they will just dismiss it as photoshopped swamp-gas propaganda.

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What are his biggest mistakes trying to explain that man made global warming is a hoax?
The other thread probably already discussed this but all serious responses are beneath a thousand of idiotic ones.
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>>8508942

Bloody fucking none !

Listen him and think again, and again until it sinks.
>>
>>8508942
Molyneux is a egoistical fruitcake. I don't really see the point of digging through his shit to find the worst parts.

>The other thread probably already discussed this but all serious responses are beneath a thousand of idiotic ones.
Welcome to /sci/.
>>
>>8510045
>Welcome to /sci/.
This.

Also, if you treat Molyneux as a biased radio host, you might start to enjoy some of his videos - he's still mostly full of shit and an egomaniac, but he has some good points.

One more thing: https://www.youtube.com/watch?v=C7XJIioZEgQ
THE BOND WAS STRONG ENOUGH THAT I DIDN'T FUCKING KILL HER
THAT'S MY FORGIVENESS

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What will be the proper name for people who build things using graphene?

We called metal workers blacksmiths, back in the day. Or goldsmiths. Or tinsmiths.

Will we just call people who make things out of graphene and carbon nanotubes.. Carbonsmiths?

Or chemists?

Or not have any word for technology that's made of carbon at all, just call them polymer makers, crystal makers and engineers?

I gotta know. Suppose the technology and availability was made so even a garage dwelling tinkerer could lovingly make computers or tools or whatever at...
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>>8508874
autistic semen slurpers
>>
Chemists obviously, dont be autistic please
>>
>>8508874
Inorganic monomer chemists

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Why can't anything go faster than "speed of light"?

Can't find any explanation for this, only some equations.
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I already know the "explanation"
>You need more and more energy to accelerate objects when they get faster, and to accelerate beyond c would require infinite energy

That doesn't explain ANYTHING. It's just a phrase that gets mimic'd by people "aware" of the "fact of nature".
>>
>>8508711
It's because of e = m*c^2.

When you get close to the speed of light, your mass rises exponentially. Due to this formula, moving requires even more energy, up to a point this energy is litteraly infinite.

Due to the nature of the equations behind e = mc^2, it's been estimated that nothing can go past the speed of light because it would simply weights too much to actually move.
>>
>>8508724
You use the word "infinite". As mass cannot be "infinite", never, ever, unless you believe in God or something, your argument must be invalid.

There must be some other reason why you can't accelerate beyond c.

As long as your mass is finite, you only require finite energy to accelerate. It is *impossible* to have an infinite mass. Therefore you can breach the speed of light quite easily. Q.E.D.

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Is it possible for a powerful enough supercomputer to plot the movement of all atoms in reverse to verify this number?
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No.
>>
>>8508682
No because it would have the plot the movement of all of the atoms inside itself that are plotting the movement of atoms elsewhere.

And then it would have to plot the atoms in itself that are plotting the movement of all the atoms inside of it that are plotting the movement of atoms elsewhere.

Then it would have to plot those atom's movement, using some other atoms.

And so on, infinitely.
>>
>>8508719
It does not have to do that, it would start at t=0 and move back, not plot in real time.

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>>8508428
If you need them you shouldn't be doing maths.
>>
>>8508428
The logic one is surprisingly good. Goes through natural deduction, truth table and trees including first order logic. Hurley doesn't even do that!
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linear algebra one


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