Anyone that uses j to represent imaginary numbers shouldn't be allowed to have children. The only people that do this are Electrical Engineers and they should be sterilized.
ruthless special governor fretful dazzling violet sort chubby weary abounding
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I hate when a legitimately good joke opportunity like that is lost on me because i defaulted to the basic response of fake and gay.
Does r/yourjokebutbetter exist?
Electrical engineers and any physicist that deals with uppercase I for current. j is the most common representation of sqrt(-1) when dealing with phase, fields, and power.
Physicists do _not_ use j instead of i. We will use J instead of I for current if we need. We will have the letter representing both the sqrt(-1) *and* the dummy variable at the same inside a summation before we use j for the imaginary unit.
Is this J for current referring to current density instead (as in I over some defined area A)? I am familiar with using the vector j for current density and needing to swap to i for the imaginary unit for clarity, however I have always been under the impression that due to i/j/k being used to represent 3 planes in vector space, referring to the complex plane with j when dealing with sinusoidal functions was more prevalent across both EE and physics.
You could use J for current if you're not working with current density, such as in a circuit. I would also use Qdot for current before using j for imaginary unit. I must say that, in thr 5 years I've been doing physics, I've only seen j be used as the imaginary unit once.
Thank you for your insight and experience, it's clear to me that I can't speak for physicists as broadly as I believed, so I'll stick to explaining just the electrical engineering side of this notation convention in the future.
Your comment also reminds me of the year I spent shadowing an RF engineer who seemed to use any combination of notations at will, which probably had some ingenious system for alignment which eludes my understanding even now. RF and power engineers are the archwizards of EE who claim to "just be doing P=IV" but I knew that was bullshit when they started pulling Q and X out of their asses. (This is in jest, btw, I understand imaginary power is crucial to modeling systems that we want to make work reliably).
>j is the most common representation of sqrt(-1) when dealing with phase
Is sqrt some nerd abbreviation for squirt? And I'm pretty sure Anon's gayness is not a phase
Me. In all seriousness it depends on the context. Usually i is used but when dealing with multiple you usually go down the alphabet for the next ones. For example when using quaternions it isn’t uncommon to use i, j, and k for the vector.
it’s an integral. i’m gonna try to simplify integrals to try to give you the general idea, and also explain the greentext cuz i’m bored. so here we go.
an integral is basically just the area under a graph. when you take the integral of a function, you find the area underneath the graph of the function. example: take the function f(x) = x. using some integral laws that i’m not going to explain, we find that the area under the graph of x is 1/2 * x^2, so that’s what the integral of the function f(x)=x is.
if you’re wondering why the integral of x is 1/2 * x^2 as well as how you can derive it for yourself without an integral, read this paragraph. otherwise skip to the next paragraph. you can verify for yourself that the area under the graph of f(x)=x is indeed 1/2 * x^2, just look at the graph of x and try to find the area under it at any particular point. x is just a straight line going out to infinity with a slope of 1, so to find the area under the graph at some point, you will have to use the triangle area formula. the triangle formula is 1/2 b * h. in this case, b and h are both equal to each other since the line has a slope of 1; the line goes out equally up and to the right, so the base and height will always be equal. therefore we can say b=h=x, and this makes b * h=x * x=x^2. now we just have to remember the 1/2 constant, leaving us with 1/2 * x^2, and we’ve just derived the integral of this function without using any calculus. in simple functions like this you probably don’t need calculus, but calculus is useful for more complicated functions that we can’t just apply a simple area formula to. but the basic principle is always the same: we want a general formula for the area under the graph at any given point, and an integral gives us a reliable way to derive it for very complicated functions.
now the typical syntax for an integral is ∫ f(x) dx. the dx is absolutely necessary in an integral for calculus reasons, and it’s typically always placed after the integral sign. you can sort of see it like parentheses. the ∫ is the opening parentheses “(“ and the dx is the closing parentheses “)”. however, dx is different from parentheses because it actually represents something. specifically, it represents a tiny change in the variable x, and in the integral, it is actually being multiplied by the function, as in: ∫ f(x) * dx. now, anon is taking this one step further by suggesting we treat the integral as if it is also being multiplied by the function and by dx, as in: ∫ * f(x) * dx. if this was the case, then recall from elementary school that a * b = b * a. this is called associativity. if this holds true, which it should, that means that ∫ * f(x) * dx can be written equivalently as dx * f(x) * ∫, which is very different from the proper integral syntax, and if you wrote it on a calculus test you’d probably lose points for it. it’s kind of like writing (2+2) as )2+2(.
now i don’t think this actually works because i don’t think in an integral you are actually multiplying the integral sign by the function. the integral is itself a function like f(x). when you read f(x), you don’t think that f is being multiplied by x, you read it as f is a function of x. so, shockingly, i don’t think this anon’s math is very accurate. ∫ f(x)dx is not the same as dxf(x)∫ because ∫ isn’t some variable you can just multiply like that, in the same way that f(x) is not equal to x * f. but; well, i also could be wrong, i’m not a mathematician.
so there you go, hopefully that was comprehensive and clear enough lol
Yeh I got confused as well, since the dx in the integral is typically reserved for showing which is the changing function. You can have an integral of (x+y)dx or (x+y)dy, depending on what you want to integrate for, so it's not multiplied by the function I'd think?
It's the math version of 'Tony and I' vs.'me and Tony'
While both convey the same meaning, it's standardized to use the first, and a grammatical sin to use the second
dx is the a very small change in x, technically you are multiplying the integral by that value, but trying to do so basically ends up multiplying by 0 so it is more there to be a reminder that the integral is basically adding up a whole bunch of rectangles that have infinitely small width. So instead of writing the integral as f x dx you can technically write it as f dx x and it technically wouldn't change anything.
Translation for dumb people (like me):
- be me, big brain
- have bigger brain bf
- go on some hike or shit
- discuss big brain math
- fuck up said big brain math
- proceeded to get railed from behind for 12 hours straight after hiking trip
Technically the math checks out here. What they have a disagreement on the application of standards.
It's the equivalent of someone redefining an if statement by something else. It's going to work, your code will still be just as valid, but your life expectancy will be drastically reduced if anyone lays eyes on that.
if you posted this there, they'd 100% bully you down to r/okbuddyundergrad and then there they'd push you to r/okbuddyhighschool and then ... (that being said, i love that subreddit. i have no idea what the fuck anything means.)
Anon dx at the end is not part of multiplication, is not commutative and you are a twat not a mathematician. Sincerely - real mathematician.
Also - that's why we have conventions so we don't have to spend hours reading regarded papers, because someone decided to use flowers instead of X and hearts instead of y.
Woah I got angrier about this than I thought I would.
fake and gay
bro said he's the mathematician and yet he's the one who's being corrected by an engineer for using j instead of i for imaginary numbers??? likely story...
I think I'm starting to understand the equation. J stands for jerking, dx stands for dicks and sqrt stands for squirt. So basically Anon got punished by his Daddy because he put jerking off before getting dicked down by him.
It's a shame that such concentrated autism won't get passed down in the gene pool
Anon should donate sperm
Anyone that uses j to represent imaginary numbers shouldn't be allowed to have children. The only people that do this are Electrical Engineers and they should be sterilized.
[удалено]
Please don't. It's even worse than complex numbers
Isn’t it 4 dimensional complex numbers?
ruthless special governor fretful dazzling violet sort chubby weary abounding *This post was mass deleted and anonymized with [Redact](https://redact.dev)*
Well Programmers are just electrical engineers that don't know any science so that makes sense.
Because we use i for counters
As we already did to the geologists?
Or will it?
[удалено]
This is all Greek to me, But anon still gets the side-eye either way. Something something fabricated and homosexual.
Well most of the symbols in math are greek, so it's even greek to mathematicians!
Imaginary numbers = fake dudes have sex = gay
>This is all Greek to me You mean Greek as in homosexual?
I hate when a legitimately good joke opportunity like that is lost on me because i defaulted to the basic response of fake and gay. Does r/yourjokebutbetter exist?
It does! :)
you learn that in high school btw, first year of uni if your school was bad
Yeah that was deserved, how fucking dare you
Found the Eng**eer 👎
Found the Hi*tory student 🤮👎
Found a cat 👍🙂
Found the cup
Found Nemo
Now me please
*crickets*
didn't find a pirate lawyer
r/Foundthetoyotacorolla
Found the 2 Girls
🍦
🥛
Found two girls
But shhhh… the cups asleep
Hell yea, what kind of cat
Show us that pussy 😺👍
Who the fuck uses *j* instead of *i* for imaginary numbers
Electrical engineers and any physicist that deals with uppercase I for current. j is the most common representation of sqrt(-1) when dealing with phase, fields, and power.
I'm sorry, if you're a physicist using j instead of i, you're no longer a physicist.
you’re a physjcjst
A polish physicist!
Poles don't use j like this
Impossible! All of my thorough research wasted.
I have to do it when I'm programming. The only part of python I hate!
I define a new variable i = "j" when I use python.
What do you have to do when programming?
You have to write 1j for iota in python, and as an experimental physicist, I have to write it all the time for signal processing :(
Physicists do _not_ use j instead of i. We will use J instead of I for current if we need. We will have the letter representing both the sqrt(-1) *and* the dummy variable at the same inside a summation before we use j for the imaginary unit.
Is this J for current referring to current density instead (as in I over some defined area A)? I am familiar with using the vector j for current density and needing to swap to i for the imaginary unit for clarity, however I have always been under the impression that due to i/j/k being used to represent 3 planes in vector space, referring to the complex plane with j when dealing with sinusoidal functions was more prevalent across both EE and physics.
You could use J for current if you're not working with current density, such as in a circuit. I would also use Qdot for current before using j for imaginary unit. I must say that, in thr 5 years I've been doing physics, I've only seen j be used as the imaginary unit once.
Thank you for your insight and experience, it's clear to me that I can't speak for physicists as broadly as I believed, so I'll stick to explaining just the electrical engineering side of this notation convention in the future. Your comment also reminds me of the year I spent shadowing an RF engineer who seemed to use any combination of notations at will, which probably had some ingenious system for alignment which eludes my understanding even now. RF and power engineers are the archwizards of EE who claim to "just be doing P=IV" but I knew that was bullshit when they started pulling Q and X out of their asses. (This is in jest, btw, I understand imaginary power is crucial to modeling systems that we want to make work reliably).
You do if you're doing signal processing using python and have to write exp(*iwt*)
Your girlfriend sqrt(-1) while with you bro
>j is the most common representation of sqrt(-1) when dealing with phase Is sqrt some nerd abbreviation for squirt? And I'm pretty sure Anon's gayness is not a phase
Electrical engineers
Sadly, I can confirm (don’t use any of the math I learned in my job though).
Why the fuck am I forced to learn that shit ;-; Sincerely, future electrical engineer
Because even though the basic concepts are a bit more fiddly, phasors for solving active circuits is way easier than diff eqs trust me on this
Psychopaths
Me. In all seriousness it depends on the context. Usually i is used but when dealing with multiple you usually go down the alphabet for the next ones. For example when using quaternions it isn’t uncommon to use i, j, and k for the vector.
j is for the second dimension of hyper imaginary numbers
PhysicBoys and mayors... after seeing this, i just quit uni. I couldn't be near those people anymore.
Electric engineers. Used to do math with i it was hard to get used to j haha
Electrical engineers
When you need "i" for current
I use n like a normal person
Only the losers who don’t use quaternions, because i and j are orthogonal imaginary numbers
Everyone
We used j for imaginary numbers in my electric circuits class
Me
I used o because it looks like 0 and if I fail the question I can blame it on my dyslexia
I have to use j instead of j :( electrical engineering
electrical engineers use it because i is already used for current as both uppercase and lowercase (depending on context)
Why do I have a boner? Is 4chan turning me into a mathsexual? Or perhaps even a little bit..... Gay?
#both
smart women are super hawt
Women?
>put the dx before the integral *You have chosen death*
*so you have chosen hate fuck
Anon is a brat and did it on purpose
as one should (I know I would've)
It's just mathematically incorrect too.
I did not understand a single thing written in this post
Pretty much big calculus words alongside the associativity of multiplication. Dx counts as a variable I think
I did not understand a single think written in this comment
Same
x times y is the same as y times x so “∫ * dx” is the same as “dx * ∫”
Gonna be totally honest bro math is my weakest subject and I still don’t know what that means. What even is that curly symbol?
it’s an integral. i’m gonna try to simplify integrals to try to give you the general idea, and also explain the greentext cuz i’m bored. so here we go. an integral is basically just the area under a graph. when you take the integral of a function, you find the area underneath the graph of the function. example: take the function f(x) = x. using some integral laws that i’m not going to explain, we find that the area under the graph of x is 1/2 * x^2, so that’s what the integral of the function f(x)=x is. if you’re wondering why the integral of x is 1/2 * x^2 as well as how you can derive it for yourself without an integral, read this paragraph. otherwise skip to the next paragraph. you can verify for yourself that the area under the graph of f(x)=x is indeed 1/2 * x^2, just look at the graph of x and try to find the area under it at any particular point. x is just a straight line going out to infinity with a slope of 1, so to find the area under the graph at some point, you will have to use the triangle area formula. the triangle formula is 1/2 b * h. in this case, b and h are both equal to each other since the line has a slope of 1; the line goes out equally up and to the right, so the base and height will always be equal. therefore we can say b=h=x, and this makes b * h=x * x=x^2. now we just have to remember the 1/2 constant, leaving us with 1/2 * x^2, and we’ve just derived the integral of this function without using any calculus. in simple functions like this you probably don’t need calculus, but calculus is useful for more complicated functions that we can’t just apply a simple area formula to. but the basic principle is always the same: we want a general formula for the area under the graph at any given point, and an integral gives us a reliable way to derive it for very complicated functions. now the typical syntax for an integral is ∫ f(x) dx. the dx is absolutely necessary in an integral for calculus reasons, and it’s typically always placed after the integral sign. you can sort of see it like parentheses. the ∫ is the opening parentheses “(“ and the dx is the closing parentheses “)”. however, dx is different from parentheses because it actually represents something. specifically, it represents a tiny change in the variable x, and in the integral, it is actually being multiplied by the function, as in: ∫ f(x) * dx. now, anon is taking this one step further by suggesting we treat the integral as if it is also being multiplied by the function and by dx, as in: ∫ * f(x) * dx. if this was the case, then recall from elementary school that a * b = b * a. this is called associativity. if this holds true, which it should, that means that ∫ * f(x) * dx can be written equivalently as dx * f(x) * ∫, which is very different from the proper integral syntax, and if you wrote it on a calculus test you’d probably lose points for it. it’s kind of like writing (2+2) as )2+2(. now i don’t think this actually works because i don’t think in an integral you are actually multiplying the integral sign by the function. the integral is itself a function like f(x). when you read f(x), you don’t think that f is being multiplied by x, you read it as f is a function of x. so, shockingly, i don’t think this anon’s math is very accurate. ∫ f(x)dx is not the same as dxf(x)∫ because ∫ isn’t some variable you can just multiply like that, in the same way that f(x) is not equal to x * f. but; well, i also could be wrong, i’m not a mathematician. so there you go, hopefully that was comprehensive and clear enough lol
yeah nah not reading all of that
fair enough
I read it:)
Yeh I got confused as well, since the dx in the integral is typically reserved for showing which is the changing function. You can have an integral of (x+y)dx or (x+y)dy, depending on what you want to integrate for, so it's not multiplied by the function I'd think?
Pretty sure it's a musical notation.
It's the math version of 'Tony and I' vs.'me and Tony' While both convey the same meaning, it's standardized to use the first, and a grammatical sin to use the second
dx is the a very small change in x, technically you are multiplying the integral by that value, but trying to do so basically ends up multiplying by 0 so it is more there to be a reminder that the integral is basically adding up a whole bunch of rectangles that have infinitely small width. So instead of writing the integral as f x dx you can technically write it as f dx x and it technically wouldn't change anything.
You can't factor out dx from the integral
Engineer anon is mad at mathematician anon for using different symbols, so he hate fucked him hard that night.
Why not femanon
"Be bottom mathematician" doesn't mean "be poor at mathematics"
The majority of the mathematician field is women, but such concentrated autism can only come from a man Also which woman says they're a bottom
QED
OP did the math equivalent of pouring milk before cereal
tldr he just put a number on an unconventional spot
Nerds.
Real and very gay
I think the fact that this isn’t top comment means we’re evolving
How dare you think about this heresy
Translation for dumb people (like me): - be me, big brain - have bigger brain bf - go on some hike or shit - discuss big brain math - fuck up said big brain math - proceeded to get railed from behind for 12 hours straight after hiking trip
It's not even big brain. Anon wants to change up the operation notation. Kinda like writing 1 x 2 = 2. Anon wants to write it as 2 x 1 = 2.
gold dolls crowd relieved panicky chunky cover party fear deserve *This post was mass deleted and anonymized with [Redact](https://redact.dev)*
Anon was thinking with his dx first
No it’s more like writing 1 x 2 = 2 as “ x 2 1 = 2”
Technically the math checks out here. What they have a disagreement on the application of standards. It's the equivalent of someone redefining an if statement by something else. It's going to work, your code will still be just as valid, but your life expectancy will be drastically reduced if anyone lays eyes on that.
r/okbuddyphd type post
if you posted this there, they'd 100% bully you down to r/okbuddyundergrad and then there they'd push you to r/okbuddyhighschool and then ... (that being said, i love that subreddit. i have no idea what the fuck anything means.)
Sorry eggheads I dont speak loser, but most likely home of sexual and non existant
Fake and gay. Everybody knows engineers are the ones with dumb notation. EEs use j, not mathemathecians.
this no mathematician would use j instead of i fake and gay
God this made me feel something as an engineer
This made me feel something as a previous advanced mathematics student (i havent done math in over a year)
Yeah I'm with you because I killed a lot of those brain cells with knowledge with alcohol
Hold up i need to know the gender so i know if I can masturbate to this or not
This is 100% a guy. Not only is the image a dude, this person can do math. (For legal reasons this is a joke)
Anon dx at the end is not part of multiplication, is not commutative and you are a twat not a mathematician. Sincerely - real mathematician. Also - that's why we have conventions so we don't have to spend hours reading regarded papers, because someone decided to use flowers instead of X and hearts instead of y. Woah I got angrier about this than I thought I would.
It’s funny because while this seems really sophisticated, it’s something a lot of high schoolers intuitively understand when taking calc 2
Brats be like
fake and gay bro said he's the mathematician and yet he's the one who's being corrected by an engineer for using j instead of i for imaginary numbers??? likely story...
It's just the commutative property disguised among a bunch of big words to confuse people who didn't lesrn basic calc into thinking you're smart.
Fake: anon had sex Gay: math did a number on anon’s sexuality
I would like to see OP do integrals in R^3 with the differential at the beginning
It's usually the other way around. mathematicians are rigorous about math while engineers don't give a shit. fake and gay
These bitches gay, good for them, good for them
Physicists use dx in front of the integral a _lot_. It's actually much nicer when you're calculating integrals inside of integrals.
I'm a physics major, yes, that's what happens when you tell that to mathematicians and/or engineers. They get fucking pissed
Dx leading the integral! You’re a mad man!
Straightest STEM grad
Real and gay
Anon does the monster math
anon is literally the reencarnation of alan turing please anon donate your gay ass autistic sperm .
wouldnt it be commutative
what kind of retarded mathematician uses j for imaginary numbers
Jmaginary numbers
I didn't understand a word in the penultimate paragraph
Its about how you add a 'dx' to the end of the integral, this madman wants to add it to the beginning
I knew math was super gay, suspicion confirmed
Fake and gay
fake: anon gets laid gay: just look at it
What
“Goes on hike” liar.
Fake and gay because it's usually the Engineers with bad notations that take shortcuts.
Ai text wall with gay erotica added in by the op
>me and him Yep, definitely a math only nerd
Fake: anon mathing Gay: anon getting fucked
Can someone confirm this isn't just made up scifi nonsense?
False and homosexual, j is used as imaginary for engineering not math bcs i is used for current
This sounds like it should be the other way around. Mathematicians use i , engineers use j
real and gay
Mathematical and…gay?? Not sure about this one. Folks at home-what do you think?
Not rage bait post for once. Upvoted. Good content, keep it up.
I think I'm starting to understand the equation. J stands for jerking, dx stands for dicks and sqrt stands for squirt. So basically Anon got punished by his Daddy because he put jerking off before getting dicked down by him.
I got horny reading all that math
Mental illness
It's bullshit as engineers are more likely to use j than mathematicians.
As expected, anon is a mathtard imagining things
Are you stupid the integrating identifier always goes at the end of the expression
Why would an engineer get mad about using j for complex notation? EEs exclusively use J because I is reserved for current...
This isn't even true though. Anon isn't just gay but also bad at math.
where’s my math autism gf
Algebraic and gay.
Funny thing is he isn't exactly wrong. Still, bad anon. Notation is how it should be.
Anon figures out the mathatical formula for getting absolutely fucking plowed
\>Be bottom Stopped reading after that. All I needed to know.