As an engineer I fully agree. Engineers¹ aren't even able to do basic arithmetics. I even cannot count to 10.

¹ Except maybe Electrical engineers. They seem to be quite smart.

Right? They got that shit backwards. Op is a fraud. i is used in pure math, j is used in engineering.

How do we know it's gay though? OP could be a girl (male)

The mathematician also used "operative" instead of, uh, something else, and "associative" instead of "commutative"

My thoughts exactly lol

That part also got me really confused. All the mathematicans I know use i while engineers use i or j depending on the kind of engineer. I've never seen a Pikachu engineer using anything other than j.

The fun starts when you study quaternions

i^2 = j^2 = k^2 = ijk = −1

I agree. Clearly i is current. What is this i=√-1 nonsense.

[Lapsed] mechanical engineering gang checking in. I was also surprised. Though, tbh, I think it came down to personal preference of the professor more than field-wide consensus.

a real mathematician would use (0, 1) instead of i

Thado-mathocist. The real chad all along.

It makes me wonder if somewhere out there in a multiverse, a community of lisping incels all collectively draw the chad wojak as as an aramaic looking dude.

Well done, truly

I’m a mechanical engineering student with a math minor and I’m a switch so yeah, I’d take either side of this

As an EE, I used both. Def not a mathematician though. Fuck that, I just plug variables into programs now.

imaJinary

TIL engineers can't spell for shit.

The associativity thing also doesnt make sense.

Engineer here: mostly use i, but have seen j used plenty. First time I saw j used was by a maths professor.

This one made me laugh almost as much as the OP. Thank you!

no, d..do you have a plan?

Something something distance calls for norm, not just squares.

||i||² + ||1||² = 2

Imagining your death. :P

But seriously, it's perfectly sensible when remember that i is just the mathematical representation of "left turn", just like -1 is the mathematical representation of "go backwards"-- and as we know, two left turns sends you backwards. So think about this triangle in the following way:

Imagine you are a snail, starting at the origin. Now imagine that you walk forward 1 step along the horizontal line. Then you turn 90° to the left to start walking along the vertical line, but then, because you need to walk i steps along this line you take another 90° turn to the left, which means that you are now walking backwards and you end up back at the origin. How far away from the origin are you? Zero steps.

😏

As a software dude I can see you wrote a regex, I just can't find out what you're trying to match.

hehe plot. getit? math and graphs and shit

The only thing I can think of is that the OP studied electrical engineering at some point. But it's a 4chan story so probably fake anyway.

I think it might be the wrong way around: Engineers like to use j for imaginary numbers because i is needed for current.

Mathematicians are taught to be elastic with notation, because they tend to be taught many different interpretations of the same theory.

On the other hand engineers use more strict and consistent notation, their classes have a more practical approach.

Using the same notation makes it faster to read and apply math, a more agile approach helps with learning new theories and approaches and with being creative.

Web dev here. "Huh?"

If not fraction, why fraction shaped?

I just think of the definition of a derivative.

d is just an infinitesimally small delta. So dy/dx is literally just lim (∆ -> 0) ∆y/∆x. which is the same as lim (x_1 -> x_0) [f(x_0) - f(x_1)] / [x_0 - x_1].

Note: ∆ -> 0 isn't standard notation. But writing ∆x -> 0 requires another step of thinking: y = f(x) therefore ∆y = ∆f(x) = f(x + ∆x) - f(x) so you only need ∆x approaching zero. But I prefer thinking d = lim (∆ -> 0) ∆.

But the post says before the integral, so I understand what they did would be $dx \int f(x)$, which is disgusting