When all you have is an imaginary hammer, everything looks like a rotation around the imaginary unit circle.
Explanation of maths
x = -10, i = √-1 so i² = -1 and 10i²=-10
Conversing with Mathematicians
Submitted 9 months ago by fossilesque@mander.xyz to science_memes@mander.xyz
https://mander.xyz/pictrs/image/a25883e1-08bc-4293-affd-6e3e1f666d21.webp
Comments
Deebster@programming.dev 9 months ago
fx3@beehaw.org 9 months ago
IIRC, your spoilery “so” is the other way round. The right side is the definition, and the left-hand side a layman’s shorthand, as the root operator isn’t defined on negative numbers.
I might very well be wrong. My being a mathematician has been over for a while now, my being a pedantic PITA not though.
Deebster@programming.dev 9 months ago
I don’t know enough to know how correct your pedantry is (technically or not), but to explain the meme it made sense to go through the symbols in the order you see them. I never got any points from the proof questions in exams anyway.
NigelFrobisher@aussie.zone 9 months ago
Wait, isn’t x just -10 if x^3 is not 1000?
bi_tux@lemmy.world 9 months ago
yes, it is
iAvicenna@lemmy.world 9 months ago
that is a very long way to write -10
Yaysuz@lemm.ee 9 months ago
What an extremely unnecessary explanation. As a math teacher I would have deducted points for this answer.
androogee@midwest.social 9 months ago
“show your work”
Malicious compliance intensifies
Razzazzika@lemm.ee 9 months ago
Unless I was in that clas where we had to write mathematical proofs. I HATED those. Sure, you solved the question but write out this complicated reason for why your answer is the correct answer.
southsamurai@sh.itjust.works 9 months ago
My brain
It hurts
Cryophilia@lemmy.world 9 months ago
That’s because the explanation was about 10 times as complicated as it needs to be
mexicancartel@lemmy.dbzer0.com 9 months ago
He is trolling with overcomplicating
Ravi@feddit.org 9 months ago
No definition what values are suitable for x.
quicksand@lemm.ee 9 months ago
x has to be -10, right? Or am I missing something?
jacksilver@lemmy.world 9 months ago
Yeah, I think the point is that the person answering was wrong/over complicating. If x=10i, then x^2 would be -100 (or potentially -10 depending on what you think the ^2 is applied to).
Ravi@feddit.org 9 months ago
Depends on what are the allowed values for x are. Real numbers, complexe numbers, binary or I made up my own numbers ;)
WolfLink@sh.itjust.works 9 months ago
The answer in the meme (10i^2) is -10
Malgas@beehaw.org 9 months ago
Probably what they were going for, but there are literally an infinite number of exotic arithmetic spaces you could ask this question in. For example, x=10 works in any ring with a modulus greater than 100 and less than 1000.
Xavienth@lemmygrad.ml 9 months ago
Therefore i¹⁰ = ln(-1)¹⁰/pi¹⁰ = -1
This is true but does not follow from the preceding steps, specifically finding it to be equal to -1. You can obviously find it from i²=-1 but they didn’t show that. I think they tried to equivocate this expression with the answer for e^(iπ) which you can’t do, it doesn’t follow because e^(iπ) and i¹⁰ = ln(-1)¹⁰/pi¹⁰ are different expressions and without external proof, could have different values.
Dalvoron@lemm.ee 9 months ago
If we know the values of ln(-1)¹⁰ and pi¹⁰ we hypothetically could calculate their divided result as -1 instead of using strict logic, but it is missing a few steps. Moreover logs of negative numbers just end up with an imaginary component anyway so there isn’t really any progress to be made on that front. Typing ln(-1)¹⁰ into my scientific calculator just yields i¹⁰pi¹⁰, (I’m guessing stored rather than calculated? Maybe calculated with built in Euler) so the result of division is just i¹⁰ anyway and we’re back where we started.
Xavienth@lemmygrad.ml 9 months ago
You can find the value of ln(-1)¹⁰ by examining the definition of ln(x): the result z satisfies eᶻ=x. For x=-1, that means the z that satisfies eᶻ=-1. Then we know z from euler’s identity. Raise to the 10, and there’s our answer. And like you pointed out, it’s not a particularly helpful answer.
MonkderVierte@lemmy.ml 9 months ago
Can someone write this in Python, please?
TexasDrunk@lemmy.world 9 months ago
import math
pr06lefs@lemmy.ml 9 months ago
What about plain old
x = -10?-10 ^ 2 = 100 -10 ^ 3 = -1000 -10 ^ 5 = -100000
Redacted@lemmy.world 9 months ago
Isn’t that the joke?
Enkers@sh.itjust.works 9 months ago
That’s what he wrote, I imagine.
Siethron@lemmy.world 9 months ago
It is, but with imaginary numbets
JackbyDev@programming.dev 9 months ago
i² = -1 so…
thedudeabides@lemmy.dbzer0.com 9 months ago
Nothing gets past you eh?
pr06lefs@lemmy.ml 9 months ago
people being pedantic showoffs doesn’t really register as humor for me, TBH
dwindling7373@feddit.it 9 months ago
10 * i^2 is -10.
Abracadaniel@hexbear.net 9 months ago
of course, but this problem is solvable without any understanding of complex numbers, and 10*i^2 is a really clunky, multi-operation expression whereas -10 is just an integer.
simplifying one’s answers is standard practice and any grader who received the answer in the OP would be obligated to point out that while technically correct, they’re missing the basic fact that the answer is -10.
The Rube Goldberg comment is apt as the solution is absurdly complicated and overengineered for the task it performs.
aaaaaaadjsf@hexbear.net 9 months ago
Yeah exactly you’re right, why overcomplicate the problem like the Reddit comment did? I guess that’s just typical Reddit thinking that being pendantic and using lots of fancy words and long explanations makes you smart.
Krauerking@lemy.lol 9 months ago
Nah just boiler plate autism.
Deconceptualist@lemm.ee 9 months ago
That was my immediate thought too.
Sphks@lemmy.dbzer0.com 9 months ago
Boooooring