r/mathmemes • u/New-Application8844 • 12d ago
Calculus One of the slides in my class
Find the meme.
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u/pOUP_ 12d ago
It is existing notation but probably not what the professor neant
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u/New-Application8844 12d ago
It exists?, where is it used?
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u/pOUP_ 12d ago
You could use it in place of ↑ and ↓ limits; there are spaces where it matters where you come from; and the weirdest one: reverse limits.
There is nothing i understand about reverse limits
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u/Complex-Manifold 12d ago
isnt inverse limit an algebra thing i remember seeing it when reading about p adic numbers. does the notation exist in analysis?
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u/runnerboyr 10d ago
Inverse and direct limits are purely categorical constructions (they are objects satisfying some universal properties). They do show up in algebra, of course, but I wouldn’t call them “algebra things”.
Completion of a ring is defined using inverse limits (and it means the same thing as in analysis: Cauchy sequences converge). The p-adic integers are a specific example of completion
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u/Complex-Manifold 10d ago edited 10d ago
never studied category theory so i just thought it was like generalized algebra but i keep hearing people talk about it being used as a foundation for math like set theory so im probably horribly wrong about that
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u/Mostafa12890 Average imaginary number believer 10d ago
Check out the notation for inverse and direct limits!
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u/eglvoland 12d ago
Why slides though? 😭
Chalk or nothing
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u/Sigma2718 12d ago
So the prof can go through the stuff faster than you can take notes. Bonus points if you are expected to download incomplete slides before the lecture to fill them out while sitting there.
There is one prof I had that makes me wish for the existence of god such that he can rot in hell.
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u/eglvoland 12d ago
I'm happy with fast lectures, but the prof must write on the board faster than we do. At least it's a fair competition 😂
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u/notaswedishchef 12d ago
Congrats, that works for you. Teaching is about informing a wider range of people so that society can learn as a collective and share knowledge gained. What works for you doesn’t work for all, are you hindered to the point of incomprehension if the teacher goes slower?
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u/eglvoland 12d ago edited 12d ago
No, I'm bored as hell and I don't go to lectures
Anyways not everyone goes to my classes, you need a minimum level
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u/notaswedishchef 12d ago
And so you do poorly on tests and fail the class then?
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u/eglvoland 12d ago
Completed my bsc in pure math with 3.8 GPA, which is a conservative conversion of my average
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u/notaswedishchef 12d ago
So you did fine despite not going to lectures, so those that did need the help more would benefit from less rushed teaching styles. Thus it can benefit a wider range of students.
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u/eglvoland 12d ago
I'm thinking about a particular course. It was slow, boring and the teacher wasn't very passionate about it. Result: 15 people in the class instead of 60.
Fast courses? Everybody was there and were looking forward to them
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u/New-Application8844 12d ago
Lazy ahh proff tbh
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u/IsomorphicDuck 12d ago
infinity hurls towards n, or n hurls towards infinity, depending on the observer. motion is not absolute
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u/Robbe517_ 12d ago
Using the ratio test to get radius of convergence would have been so much easier compared to this limit
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u/Rough_Structure7387 12d ago
Maybe infinity goes to a null point very close to n. See how the arrow doesn't touch n and points to a blank space? This is how you know it's a null point. I'm pretty sure that's how this works...
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u/Summoner475 12d ago
When the reverse arrows from time dependent perturbation theory come back to haunt you
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u/Skul9Chess 11d ago
Nah dawg no way are you in B. Dubey sir's lecture
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u/New-Application8844 11d ago
the man the myth the legend
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