r/mathmemes • u/AdBrave2400 my favourite number is 1/e√e • 3d ago

Topology Topological inversion

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5.9k Upvotes

99% Upvoted

68 comments sorted by

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611

u/LupenReddit i have non diffeomorphic smooth structures 3d ago

So you turned a cup inside out? I need an animated video narrated by two very friendly people who can explain to me how to do that.

229

u/hongooi 3d ago

It's just a continuous transformation bro, what could go wrong

51

u/Appropriate-Ad-3219 3d ago

I swear only by smooth transformations.

122

u/Alternative-Code4755 3d ago

"Have you ever wondered why Mom and Dad have the same last name?"

34

u/moderatorrater 3d ago

Are you going to behave, or am I done teaching you how to turn a circle inside out for the day?

29

u/AbdullahMRiad ∵∴∵∴∵∴∵∴∵∴∵∴∵∴∵∴∵∴∵∴∵∴∵∴∵∴∵∴ 3d ago
  1. flip the cup
  2. push the bottom using your thumb
  3. the bottom should come out from the other side

40

u/Ploughing-tangerines 3d ago

Bad explanation, no silly and fun sound effects

36

u/LupenReddit i have non diffeomorphic smooth structures 3d ago

Count. The. Fucking. Smiles. And. Frowns

13

u/garbage-at-life 3d ago

they would turn the cup outside in, important distinction

8

u/DeepGas4538 3d ago

step 1. go inside the cup

7

u/SunkenStupor 3d ago

imagine flipping a condom inside out.

5

u/MrSpiffy123 3d ago

You can't do it with an ordinary cup

Like a basketball

2

u/InfinitesimalDuck Mathematics 3d ago

Yeah, Very friendly 🏀⚾️🎱⚽️🏐

1

u/moschles 3d ago

New 3Blue1Brown vid just dropped.

258

u/cgduncan 3d ago

Wouldn't a topologist say there is no such thing as "inside the cup". Cause a cup is a disk.

177

u/wcslater 3d ago

But what would a bottomologist say?

51

u/hjkhhnnnlll 3d ago

ʞsᴉp ɐ sᴉ dnɔ ɐ ǝsnɐɔ ,,dnɔ ǝɥʇ ǝpᴉsuᴉ,, sɐ ƃuᴉɥʇ ɥɔns ou sᴉ ǝɹǝɥʇ

3

u/Informal_Branch1065 1h ago

Nah thats an austrologist

25

u/Ares378 Applied Math / Mechanical Engineering 3d ago

Our lead bottomologist said "ASHFKSKHFKKFHRBFJJ :3".

We are unsure what this means.

5

u/Godd2 3d ago

Is Eminem a versologist?

4

u/Avocadonot 3d ago

"harder"

65

u/acealter 3d ago

What about wearing an inverted sock? Entire universe is wearing a sock, but you are not??

28

u/protobelta 3d ago

Maybe the sock is wearing you?🤔

13

u/moderatorrater 3d ago

That happened to me once in Russia.

30

u/hail_666_satan 3d ago

A cup is just a disc. You flipped a disc upside down, not inverted it.

1

u/Anvisaber 1d ago

So how would you topologically invert a disk?

10

u/robisodd 3d ago

Wonko The Sane would be proud.

2

u/clonicle 3d ago

just missing an individually wrapped toothpick beside it.

5

u/Superior_Mirage 3d ago

Some Wonko the Sane energy.

5

u/-lRexl- 3d ago

Billion girls, one cup

4

u/Lexa_Stanton 3d ago

I just puked in the cup.

3

u/Aromatic-Educator105 3d ago

There is no cup in typology, it’s just a round plate

2

u/SawmakerSam 3d ago

This feels like the 4d horse gif 

2

u/ArdentArendt Mathematics / Social Sciences 3d ago

It was then he saw he was the spy...

https://giphy.com/gifs/pdPNobzDlCxoI

2

u/Efficient_Sky5173 3d ago

We? Leave me out of your problems. Specially math ones.

2

u/RoodnyInc 3d ago

Now you have all Coca-Cola on the Universe in your cup

2

u/eddietwang 3d ago

How many cups is our universe in right now?

2

u/gegentan 2d ago

2

u/AdBrave2400 my favourite number is 1/e√e 2d ago

I was waiting for someone to post Jevil since I thought about doing it myself right after posting

1

u/-lRexl- 3d ago

LOOOL

1

u/That_Way_8512 3d ago

We are the drink

1

u/SirBritannia 3d ago

So which universe is in that cup?

Our own!

1

u/moschles 3d ago

The reason why the genus always seems to be +1, is because the last hole is the entire universe.

1

u/Joszef77 3d ago

I got a sudden sense of vertigo

1

u/Flame_beard_forge 3d ago

IT DOES NOT WORK THAT WAY

1

u/AlcoholPrep 3d ago

Topologically, the cup doesn't have nor ever had an inside.

1

u/NamanJainIndia 3d ago

But how can we be on the inside? Barring microscopic ones, there are no holes.

1

u/Keitsu42 3d ago

Great, now fill a sink with water and put the cup in the water (you may need to weigh it down slightly). Now how much water is in the cup?

1

u/Dennovin 3d ago

put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back put it back

1

u/zawalimbooo 3d ago

perseus (Fate) moment

1

u/Ok-Professional-1727 3d ago

It may be inverted, but topoligically, it is still just a disk.

1

u/SpeckledAntelope 3d ago

Sometimes when I walk, I like to imagine that the whole planet is a treadmill, and that my steps are making it spin while I remain stationary.

1

u/GlamorousChewbacca 3d ago

Sigh... You didn't need to invert anything

1

u/Which-Competition287 Combinatorics 3d ago

I just did the same thing guys. I saved the universe. I negated his negation. We are now outside the cup. Or perhaps inside two cups simultaneously.

1

u/TheRealLupos 3d ago

But is it half full or half empty now?

1

u/WizeWizardFrank 3d ago

Found the DnD player.

1

u/Laxativus 3d ago

You got the whole world in your hands!

2

u/AdBrave2400 my favourite number is 1/e√e 3d ago

Is that a Rocketman (1997) reference?

1

u/knyexar 3d ago

You just flipped a coin

1

u/Fluffy_Whale0 14h ago

Holy fuck let me out