How many holes does a donut have?
Now make the donut higher. A lot higher. Now you have a donut-tunnel. Now make the walls thinner. Now shrink it. Now you have a straw.
One hole.
Mathematically It's one. Think of a disk, like a CD, does it have one hole or two? One, right? Now imagine you can make it thicker, I.e. increase the height, and then reduce the outer radius... Making it progressively more straw-like. At what point does it stop having 1 hole and begin to have 2?
Topologically they're the same shape.
I'm sure Matt Parker has a video on this topic in YouTube. Here
Classic topology question. Absolutely one hole; it goes all the way through.
Of course, connotatively, two is a fine assessment, but not in topology.
How many holes does a donut have? Now just try to image the real difference between a straw and a donut. Is there one, aside from deliciousness?
how many holes does a donut have? one. a straw is just a tall plastic donut.
two holes... smdh... kids these days
A straw is geometrically the same as a circular piece of paper with a z depth of zero and a hole in the middle. Because the z depth is zero there is only one hole. As you add thickness the one hole remains. Therefore, a straw has one hole.
It has two exits, one hole.
If you drill a hole in a block of wood you create one hole not two, note that whether or not the drill exits the opposite side, only one hole has been created despite differing numbers of exits.
What if you drill through a book?
You'll be banned from the bookstore
I believe the confusion lies in the word "holes" when you are thinking about openings or exits. Just my 2 cents.
Yes, I agree. "Hole" is poorly defined. This isn't a technical question about straws but a technical question about language.
That's the gist of practically all philosophical thought experiments.
When is a heap of sand no longer a heap? I dunno, define "heap" and there's your answer. It's not going to be a useful answer though because the rest of the world doesn't define the word with enough precision for the question to be meaningful in the first place. There is no authority on Earth that can do that. You can define the problem in precise mathematical terms but then it will NOT be the same thing as a plain-English "heap" and you'd be pulling a fast one if you acted like it was.
One of course, what a weird conversation to have.
1 'hole' if you can call it that. Imagine if the straw started life as a solid cylinder and you had to bore out the inside to turn it into a straw: if that were the case, you would drill 1 hole all the way through it.
Another analogy is a donut. Would you agree that a donut has just 1 hole? I would say yes. Now stretch that donut vertically untill you have a giant cylinder with a hole in the middle. That's basically now just a straw. The fact you stretched it doesn't increase the number of holes it has.
It's one, big long hole. If you drilled a hole through a board, do you say it's two holes?
Or it's 0 holes, as it's not cut out of something, but rather just formed that way meaning by strict dictionary definition, there are no "holes."
If you make the straw less long, it’s a donut. And a donut obviously has 1 hole. So a long donut only has one hole. Q.E.D
Does a doughnut have two holes?
Because a straw is just an elongated doughnut.
I’m more interested in humans. Is the mouth and anus two holes or one?
Poop. Beans. Here come the holes.
How many holes does a rubber band have? A donut?
Topologically a rubber band, a donut, and a straw have the same number of holes. The hole at either end of the straw is just a continuation of the same one hole.
How far are you zooming in? I'd say there are basically infinite holes if you look at it at an atomic scale
One
To settle this argument could you clarify if we're supposed to be considering the straw as a solid 3D object with a thickness, or as a curved 2D surface? The answer kind of depends on which you pick.
One long hole that goes all the way through the straw
Its one
A hole is an opening on (something), and a TUNNEL is an end that leads to a hole that leads to another hole and to another end. Therefore, it has zero holes, but one (very small) tunnel.
A tunnel is also just a hole. A long tunnel is clearly a tunnel (through a mountain, for instance).
How short does the tunnel need to be, to no longer be called a tunnel?
20 meters is a tunnel.
5 meters is a passage.
1 meter is an arch.
5 centimeters is more like a doorframe?
5 millimeters is definitely a hole.
0.1 millimeter is a hole (like in a paper in a binder).
Please don't post about US Politics. If you need to do this, try !politicaldiscussion@lemmy.world
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