Comment on Jeopardy wall calendar pretending that the coastline paradox doesn't exist
nublug@piefed.blahaj.zone 6 days ago
i hate the coastline ‘paradox’ and every other ‘paradox’ that’s just a missing variable. “if we measure with a big resolution it’s a smaller number of units and a small resolution is a bigger number!?” that’s not a paradox. that’s just how that variable works always. it’s not confusing or interesting at all.
scott@lem.free.as 6 days ago
But if you shrink the “yardstick” down to an infinitesimally small size, the length, effectively, becomes infinite… and it’s the same for all coastlines. They’re all infinitely long.
… but some are longer than others. ;)
Fredthefishlord@lemmy.blahaj.zone 6 days ago
Literally no
kartoffelsaft@programming.dev 6 days ago
Limits can resolve to infinity. The coastline paradox is just the observation that the (semi-reasonable) assumption that landmasses are fractal shaped implies the coastline tends towards infinity with smaller yardsticks.
Fredthefishlord@lemmy.blahaj.zone 6 days ago
They can… I wasn’t saying they couldn’t… I meant that as to point to the logic you’d use to prove it finite
spicehoarder@lemmy.zip 5 days ago
If you’re going to talk about paradoxes, you should also know you’re committing a presupposition fallacy
MrPoopyButthole@lemmy.world 6 days ago
Max Planck says no…
Lemming6969@lemmy.world 6 days ago
Didn’t calculus solve this stuff?
spicehoarder@lemmy.zip 6 days ago
Surely the distance approaches some finite value.
calcopiritus@lemmy.world 6 days ago
You can’t shrink the yardstick down to an infinitesimal size.
Coastlines are not well defined. They change in time with tides and waves. And even if you take a picture and try to measure that, you still have to decide at what point exactly the sea ends and the land starts.
If the criteria for that is “the line is where it would make a fractal” then sure, by that arbitrary decision, it is infinite. However, a way better way to answer the question “where is the line” is to just decide on a fixed resolution (or variable if you want to get fancy), which makes the distinction between sea and land clearer.
It is like saying that an electron is everywhere in the universe, because of Heisenberg’s uncertainty principle. While it is very technically true, just pick a resolution of 1mm^3 and you know exactly where the electron is.