Surely it a river doesn’t go all the way around the earth. Rivers typically have one (or many) start points, where they are surrounded on three sides by land, meaning it’s possible to cross from one side to the other. Otherwise it’s just a strait or channel.
However, that assumes you are not on the land in between a fork in the river. In which case you would have to cross a bridge outside of Königsberg, and we might have to expand the problem to crossing every bridge on the continent once.
SaharaMaleikuhm@feddit.org 2 days ago
But the river running round the whole planet does not matter in this case.
maxwellfire@lemmy.world 2 days ago
You run into it on the planet backside and then need another bridge, right?
KingGimpicus@sh.itjust.works 2 days ago
What about an opposite bridge where you cross under the river? Some sort of tubular subterranean structure. We could call them opposite bridges.
maxwellfire@lemmy.world 2 days ago
That would make the earth a donut lol and would work!
dwemthy@lemmy.world 2 days ago
Won’t be in Königsberg anymore though, so that bridge won’t count