I've been transported through a wormhole to a new planet in a new universe.
Standard stuff, really.
But something is... off about this planet. Sometimes, walking around it, I just feel like I'm going in the wrong direction entirely. And it gets weirder. When I first arrived, I decided to make the best of the situation and stick a flag in the ground, claiming the land as my own. That flag became my home base, but one day during my exploring I got particularly lost and found the bottom of the flagpole sticking out of the ground. I don't remember how I got back that night, but I eventually stumbled back to the original flag - absolutely untouched.
Thanks to some recent developments, I've been able to contact a team of mathematicians on the other side of the wormhole to help resolve my problems. It seems the communication is one-way, though, because they are now stuck in the wormhole trying to get to my side. The only thing that got through seems like a piece of one of their notes:
v v Z,Z(F2),0,...
What is this planet, and what is this universe? Where the hell am I?