This question already has an answer here:
When I was in my teens, I think (if so it must have been in the seventies or early eighties), I read a short story about a single person landing in a space ship on a hostile military planet, and then driving everyone mad there with paradoxes. In this way he managed to beat them, or get out safely or something like that. Maybe even engender a revolution.
The reason I would like to find this story again, is that it ends with a description of him back in his ship and on his way, trying to think of a cardinality between those of the natural numbers and the real numbers. This clearly was about the continuum hypothesis, although I don't think it was named like that in the story. And then the story ends with something like "... and then he did not look stable at all."
This might have been a Robert Sheckley story, but I searched for a long time and haven't found it, so this may not be the case.