Can a transcendental argument reach the world, or only our beliefs?
The strongest case
The classic argument runs: for anyone to reason at all, certain things must already be true — so those things are true of the world, not merely believed by us.
What it still does not settle
We have not shown how the argument crosses from what a thinker must presuppose to what is actually the case outside the thinker. A critic can grant the presupposition and stop there.