Hi there, I'm 17 years old and currently reading the Critique of Pure Reason in the German language (which happens to be my first language so that's no problem).
While reading, one question has arised: How does Kant actually prove the existence of the thing in itself? He argues that the thing in itself stimulates the senses and thereby effects perception. This is an appliance of causality, which is -according to Kant himself- appropiate only in the realm of phenomena.
Is this a mistake of Kant? Does he disprove idealism in another part of that book? Is it enough that the existence of the thing in itself is possible to think? Does this have something to do with existence being no predicate?
I'm looking forward to an answer.