0 the belief that only your own experiences and existence can be known --
In particular, it falls into the trap of solipsism.
As a metaphysical position, solipsism goes further to the conclusion that the world and other minds do not exist.
Solipsism is an extension of this which assumes that only one's own mind is sure to exist.
Realism in a minimal sense, that "there is an external universe" is most likely not observationally distinct from solipsism.
It is only incidentally related to philosophical solipsism.
Epistemological solipsism is the idea that the existence of the world outside the mind is an unresolvable question.
This was a world that prized individuality and privacy within sociability, and hence feared that this new modern selfhood could easily degenerate into secrecy, anomie, solipsism, and fantasy.
In contrast to solipsism (also called absolute idealism), transcendental idealism acknowledges that there is a real world out there.