Solipsism (; ) is the philosophical idea that only one's own mind is sure to exist. As an epistemological position, solipsism holds, that knowledge of anything outside one's own mind is unsure; the external world and other minds cannot be known, and might not exist outside the mind. As a metaphysical position, solipsism goes further to the conclusion that the world and other minds do not exist.
Varieties
There are varying degrees of solipsism that parallel the varying degrees of serious skepticism.
Metaphysical solipsism
Metaphysical solipsism is the "strongest" variety of solipsism....