the basic grand achievement of parmenides was that he took current philosophy (focused mainly on natural philosophy – accounting for what is) and twisted it. early ionian philosophy accounted for the world by poisting that it was made up of one substance, to which everything is/exists according to the varying stages of the substance (what resulted: that the earth was made of water, air, the limitless, fire/flux, and God).
so paramenides wrote this account of the Truth. he claimed that what it is consisted not in what is/was, but what could be thought. because, he argued, to think of what is not (or to think of nothing) is to think of something, that means everything that is is and what is not is. everything exists! watch out!
so this was a major problem, all the presocrtics fought to deal with this. leucippius and democratics produced the atomic theory, which is kinda important. empedocles and axagoras also came up with answers, but all of these were evasions to the dilemma.
plato discovered this, and solved the problem. it was in the Sophist that he does the damn thing. his solution works quiet well, actually, in the theory of forms. i suppose solipism works quiet well with rationalism, overall.
it just seems to me that this little problem of having to refute existence of existing beyond the human mind has been around for a hell of a lot longer than one would like to believe. i actually haven’t seen the debate gone much past these initial stages. but i’m willing to believe that maybe wittengenstien contributed something, i’m not sure.
anyone think that solipism is a new thing, they’re wrong. is it worthy of so much of our attention, i wonder?