Proof Mind is Fundamental and Matter Doesn't Exist

[robvalue]

Others have raised many of the specific objections I would make, so I won't repeat all of them.

Solipsism could be impossible, but not demonstrably so. To announce it is possible because it can't be proved impossible is, as Jorg says, the classic argument from ignorance.

Going back to what I said, you may currently be dreaming and you think you've proved something to various figments of your imagination during the dream that "minds cannot exist in this dream". That is your best case scenario, and it doesn't preclude you waking up and realising this dream makes no sense to anything. You also have some figments well trained in dream logic opposing you, so I guess you should be proud of your ability to counter your own arguments

It also raises the problem of what "exist" actually means. This isn't trivial. Does anything in a dream world exist, or not?