It is generally believed that solipsism is an entirely hypothetical reality whose possibility is impossible to refute. Well, here's an epistemological refutation to test that belief:

1a. The human mind develops.

2a. The state of the human mind can only change with perception to affect its state, or the acceptance of the existence of a body by which it might mature.
2b. The body exists.

3a. Perception requires a body to mediate the alteration of the mind.
3b. The body exists.

4a. The human mind alters itself.
4b. The human mind is divided in will, as the reformative state alters the conservative state.
4c. The reformative state and the conservative state are differentiated entities.
4d. There are two human minds, which must exist in two seperate spaces, therefore as seperate conginent existents.
4e. The body exists.

5a. A body is defined by the space or contingency it assumes.
5b. The body exists.

There is no way in which the human mind can change without the existence of a body, and therefore a spatial world.

Anyone with comments, corrections or critiques, please message me -- I think this argument is pretty solid, but there may be a hole here or there to fill!