To clarify my comments about Repaire, an epistemological solipsist (as apposed to an ontological solipsist) believes that other people exist, just that we cannot experience the Qualia of another.
It's a bit like being in a tent and having to discover what "reality"(Danger Will Smith Danger !!!),is by feeling through the skin of the tent; we are all alone behind our personal solipsistic membrane.

PP