> There are things that are merely probable, and there are things that are beyond doubt. The latter could be the empty set, and no argument I've seen has concl

> There are things that are merely probable, and there are things that are beyond doubt. The latter could be the empty set, and no argument I've seen has conclusively proven that it's inhabited. Solipsism is the ultimate refuge from the claim that there are things beyond doubt. All you can do is make the contingency of facts explicit, like, "given the assumption of an external world to our minds, atoms exist".