>>10217565There are only three things that you can infer, objectively, with instantaneous proof. These three things are indubitable and cannot be reduced:
You are a thinking thing.
There exists a fundamental logic to thought.
A realm of existence supports your existence.
Everything else relies on external evidence, even your own senses and memories can be twisted. Everything else can therefore be questioned, and should be, from the ground up.
To reach an understanding of the existence of other minds, you must first reach an understanding of the nature of the observer of the universe.