This kind of stuff isn’t Epistemology, which is a huge field, it’s a an implication of Extreme Skepticism, which is useless and a complete whack-off.
Real, useful thought requires granting a prioi status to the fact SOMETHING is true. Even a first statement, P=P must be considered axiomatic. Extreme skepticism says, “But we can’t prove P=P”. Even cogito ergo sum is circulus in probando, so not much of a metaphysics itself.
Extreme skepticism itself creates it’s own frame and assumes it’s own axioms. For example, that a thing either must exist or not exist - the frame is of an assumed western metaphysical cleavage of “is/not is” - it’s a frame of absolute. In other words, the question it asks is not whether a thing IS, but whether a thing ABSOLUTELY IS. There are other questions to be asked, other metaphysical frames rather than the frame of Western absolute, I.E. either a thing is or it is not.
But reality isn’t absolute, which is the assumption of Extreme Skepticism. For example, material, REAL material, doesn’t exist absolutely. Sub-atomic particles, which are the ‘stuff’ of the material universe, don’t exist as absolutes, they exist as probabilities. An absolute, meaning something either is or is not, is simply one metaphysical frame that is used in classical Western philosophy, and this metaphysical frame is VERY useful as an intellectual TOOL. But it does have limited applications, and attempting to apply an absolutist frame to examine non-absolutes and then drawing some conclusion from it isn’t valid.
That this frame has it’s limits - and that’s the real point of Extreme Skepticism. Extreme Skeptics are like performance artists. They don’t REALLY think that nothing can be known, they’re pointing to the limits of that metaphysical frame. But sometimes people that smoke a lot of weed are often exposed to this Stoner Urban Myth, not understanding what it really is or what it really means, and assume it to mean “What do we really know anyway?”
BTW - I’m not trying to bust anyone’s balls here, but I want to point out something off-topic:
This is argumentum ad ignorantiam. You’re not going to go anywhere with Western Thought Systems if you don’t yet recognize the basic rules of logic. Wanting to discuss extreme epistemology without knowing basic logic is like a first grader wanting to discuss calculus when he hasn’t learned basic arithmetic yet - he’s not gonna get until he learns a bunch of other stuff first, and most of his questions about it will be answered along the way.
But I can sorta-kinda respond one question at least:
No, but you would have to know that ‘assumption’ isn’t ‘axiom’ and how we determine what is axiomatic. Is P=P true or false? Is that an assumption?