I disagree with Descartes "Cogito ergum sum"!
The problem on the axiom he proposes starts with the "I" itself.
He rather should have focus in a more abstract manner in the Experiencing itself which cannot be dismissed out of existence even if the kind of experiencing we have in our domain is just a "dream" or "matrix" of some kind.
Dreams are real dreams
...while that which is doing the dreaming we don't know what is or if it is at all.
Maybe pure experiencing is all there is, and nothing of the sort we imagine it means. Experiencing does not entail a subject, free will, volition, and other supposed fundamentals...
Experiencing is just a 4D movie!
A better axiom is an axiom which cannot be contradicted and Experiencing cannot be contradicted as experiencing is required to attempt to dismiss Experiencing itself, which is paradoxical.