More correctly:

Instead of what I wrote:

"What might be an accurate claim is: "within the technology and knowledge at such-and-such a time; and within the margin of error of the various definitions at this time; that atoms are ultimate"".

I suggest: not that "atoms" are ultimate; but that such-and-such "defining relationships" are ultimate? Tautological relations?

Since we agreed elsewhere that "relationships exist"; the question is: what about ultimate relationships? A completely honest relationship (no contradictions) would be ultimate?

Existence as a defining relationship? That looks like Christianity (God is Existence is Love).

Maybe getting somewhere.

-Alan