the digital root of c is not robust

theorem the_digital_root_of_c_is_not_robust :
  dr 299792457 = 9 ∧ dr 299792458 = 1 ∧ dr 299792459 = 2

Accepted by the Lean 4 kernel. The proof rests on no axioms at all.

Proven means three things together: the kernel accepted the file, the proof contains no sorry, and #print axioms reports a dependency set within {propext, Quot.sound}. The dependency set above is the evidence, recorded per theorem rather than summarised.

source	lean/DigitSpace.lean:395
archive	doi:10.5281/zenodo.22178675 — the concept DOI, resolving to the newest release
corpus	every statement · the ledger
reproduce	git clone https://github.com/ceccec/zeropoint-node && npm run lean:check

Speaks of the same objects as

• astronomical unit has digital root three
• base frequency has digital root nine
• dr and drTS differ at zero
• dr idempotent
• dr invariant under nine
• dr is drTS above zero
• light year has digital root nine
• speed of light has digital root one

What this does not establish

A theorem is a statement the kernel accepted. It says nothing about whether the surrounding package is useful, whether the idea is novel, or whether anything physical follows. Novelty is a universal negative no finite search decides; a dated deposit establishes priority, which is the defensible claim.