
What formal methods can (and can't) prove about a Gemma 4 + DFlash + DDTree blueprint?
May 01, 2026 · 19 min readAn audited-before-publish formal-methods write-up of a hypothetical G4-FlashTree speculative-decoding stack on Apple Silicon. Tier-classified evidence: 4 mechanically rechecked Lean theorems, 4 TLA+ properties under bounded TLC (with a load-bearing safe-vs-unsafe counter-example pair), 3 ABS behavioral models, and 9 deferred findings.











