Personal Identity as a Persistence Problem - A Structural Analysis of Human Systems under Continuous Transformation

Human identity is typically treated as continuous by default. Biological, psychological, and philosophical accounts describe change across the lifespan but do not specify the structural condition under which a human system remains the same individual under real transformation. This paper reformulates personal identity as a persistence problem within the framework of La Profilée. It shows that identity is not guaranteed by biological continuity, memory, or narrative coherence — but exists only as long as transformation remains structurally integrable. A precise distinction follows: biological survival and structural identity are not equivalent. A human organism can persist while personal identity collapses. Identity is not lost gradually. It ceases when the persistence condition is structurally violated. This result does not compete with existing accounts of personal identity. It specifies the structural domain within which those accounts operate.