The LTF Sequence defines the structural basis for cross‑layer transformation in layered systems. It identifies the operators, mechanisms, and relationships required for a structure to move upward into higher‑freedom layers and downward into more constrained layers while preserving identity, coherence, and compatibility with each layer’s constraint envelope.
LTF consists of the upward operator (abstraction), the downward operator (compression), the mechanisms that perform them, and the duality that binds them into a coherent architecture.