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From Spine II: P22b transport

Lean spine source

Declarations: P22b_semantic_not_full_transport

From the machine-checked spine in formal/ (Mathlib + spine imports). Not self-contained for Lean 4 Web — use the repo or a local lake build.

theorem P22b_semantic_not_full_transport :
    ∃ t : FinTransportLayers,
      FinSemanticTransport t ∧ ¬ FinFullTransport t :=
  ⟨finTransportSemanticOnly, fin_semantic_only, fin_not_full_transport⟩