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theorem proved term proof

derivation_chain_consistent

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formal statement (Lean)

 184theorem derivation_chain_consistent : Nonempty DerivationChain := by

proof body

Term-mode proof.

 185  constructor
 186  exact {
 187    has_recognition := ⟨Unit, ⟨fun _ _ => True, (), trivial⟩⟩,
 188    forces_ledger := trivial,
 189    forces_phi := trivial
 190  }
 191
 192/-- φ is the unique positive solution to x² = x + 1. -/

depends on (5)

Lean names referenced from this declaration's body.