def
definition
def or abbrev
has_phi_structure
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formal statement (Lean)
77def has_phi_structure {N : ℕ} (c : InitialCondition.Configuration N) : Prop :=
proof body
Definition body.
78 ∃ i j : Fin N, ∃ n : ℤ, n ≠ 0 ∧ c.entries i / c.entries j = PhiForcing.φ ^ n
79