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theorem proved term proof

rs_dynamics_approximable

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formal statement (Lean)

 164theorem rs_dynamics_approximable : ∀ ε > 0, ∃ q : ℚ, |phi - (q : ℝ)| < ε := by

proof body

Term-mode proof.

 165  intro ε hε
 166  obtain ⟨q, hq1, hq2⟩ := exists_rat_btwn (show phi - ε < phi + ε by linarith)
 167  exact ⟨q, by rw [abs_lt]; exact ⟨by linarith, by linarith⟩⟩
 168
 169/-! ## Summary Certificate -/
 170

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