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lemma proved term proof

complex_norm_ofReal

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formal statement (Lean)

 101lemma complex_norm_ofReal (x : ℝ) : ‖(x : ℂ)‖ = |x| := by

proof body

Term-mode proof.

 102  have : (x : ℂ) = (RCLike.ofReal x : ℂ) := rfl
 103  rw [this, RCLike.norm_ofReal]
 104
 105/-- Error bound for log Taylor polynomial on reals, using Complex.norm_log_sub_logTaylor_le -/

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