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theorem proved term proof

logL_expL

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formal statement (Lean)

 105theorem logL_expL (x : LogicReal) : logL (expL x) = x := by

proof body

Term-mode proof.

 106  rw [eq_iff_toReal_eq, toReal_logL, toReal_expL]
 107  exact Real.log_exp _
 108
 109/-- Transported hyperbolic cosine definition. -/

depends on (6)

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