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theorem proved term proof

J_log_pos

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formal statement (Lean)

  84theorem J_log_pos {t : ℝ} (ht : t ≠ 0) : J_log t > 0 := by

proof body

Term-mode proof.

  85  have hne : J_log t ≠ 0 := fun h => ht (J_log_eq_zero_iff.mp h)
  86  have hge : J_log t ≥ 0 := J_log_nonneg t
  87  exact lt_of_le_of_ne hge (Ne.symm hne)
  88
  89/-- J_log is symmetric: J_log(-t) = J_log(t). -/

used by (4)

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depends on (8)

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