theorem
proved
term proof
phi_lt_onePointEight
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formal statement (Lean)
102theorem phi_lt_onePointEight : φ < (1.8 : ℝ) :=
proof body
Term-mode proof.
103 lt_trans phi_lt_onePointSixOneNine (by norm_num)
104
105/-- φ > 1.6. -/