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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. -/

depends on (2)

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