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theorem proved term proof

mul_assoc'

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formal statement (Lean)

 176theorem mul_assoc' (x y z : LogicReal) : (x * y) * z = x * (y * z) := by

proof body

Term-mode proof.

 177  rw [eq_iff_toReal_eq]
 178  simp
 179  ring
 180

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depends on (4)

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