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theorem proved term proof

posInv_half

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formal statement (Lean)

 759@[simp] theorem posInv_half : posInv posHalf = posTwo := by

proof body

Term-mode proof.

 760  apply Subtype.ext
 761  norm_num [posInv, posTwo, posHalf]
 762
 763/-- The honest automorphism type of the canonical cost algebra on `ℝ_{>0}`. -/

depends on (13)

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