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lemma proved term proof

toZ_fromZ

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formal statement (Lean)

  16@[simp] lemma toZ_fromZ (δ : ℤ) (hδ : δ ≠ 0) (n : ℤ) :
  17  toZ δ (fromZ δ n) = n := rfl

proof body

Term-mode proof.

  18
  19end LedgerUnits
  20
  21open LedgerUnits
  22
  23/-- Affine map from ℤ to ℝ: n ↦ slope·n + offset. -/

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depends on (7)

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