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theorem proved term proof

double_entry_exists

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formal statement (Lean)

 193theorem double_entry_exists : DoubleEntry := {

proof body

Term-mode proof.

 194  credit_has_debit := fun c _ => ⟨-c, rfl⟩,
 195  debit_has_credit := fun d _ => ⟨-d, rfl⟩
 196}
 197
 198/-! ## Ledger Algebra Summary -/
 199
 200/-- The complete ledger algebra bundle. -/

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