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Theorem abs-eqneg

⊦ j < 0 ∧ i < 0 → abs(i) * abs(j) = i * j

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: square-eq,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 1
Used lemmas: eq-neg, commutativity, associativity, minus-left,
Used spec theorems:
- Used simplifier rules:
  - int-abs/neg-02
  - int-abs/abs-08