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Theorem abs-21

⊦ r ≠ r0 → (abs(r) = abs(r0) ↔ r = ~ r0)

Type: A user defined theorem
Validity: The proof is valid.
Features: s, ls,
Comment:
Used by:
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 7
Used lemmas: absneg-01, Abs-pos, Abs-neg,
Used spec theorems:
- Used simplifier rules: