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Theorem zero-ls-case

⊦ r * r0 < 0.r ↔ 0.r < r ∧ r0 < 0.r ∨ r < 0.r ∧ 0.r < r0

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 5
Used lemmas: zero-ge, zero-ls-03, mult-com, mult-ass, zero-ls-02,
Used spec theorems:
- Used simplifier rules: