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Theorem zero-ge-case

⊦ 0.r ≤ r * r0 ↔ r = 0.r ∨ r0 = 0.r ∨ 0.r ≤ r ∧ 0.r ≤ r0 ∨ r ≤ 0.r ∧ r0 ≤ 0.r

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

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Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 6
Used lemmas: zero-ls, zero-ls-01, mult-zero, mult-com, mult-ass, zero-ge-01,
Used spec theorems:
- Used simplifier rules: