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Theorem sources-not-transitive

d1 = cdom(co0), d0 = cdom(co), cdom(co0) ⇒ cdom(co), cdom(co) ⇒ d, ¬ cdom(co0) ⇒ d, cdom(co0) ≠ cdom(co), cdom(co0) ≠ d ⊦ ¬ (d1 ∈ sources(co ' + co0 ', d0) ∧ d0 ∈ sources(co ' + co0 ', d) → d1 ∈ sources(co ' + co0 ', d))

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: sources-in-two,
Used spec theorems:
- Used simplifier rules: