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Theorem lasttwo

a ∈ x, a0 ∈ x ⊦ ∃ a1, y, z. x = y + a1 ' + z ∧ (a1 = a ∨ a1 = a0) ∧ ¬ a ∈ z ∧ ¬ a0 ∈ z

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: 8
Used lemmas: a, in-append, in-13, lastoc,
Used spec theorems:
- Used simplifier rules: