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Theorem lasttwo

a ∈ x, a0 ∈ x ⊦ ∃ b, y, z. x = y + b ' + z ∧ (b = a ∨ b = 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: 7
Used lemmas: in-rec, in-append, in-13, a, lastoc,
Used spec theorems:
- Used simplifier rules: