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Theorem inapp-12

⊦ x + y = z + a ' ∧ b ∈ x ∧ y ≠ [] → b ∈ z

Type: A user defined theorem
Validity: The proof is valid.
Features: inefficientacforward, forward, localforward,
Comment:
Used by: inapp-11,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 2
Used lemmas: in-11, in-17, e-02, app-06, lastdiv, ni, in-append, a, in-15,
Used spec theorems:
- Used simplifier rules: