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Theorem in-prefixn-pos-smaller0

⊦ a ∈ prefixn(n, x) ∧ m ≤ pos(a, x) → m ≤ n

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 2
Proof steps: 7
Used lemmas: prefixn,
Used spec theorems:
- Used simplifier rules: