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Theorem from-from

⊦ ¬ # σ < ⌜m + n⌝ → σ.drop(m).drop(n) = σ.drop(m + n)

Type: A user defined theorem
Validity: The proof is valid.
Features: s,
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: 6
Used lemmas: get-from-inf, from-nf, size-inf, from-inf, from-fin,
Used spec theorems:
- Used simplifier rules: