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Theorem at-eq

⊦ m < # chars ∧ n < # chars ∧ ¬ dups(chars) → (chars[m] ' = chars[n] ' ↔ m = n)

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
Used by units in proved state: string2nat,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 1
Proof steps: 2
Used lemmas:
Used spec theorems:
- string-data/inj-03
Used simplifier rules:
- list-data/charlist/l
- nat-basic1/f
- string-append/one-01
- string-append/first-one
- list-del/charlist/get-nodups