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Theorem prefixn

⊦ prefixn(n, x) = (n ≤ # x ⊃ firstn(n, x);x)

Type: An axiom
Validity: The proof is valid.
Features: ls,
Comment:
Used by: in-prefixn-at-smaller, in-prefixn-in-shorter-prefix, in-prefixn-pos-smaller, in-prefixn-pos-smaller0, in-prefixn-samepos, isprefix-add-prefixn-size, isprefix-app-prefixn-isprefix, isprefix-prefixn, prefix-prefixn-exact, prefix-prefixn-not-shorter, prefix-prefixn-same, prefixn-0, prefixn-append-left, prefixn-append-prefix, prefixn-append-slice, prefixn-butlast, prefixn-empty, prefixn-eq-append, prefixn-eq-empty, prefixn-eq-prefixn-app, prefixn-full, prefixn-full-eq, prefixn-fulln, prefixn-in, prefixn-le-eq, prefixn-le-size, prefixn-len-le-n, prefixn-len-n, prefixn-neq-empty-plusone, prefixn-nodups, prefixn-notin, prefixn-prefixn, prefixn-prepend-one, prefixn-shift-right, prefixn-single-1, prefixn-size-eq, prefixn-size-prefixn, prefixn-split-dropn, prefixn-split-sublist,
Used by units in proved state:
Proof exists?: No