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Proof step 9 from proof at-1dim-other-index (previous step)

is_fskey(_length) ∨ r ≠ r, i < 0 ∨ j ≤ i ⊦ (addarray(r, initial_value(ty), j, st[r -- _type, typeval(mkarraytype(ty))])[r -- _length, intval(j)][r -- i ']) = st[r -- i ']

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
i < 0 ∨ j ≤ i ⊦ (addarray(r, initial_value(ty), j, st[r -- _type, typeval(mkarraytype(ty))])[r -- i ']) = st[r -- i ']

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_fskey(_length)], [CSIMPSEQ : ⊦ (st[r0 -- _length, val][r -- i '] ) = st[r -- i ']])]]