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Proof step 25 from proof initval (conclusion)

⊦ flatten(val ++ initval(istate)) = flatten(val) ++ initval(istate)

Heuristic structural induction applied rule structural induction

And obtained the following new goals

Proof step 8:
⊦ flatten(val ++ initval(done)) = flatten(val) ++ initval(done)
Proof step 16:
⊦ flatten(val ++ initval(error)) = flatten(val) ++ initval(error)
Proof step 24:
⊦ flatten(val ++ initval(undone)) = flatten(val) ++ initval(undone)

Rule argument

[term-arg: istate]

Additional information

[[CONCRETESIMPRULES : ([CSIMPGEN : initstate generated by done, error, undone;])]]