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Proof step 24 from proof base-return (previous step)

∀ val. flatten(return(val, ty0)) = return(val, ty0) ⊦ flatten(return(val, mkarraytype(ty0))) = return(val, mkarraytype(ty0))

Heuristic weak cut applied rule cut formula

And obtained the following new goals

Proof step 23:
⊦ ¬ is_valuelist(val) → flatten(val) = val

Rule argument

[fma-arg: is_valuelist(return(val, mkarraytype(ty0)))]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ is_valuelist(return(val, ty))])], [EXTRAFMAS : (is_valuelist(return(val, mkarraytype(ty0))))]]