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Proof step 6 from proof refval (previous step)

⊦ flatten(val ++ refval(r)) = val ++ refval(r), is_valuelist(val)

Heuristic weak cut applied rule cut formula

And obtained the following new goals

Proof step 4:
⊦ ¬ is_valuelist(val0) → flatten(val ++ val0) = flatten(val) ++ val0
Proof step 5:
⊦ ¬ is_valuelist(val) → flatten(val) = val

Rule argument

[fma-arg: is_valuelist(refval(r))]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ is_valuelist(refval(r))], [CSIMPSEQ : ⊦ val ++ val1 = val0 ++ val1 ↔ val = val0])], [EXTRAFMAS : (is_valuelist(refval(r)))]]