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Proof step 11 from proof noval (conclusion)

⊦ flatten(val ++ noval) = flatten(val) ++ noval

Heuristic weak cut applied rule cut formula

And obtained the following new goals

Proof step 9:
is_valuelist(val ++ noval) ⊦ flatten(val ++ noval) = flatten(val) ++ noval
Proof step 10:
⊦ ¬ is_valuelist(val) → flatten(val) = val

Rule argument

[fma-arg: is_valuelist(val ++ noval)]

Additional information

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