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Proof step 38 from proof exlist (previous step)

is_valuelist(val ++ val1 ++ val2), ∀ val. ∃ val3, val2. flatten(val ++ val1) = val3 ++ val2, ∀ val. ∃ val1, val3. flatten(val ++ val2) = val1 ++ val3 ⊦ ∃ val0, val3. flatten(val ++ val1 ++ val2) = val0 ++ val3

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 37:
∀ val. ∃ val3, val2. flatten(val ++ val1) = val3 ++ val2, ∀ val. ∃ val1, val3. flatten(val ++ val2) = val1 ++ val3 ⊦ ∃ val0, val3. flatten(val ++ val1 ++ val2) = val0 ++ val3

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ is_valuelist(val ++ val0)])]]