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Proof step 37 from proof exlist (previous step)

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

User applied rule all left

And obtained the following new goals

Proof step 36:
∀ val. ∃ val3, val2. flatten(val ++ val1) = val3 ++ val2, ∃ val0, val3. flatten(val ++ val1 ++ val2) = val0 ++ val3, ∀ val. ∃ val1, val3. flatten(val ++ val2) = val1 ++ val3 ⊦ ∃ val0, val3. flatten(val ++ val1 ++ val2) = val0 ++ val3

Rule argument

[EXRARG : pos: left 2, [extquanttermlist: (val ++ val1) abort:F , discard:F , computed:F ]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (val ++ val1)]]