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Proof step 7 from proof boolval (previous step)

⊦ is_valuelist(val), flatten(val ++ boolval(true)) = flatten(val) ++ boolval(true)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ ¬ is_valuelist(val) → flatten(val) = val
Proof step 6:
⊦ flatten(val ++ boolval(true)) = val ++ boolval(true), is_valuelist(val)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]