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Proof step 6 from proof fixpoint-nu (previous step)

compl(f)(μ(compl(f))) = μ(compl(f)), monotone(f) ⊦ f(ν(f))(x) ↔ ¬ μ(compl(f))(x)

User applied rule insert equation

And obtained the following new goals

Proof step 7:
monotone(f) ⊦ f(ν(f))(x) ↔ ¬ compl(f)(μ(compl(f)))(x)

Rule argument

pos: left 1 flags: rotate, discard

Additional information