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Proof step 2 from proof mapornull-ex (previous step)

⊦ r =>? = r =>_, r = null

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: mapornull: ⊦ r =>? = (r = null ⊃ emp;r =>_);%mapex: ⊦ r =>_ = _∃(λ o. r => o);