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Proof step 4 from proof dnode-elim-strong (previous step)

dnode(md, sdt).dir? ⊦ ∃ md0, sdt0. dnode(md, sdt) = dnode(md0, sdt0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
⊦ dnode(md, sdt).dir?
Proof step 6:
⊦ ∃ md0, sdt0. dnode(md, sdt) = dnode(md0, sdt0)

Rule argument

Additional information

Used simplifier rules: isdnode: ⊦ dnode(md, sdt).dir?;