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Proof step 3 from proof dom-remove-refsize0-down (previous step)

⊦ ∀ n. n ∈ dom remove-refsize0(gstore ↓) ↔ n ∈ dom remove-refsize0(gstore)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
⊦ n ∈ remove-refsize0(gstore ↓) ↔ n ∈ remove-refsize0(gstore)

Rule argument

Additional information

Used simplifier rules: ⊦ n ∈ dom gstore ↔ n ∈ gstore; (s)