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Proof step 2 from proof subdel-01 (previous step)

a ∈ y0, x ⊆m y + (y0 -1l a) ⊦ x ⊆m (y + y0) -1l a

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
a ∈ y0, x ⊆m y + (y0 -1l a) ⊦ x ⊆m (y + y0) -1l a

Rule argument

Additional information