Proofgold Proof

The subproof is completed by applying and7E with Field x0, Field x1, field0 x0 ⊆ field0 x1, field3 x0 = field3 x1, field4 x0 = field4 x1, ∀ x2 . x2 ∈ field0 x0 ⟶ ∀ x3 . x3 ∈ field0 x0 ⟶ field1b x0 x2 x3 = field1b x1 x2 x3, ∀ x2 . x2 ∈ field0 x0 ⟶ ∀ x3 . x3 ∈ field0 x0 ⟶ field2b x0 x2 x3 = field2b x1 x2 x3.