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Proof step 7 from proof add-field-same (conclusion)

str ≠ str0 ⊦ (addobj(r, class, (mkfs(class0, ty0, ((* str)) .field) ' × val) ' + fis, st)[r -- mkfs(class1, ty1, ((* str0)) .field) ']) = (addobj(r, class, fis, st)[r -- mkfs(class1, ty1, str0 .field) '])

Special step normalize

And obtained the following new goals

Proof step 6:
str ≠ str0 ⊦ (addobj(r, class, (mkfs(class0, ty0, str .field) ' × val) ' + fis, st)[r -- mkfs(class1, ty1, str0 .field) ']) = (addobj(r, class, fis, st)[r -- mkfs(class1, ty1, str0 .field) '])