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Proof step 4 from proof add-in-06 (previous step)

sk ∈ fv ' + fis0, ∀ sk, r, class1, st. sk ∈ fis0 → r -- sk ∈ addobj(r, class1, fis0, st) ⊦ r -- sk ∈ addobj(r, class1, fv ' + fis0, st)

User applied rule structural induction

And obtained the following new goals

Proof step 3:
⊦ sk0 ∈ (sk × val) ' + fis0 ∧ (∀ sk, r, class1, st. sk ∈ fis0 → r -- sk ∈ addobj(r, class1, fis0, st)) → r -- sk0 ∈ addobj(r, class1, (sk × val) ' + fis0, st)

Rule argument

[VARWITHFMAVARSARG : fv, ()]

Additional information

[[CONCRETESIMPRULES : ([CSIMPGEN : fieldvalue generated by ×;])]]