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Proof step 9 from proof gft-not-01 (previous step)

oktype(val, ty, st), r -- mkfs(class, ty0, fieldvar0) ' ∈ st, oktype(st[r -- mkfs(class, ty0, fieldvar0) '], ty0, st), r ∈ st ⊦ mkfs(class0, ty, fieldvar) ' = _type, oktype(((r = r0 ∧ class = class0 ∧ ty0 = ty ∧ fieldvar0 = fieldvar) ⊃ val; st[r -- mkfs(class, ty0, fieldvar0) ']), ty0, st)

Heuristic if-then-else split applied rule case distinction

And obtained the following new goals

Proof step 8:
⊦ ¬ oktype(val, ty, st0) → ¬ oktype(val, ty, st1)

Rule argument

[CASEDARG : pos: right 2, ()]

Additional information

[[CONCRETESIMPRULES : ()]]