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Proof step 107 from proof onlymod-is-update (conclusion)

⊦ onlyModified(r, st0, st1) ↔ (∃ fis. st1 = update(r, fis, st0) ∧ validFields(r, fis, st0))

User applied rule case distinction

And obtained the following new goals

Proof step 96:
onlyModified(r, st0, st1) ⊦ ∃ fis. st1 = update(r, fis, st0) ∧ validFields(r, fis, st0)
Proof step 106:
∃ fis. st1 = update(r, fis, st0) ∧ validFields(r, fis, st0) ⊦ onlyModified(r, st0, st1)

Rule argument

[CASEDARG : pos: right 1, ()]

Additional information

[[CONCRETESIMPRULES : ()]]