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Proof step 3 from proof delete-class (previous step)

str ≠ str0 ⊦ (claset ++ str .class) -- str0 .class = (claset -- str0 .class) ++ str .class

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ str = str0, (claset ++ str .class) -- str0 .class = (claset -- str0 .class) ++ str .class

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]