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Proof step 6 from proof getkeys-app (previous step)

∀ fis0. (fis1 + fis0) .keys = fis1 .keys + fis0 .keys ⊦ ((fv + fis1) + fis0) .keys = (fv + fis1) .keys + fis0 .keys

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
∀ fis0. (fis1 + fis0) .keys = fis1 .keys + fis0 .keys ⊦ ((fv ' + fis1) + fis0) .keys = (fv ' + fis1) .keys + fis0 .keys

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ fv + fis = fv ' + fis])]]