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Proof step 8 from proof postfix-rec-right (previous step)

z + x = a ' + y, a ∈ z ⊦ z = [], ∃ z. z + x = y

User applied rule exists right

And obtained the following new goals

Proof step 9:
z + x = a ' + y, a ∈ z ⊦ z = [], z.rest + x = y

Rule argument

pos: right 2 terms: z.rest abort: F discard: T computed: F

Additional information

Used terms: z.rest