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Proof step 6 from proof all-classes-01 (previous step)

⊦ ∃ class. ∀ r, ty, fieldvar. ¬ r -- mkfs(class, ty, fieldvar) ' ∈ rks

User applied rule insert lemma

And obtained the following new goals

Proof step 1:
⊦ ∃ str. ∀ rk. rk ∈ rks ∧ is_fskey(rk .key) → # rk .key .fs .class .class < # str
Proof step 5:
∃ str. ∀ rk. rk ∈ rks ∧ is_fskey(rk .key) → # rk .key .fs .class .class < # str ⊦ ∃ class. ∀ r, ty, fieldvar. ¬ r -- mkfs(class, ty, fieldvar) ' ∈ rks

Rule argument

[LEMMAARG : all-classes-02, [rks] → [rks]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (rks)]]