intro c c_child
C : List TNode
L R : Finset Formula
lrApp : LocalRuleApp (L, R) C
⊢ ∀ c ∈ C, lengthOfTNode c < lengthOfTNode (L, R)
C : List TNode
L R : Finset Formula
lrApp : LocalRuleApp (L, R) C
c : TNode
c_child : c ∈ C
⊢ lengthOfTNode c < lengthOfTNode (L, R)