∀A,x,b,a:Top. (l-ind([a / b];x;h,t,r.A[h;t;r]) ~ A[a;b;l-ind(b;x;h,t,r.A[h;t;r])])
{ (UnivCD THENA Auto) }
1. A : Top@i
2. x : Top@i
3. b : Top@i
4. a : Top@i
⊢ l-ind([a / b];x;h,t,r.A[h;t;r]) ~ A[a;b;l-ind(b;x;h,t,r.A[h;t;r])]