T:Type, a:T, as:T List, i:. 0<i  i||as||  (a.as)\[i] = (a.as\[i-1]) 

latex

Definitions	as\[i], False, A, True, i<j, b, b, , ij, T, P  Q, P & Q, P  Q, Unit, t  T, Prop, x:A. B(x), ||as||, AB, P  Q
Lemmas	le wf, length wf1, eqtt to assert, assert of le int, iff transitivity, eqff to assert, squash wf, true wf, bnot of le int, assert of lt int, le int wf, bool wf, bnot wf, assert wf, lt int wf, reject wf