LF to Hyb - things breaking all over
L_to_Hyb: simpler rule for lambda rewrite
L_To_Hyb: world opening preserved by the relation
Admitted lemma on shifted terms typing
L_to_Hyb: Simpler box
L_to_Hyb: Even simpler box
L_to_Hyb: simpler letdia
L_to_Hyb: function instead of relation