Level: Lib Thy Top:
Hypotheses:None
Conclusion:
Alph:
. L:L(Alph). (L
) = L
Applied Tactic: Unfold `lang_eq` 0 THEN
Unfold `lang_prod` 0 THEN
Unfold `languages` 0 THEN
Unfold `lang_sing` 0 THEN
UnivCD THENW Auto
Generated subgoals:1. (
l.
i:{0...||l||}. L l[0..i
] 
(l.
null(l)) l[i..||l||]) l 
L l