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