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1.
Alph:
Type
2.
L:
Alph*
Prop
3.
l:
Alph*
4.
i:
{0...||l||}
5.
L(l[0..i
])
6.
(l[i..||l||
]) = nil
7.
||l[i..||l||
]|| = ||nil||
L(l)
By:
RWH (LemmaC
Thm*
as:T*, i:{0...||as||}, j:{i...||as||}. ||as[i..j
]|| = j-i) 7
Generated subgoal:
1
7.
||l||-i = ||nil||
L(l)
About:
L(l)
Prop
])]) = nil]|| = ||nil|| 
L(l)
as:T*, i:{0...||as||}, j:{i...||as||}. ||as[i..j]|| = j-i)
7 L(l)
