Nuprl Lemma : length_append
11,40
postcript
pdf
T
:Type,
as
,
bs
:(
T
List). ||append(
as
;
bs
)|| = (||
as
|| + ||
bs
||)
latex
Definitions
t
T
,
x
:
A
.
B
(
x
)
,
Y
,
append(
as
;
bs
)
,
||
as
||
Lemmas
length
wf1
origin
T:Type, as,bs:(T List). ||append(as; bs)|| = (||as|| + ||bs||) T:Type, as,bs:(T List). ||append(as; bs)|| = (||as|| + ||bs||) 
Tx:A. B(x)