Nuprl Lemma : iflift_sq_1
4,23
postcript
pdf
c
:
,
f
,
x
,
y
:Top.
f
(if
c
x
else
y
fi) ~ if
c
f
(
x
) else
f
(
y
) fi
latex
Definitions
,
Unit
,
t
T
,
x
:
A
.
B
(
x
)
,
Top
Lemmas
top
wf
,
bool
wf
origin
c:
, f, x, y:Top. f(if c
x else y fi) ~ if c f(x) else f(y) fi c:, f, x, y:Top. f(if c x else y fi) ~ if c f(x) else f(y) fi 
Tx:A. B(x)