Nuprl Lemma : existse-ge_wf
0,22
postcript
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es
:ES,
e
:E,
P
:(E
Prop).
e
e'
.
P
(
e'
)
Prop
latex
Definitions
ES
,
t
T
,
x
:
A
.
B
(
x
)
,
E
,
Prop
,
x
(
s
)
,
e
e'
,
P
&
Q
,
x
:
A
.
B
(
x
)
,
e
e'
.
P
(
e'
)
Lemmas
es-le
wf
,
es-E
wf
,
event
system
wf
origin
es:ES, e:E, P:(E
Prop). 
e
e'.P(e') 
Prop es:ES, e:E, P:(EProp). ee'.P(e') Prop Tx:A. B(x) e' x:A. B(x)ee'.P(e')