Nuprl Lemma : and_preserved_by
4,23
postcript
pdf
T
:Type,
P
,
Q
:(
T
Prop),
R
:(
T
T
Prop).
R
preserves
P
R
preserves
Q
R
preserves
P
Q
latex
Definitions
P
Q
,
R
preserves
P
,
P
&
Q
,
x
f
y
,
Prop
,
x
:
A
.
B
(
x
)
,
P
Q
,
{
T
}
,
t
T
origin
T:Type, P, Q:(T
Prop), R:(TTProp). R preserves P 
R preserves Q R preserves P 
Q T:Type, P, Q:(TProp), R:(TTProp). R preserves P R preserves Q R preserves P Q Qx:A. B(x) Q
T