Nuprl Lemma : rel_star_symmetric
4,23
postcript
pdf
T
:Type,
R
:(
T
T
Prop). (Sym
x
,
y
:
T
.
x
R
y
)
(Sym
x
,
y
:
T
.
x
(
R
^*)
y
)
latex
Definitions
Sym
x
,
y
:
T
.
E
(
x
;
y
)
,
R
^*
,
x
:
A
.
B
(
x
)
,
P
Q
,
x
f
y
,
Prop
,
t
T
,
R
^-1
,
R1
=>
R2
,
P
Q
,
P
&
Q
,
P
Q
Lemmas
rel
inverse
star
,
rel
inverse
wf
,
rel
star
monotonic
,
rel
star
wf
origin