Step of Proof: complete_nat_ind_with_y
9,38
postcript
pdf
Inference at
*
1
1
2
I
of proof for Lemma
complete
nat
ind
with
y
:
1.
P
:
{k}
2.
g
:
i
:
. (
j
:
i
.
P
(
j
))
P
(
i
)
3. Y(
f
,
x
.
g
(
x
,
f
))
!Void()
!Void()
Y(
f
,
x
.
g
(
x
,
f
))
(
i
:
.
P
(
i
))
latex
by Assert
n
:
. Y(
f
,
x
.
g
(
x
,
f
))
(
m
:
n
.
P
(
m
))
latex
1
: .....assertion..... NILNIL
1:
n
:
. Y(
f
,
x
.
g
(
x
,
f
))
(
m
:
n
.
P
(
m
))
2
:
2:
4.
n
:
. Y(
f
,
x
.
g
(
x
,
f
))
(
m
:
n
.
P
(
m
))
2:
Y(
f
,
x
.
g
(
x
,
f
))
(
i
:
.
P
(
i
))
.
Definitions
,
t
T
,
x
:
A
.
B
(
x
)
,
{
i
..
j
}
,
#$n
,
x
(
s
)
,
Y
,
x
.
A
(
x
)
,
f
(
a
)
origin