Step |
Hyp |
Ref |
Expression |
1 |
|
1ex |
|
2 |
1
|
elintab |
|
3 |
|
simpl |
|
4 |
2 3
|
mpgbir |
|
5 |
|
oveq1 |
|
6 |
5
|
eleq1d |
|
7 |
6
|
rspccv |
|
8 |
7
|
adantl |
|
9 |
8
|
a2i |
|
10 |
9
|
alimi |
|
11 |
|
vex |
|
12 |
11
|
elintab |
|
13 |
|
ovex |
|
14 |
13
|
elintab |
|
15 |
10 12 14
|
3imtr4i |
|
16 |
15
|
rgen |
|
17 |
|
peano5nni |
|
18 |
4 16 17
|
mp2an |
|
19 |
|
1nn |
|
20 |
|
peano2nn |
|
21 |
20
|
rgen |
|
22 |
|
nnex |
|
23 |
|
eleq2 |
|
24 |
|
eleq2 |
|
25 |
24
|
raleqbi1dv |
|
26 |
23 25
|
anbi12d |
|
27 |
22 26
|
elab |
|
28 |
19 21 27
|
mpbir2an |
|
29 |
|
intss1 |
|
30 |
28 29
|
ax-mp |
|
31 |
18 30
|
eqssi |
|