Step |
Hyp |
Ref |
Expression |
1 |
|
dfuzi.1 |
|
2 |
|
ssintab |
|
3 |
1
|
peano5uzi |
|
4 |
2 3
|
mpgbir |
|
5 |
1
|
zrei |
|
6 |
5
|
leidi |
|
7 |
|
breq2 |
|
8 |
7
|
elrab |
|
9 |
1 6 8
|
mpbir2an |
|
10 |
|
peano2uz2 |
|
11 |
1 10
|
mpan |
|
12 |
11
|
rgen |
|
13 |
|
zex |
|
14 |
13
|
rabex |
|
15 |
|
eleq2 |
|
16 |
|
eleq2 |
|
17 |
16
|
raleqbi1dv |
|
18 |
15 17
|
anbi12d |
|
19 |
14 18
|
elab |
|
20 |
9 12 19
|
mpbir2an |
|
21 |
|
intss1 |
|
22 |
20 21
|
ax-mp |
|
23 |
4 22
|
eqssi |
|