Step |
Hyp |
Ref |
Expression |
1 |
|
eleq2 |
|
2 |
|
eleq2 |
|
3 |
2
|
raleqbi1dv |
|
4 |
1 3
|
anbi12d |
|
5 |
|
dfnn2 |
|
6 |
5
|
eqeq2i |
|
7 |
|
eleq2 |
|
8 |
|
eleq2 |
|
9 |
8
|
raleqbi1dv |
|
10 |
7 9
|
anbi12d |
|
11 |
6 10
|
sylbir |
|
12 |
|
nnssre |
|
13 |
5 12
|
eqsstrri |
|
14 |
|
1nn |
|
15 |
|
peano2nn |
|
16 |
15
|
rgen |
|
17 |
14 16
|
pm3.2i |
|
18 |
13 17
|
pm3.2i |
|
19 |
4 11 18
|
intabs |
|
20 |
|
3anass |
|
21 |
20
|
abbii |
|
22 |
21
|
inteqi |
|
23 |
|
dfnn2 |
|
24 |
19 22 23
|
3eqtr4ri |
|