| Step |
Hyp |
Ref |
Expression |
| 1 |
|
dfdif2 |
|
| 2 |
|
dfnul3 |
|
| 3 |
2
|
uneq2i |
|
| 4 |
|
un0 |
|
| 5 |
|
unrab |
|
| 6 |
3 4 5
|
3eqtr3i |
|
| 7 |
|
ianor |
|
| 8 |
|
eluni |
|
| 9 |
8
|
anbi1i |
|
| 10 |
|
df-rex |
|
| 11 |
|
elin |
|
| 12 |
11
|
anbi2i |
|
| 13 |
|
df-an |
|
| 14 |
12 13
|
bitr3i |
|
| 15 |
14
|
anbi2i |
|
| 16 |
|
eldifsn |
|
| 17 |
|
necom |
|
| 18 |
17
|
anbi2i |
|
| 19 |
16 18
|
bitri |
|
| 20 |
19
|
anbi2i |
|
| 21 |
|
ancom |
|
| 22 |
21
|
anbi2ci |
|
| 23 |
|
anass |
|
| 24 |
20 22 23
|
3bitri |
|
| 25 |
|
an32 |
|
| 26 |
24 25
|
bitr3i |
|
| 27 |
15 26
|
bitr3i |
|
| 28 |
27
|
exbii |
|
| 29 |
|
19.41v |
|
| 30 |
10 28 29
|
3bitri |
|
| 31 |
|
rexnal |
|
| 32 |
9 30 31
|
3bitr2ri |
|
| 33 |
32
|
con1bii |
|
| 34 |
7 33
|
bitr3i |
|
| 35 |
34
|
rabbii |
|
| 36 |
1 6 35
|
3eqtri |
|
| 37 |
36
|
neeq1i |
|
| 38 |
|
rabn0 |
|
| 39 |
37 38
|
bitri |
|