Step |
Hyp |
Ref |
Expression |
1 |
|
nfrab1 |
|
2 |
|
nfrab1 |
|
3 |
1 2
|
nfdif |
|
4 |
|
nfrab1 |
|
5 |
|
eldif |
|
6 |
5
|
anbi1i |
|
7 |
|
andi |
|
8 |
|
pm3.24 |
|
9 |
8
|
biorfi |
|
10 |
|
ancom |
|
11 |
7 9 10
|
3bitr2i |
|
12 |
11
|
anbi2i |
|
13 |
|
anass |
|
14 |
|
anass |
|
15 |
12 13 14
|
3bitr4i |
|
16 |
6 15
|
bitr4i |
|
17 |
|
rabid |
|
18 |
|
eldif |
|
19 |
|
rabid |
|
20 |
|
ianor |
|
21 |
|
rabid |
|
22 |
20 21
|
xchnxbir |
|
23 |
19 22
|
anbi12i |
|
24 |
18 23
|
bitri |
|
25 |
16 17 24
|
3bitr4ri |
|
26 |
3 4 25
|
eqri |
|