Step |
Hyp |
Ref |
Expression |
1 |
|
19.28v |
|
2 |
|
r19.42v |
|
3 |
|
19.26 |
|
4 |
|
19.26 |
|
5 |
|
jcab |
|
6 |
5
|
albii |
|
7 |
|
pwss |
|
8 |
|
pwss |
|
9 |
7 8
|
anbi12i |
|
10 |
4 6 9
|
3bitr4i |
|
11 |
|
ralcom4 |
|
12 |
|
19.23v |
|
13 |
|
3anass |
|
14 |
13
|
exbii |
|
15 |
|
df-rex |
|
16 |
14 15
|
bitr4i |
|
17 |
16
|
imbi1i |
|
18 |
12 17
|
bitri |
|
19 |
18
|
ralbii |
|
20 |
11 19
|
bitr3i |
|
21 |
10 20
|
anbi12i |
|
22 |
|
anass |
|
23 |
21 22
|
bitri |
|
24 |
3 23
|
bitri |
|
25 |
|
dfss2 |
|
26 |
|
df-an |
|
27 |
25 26
|
imbi12i |
|
28 |
|
3impexp |
|
29 |
|
biid |
|
30 |
|
expanduniss |
|
31 |
29 30
|
expandan |
|
32 |
31
|
expandrexn |
|
33 |
32
|
imbi2i |
|
34 |
33
|
imbi2i |
|
35 |
34
|
imbi2i |
|
36 |
28 35
|
bitri |
|
37 |
36
|
expandral |
|
38 |
27 37
|
expandan |
|
39 |
38
|
albii |
|
40 |
24 39
|
bitr3i |
|
41 |
40
|
expandrex |
|
42 |
2 41
|
bitr3i |
|
43 |
42
|
albii |
|
44 |
1 43
|
bitr3i |
|
45 |
44
|
expandral |
|