Step |
Hyp |
Ref |
Expression |
1 |
|
etasslt |
|
2 |
|
simpl1 |
|
3 |
|
scutbday |
|
4 |
2 3
|
syl |
|
5 |
|
bdayfn |
|
6 |
|
ssrab2 |
|
7 |
|
sneq |
|
8 |
7
|
breq2d |
|
9 |
7
|
breq1d |
|
10 |
8 9
|
anbi12d |
|
11 |
|
simprl |
|
12 |
|
simprr1 |
|
13 |
|
simprr2 |
|
14 |
12 13
|
jca |
|
15 |
10 11 14
|
elrabd |
|
16 |
|
fnfvima |
|
17 |
5 6 15 16
|
mp3an12i |
|
18 |
|
intss1 |
|
19 |
17 18
|
syl |
|
20 |
4 19
|
eqsstrd |
|
21 |
|
simprr3 |
|
22 |
20 21
|
sstrd |
|
23 |
1 22
|
rexlimddv |
|