Step |
Hyp |
Ref |
Expression |
1 |
|
diffi |
|
2 |
1
|
adantl |
|
3 |
|
simpl |
|
4 |
|
inss1 |
|
5 |
|
ssfi |
|
6 |
3 4 5
|
sylancl |
|
7 |
|
sslin |
|
8 |
4 7
|
ax-mp |
|
9 |
|
incom |
|
10 |
|
disjdif |
|
11 |
9 10
|
eqtri |
|
12 |
|
sseq0 |
|
13 |
8 11 12
|
mp2an |
|
14 |
13
|
a1i |
|
15 |
|
hashun |
|
16 |
2 6 14 15
|
syl3anc |
|
17 |
|
incom |
|
18 |
17
|
uneq2i |
|
19 |
|
uncom |
|
20 |
|
inundif |
|
21 |
18 19 20
|
3eqtri |
|
22 |
21
|
a1i |
|
23 |
22
|
fveq2d |
|
24 |
16 23
|
eqtr3d |
|
25 |
|
hashcl |
|
26 |
25
|
adantl |
|
27 |
26
|
nn0cnd |
|
28 |
|
hashcl |
|
29 |
6 28
|
syl |
|
30 |
29
|
nn0cnd |
|
31 |
|
hashcl |
|
32 |
2 31
|
syl |
|
33 |
32
|
nn0cnd |
|
34 |
27 30 33
|
subadd2d |
|
35 |
24 34
|
mpbird |
|
36 |
35
|
oveq2d |
|
37 |
|
hashcl |
|
38 |
37
|
adantr |
|
39 |
38
|
nn0cnd |
|
40 |
39 27 30
|
addsubassd |
|
41 |
|
undif2 |
|
42 |
41
|
fveq2i |
|
43 |
10
|
a1i |
|
44 |
|
hashun |
|
45 |
3 2 43 44
|
syl3anc |
|
46 |
42 45
|
syl5eqr |
|
47 |
36 40 46
|
3eqtr4rd |
|