Step |
Hyp |
Ref |
Expression |
1 |
|
mndifsplit.b |
|
2 |
|
mndifsplit.0g |
|
3 |
|
mndifsplit.pg |
|
4 |
|
pm2.21 |
|
5 |
4
|
imp |
|
6 |
5
|
3ad2antl3 |
|
7 |
1 3 2
|
mndrid |
|
8 |
7
|
3adant3 |
|
9 |
8
|
adantr |
|
10 |
|
iftrue |
|
11 |
|
iffalse |
|
12 |
10 11
|
oveqan12d |
|
13 |
12
|
adantl |
|
14 |
|
iftrue |
|
15 |
14
|
orcs |
|
16 |
15
|
ad2antrl |
|
17 |
9 13 16
|
3eqtr4rd |
|
18 |
1 3 2
|
mndlid |
|
19 |
18
|
3adant3 |
|
20 |
19
|
adantr |
|
21 |
|
iffalse |
|
22 |
|
iftrue |
|
23 |
21 22
|
oveqan12d |
|
24 |
23
|
adantl |
|
25 |
14
|
olcs |
|
26 |
25
|
ad2antll |
|
27 |
20 24 26
|
3eqtr4rd |
|
28 |
|
simp1 |
|
29 |
1 2
|
mndidcl |
|
30 |
1 3 2
|
mndlid |
|
31 |
28 29 30
|
syl2anc2 |
|
32 |
31
|
adantr |
|
33 |
21 11
|
oveqan12d |
|
34 |
33
|
adantl |
|
35 |
|
ioran |
|
36 |
|
iffalse |
|
37 |
35 36
|
sylbir |
|
38 |
37
|
adantl |
|
39 |
32 34 38
|
3eqtr4rd |
|
40 |
6 17 27 39
|
4casesdan |
|