Step |
Hyp |
Ref |
Expression |
1 |
|
isuhgr.v |
|
2 |
|
isuhgr.e |
|
3 |
|
df-ushgr |
|
4 |
3
|
eleq2i |
|
5 |
|
fveq2 |
|
6 |
5 2
|
eqtr4di |
|
7 |
5
|
dmeqd |
|
8 |
2
|
eqcomi |
|
9 |
8
|
dmeqi |
|
10 |
7 9
|
eqtrdi |
|
11 |
|
fveq2 |
|
12 |
11 1
|
eqtr4di |
|
13 |
12
|
pweqd |
|
14 |
13
|
difeq1d |
|
15 |
6 10 14
|
f1eq123d |
|
16 |
|
fvexd |
|
17 |
|
fveq2 |
|
18 |
|
fvexd |
|
19 |
|
fveq2 |
|
20 |
19
|
adantr |
|
21 |
|
simpr |
|
22 |
21
|
dmeqd |
|
23 |
|
simpr |
|
24 |
23
|
pweqd |
|
25 |
24
|
difeq1d |
|
26 |
25
|
adantr |
|
27 |
21 22 26
|
f1eq123d |
|
28 |
18 20 27
|
sbcied2 |
|
29 |
16 17 28
|
sbcied2 |
|
30 |
29
|
cbvabv |
|
31 |
15 30
|
elab2g |
|
32 |
4 31
|
syl5bb |
|