Step |
Hyp |
Ref |
Expression |
1 |
|
psgnfzto1st.d |
|
2 |
|
psgnfzto1st.p |
|
3 |
|
simpll |
|
4 |
|
simpr |
|
5 |
3 4
|
eqtr4d |
|
6 |
|
simpr |
|
7 |
|
simplll |
|
8 |
6 7
|
breqtrd |
|
9 |
|
simpllr |
|
10 |
9 1
|
eleqtrdi |
|
11 |
|
elfzle1 |
|
12 |
10 11
|
syl |
|
13 |
|
fz1ssnn |
|
14 |
13 10
|
sselid |
|
15 |
14
|
nnred |
|
16 |
|
1red |
|
17 |
15 16
|
letri3d |
|
18 |
8 12 17
|
mpbir2and |
|
19 |
|
simplr |
|
20 |
18 19
|
pm2.21dd |
|
21 |
|
eqidd |
|
22 |
20 21
|
ifeqda |
|
23 |
5 22
|
ifeqda |
|
24 |
23
|
mpteq2dva |
|
25 |
|
mptresid |
|
26 |
24 2 25
|
3eqtr4g |
|