Step |
Hyp |
Ref |
Expression |
1 |
|
psgnfzto1st.d |
|
2 |
|
psgnfzto1st.p |
|
3 |
|
psgnfzto1st.g |
|
4 |
|
psgnfzto1st.b |
|
5 |
1 2
|
fzto1stfv1 |
|
6 |
5
|
fveq2d |
|
7 |
1 2 3 4
|
fzto1st |
|
8 |
3 4
|
symgbasf1o |
|
9 |
7 8
|
syl |
|
10 |
|
elfzuz2 |
|
11 |
10 1
|
eleq2s |
|
12 |
|
eluzfz1 |
|
13 |
12 1
|
eleqtrrdi |
|
14 |
11 13
|
syl |
|
15 |
|
f1ocnvfv1 |
|
16 |
9 14 15
|
syl2anc |
|
17 |
6 16
|
eqtr3d |
|