Description: Next, we calculate the domain of T . This is mostly to change bound variables. (Contributed by Scott Fenton, 8-Aug-2024)
Ref | Expression | ||
---|---|---|---|
Hypothesis | noinfdm.1 | |
|
Assertion | noinfdm | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noinfdm.1 | |
|
2 | iffalse | |
|
3 | 1 2 | eqtrid | |
4 | 3 | dmeqd | |
5 | iotaex | |
|
6 | eqid | |
|
7 | 5 6 | dmmpti | |
8 | eleq1w | |
|
9 | suceq | |
|
10 | 9 | reseq2d | |
11 | 9 | reseq2d | |
12 | 10 11 | eqeq12d | |
13 | 12 | imbi2d | |
14 | 13 | ralbidv | |
15 | 8 14 | anbi12d | |
16 | 15 | rexbidv | |
17 | dmeq | |
|
18 | 17 | eleq2d | |
19 | breq1 | |
|
20 | 19 | notbid | |
21 | reseq1 | |
|
22 | 21 | eqeq1d | |
23 | 20 22 | imbi12d | |
24 | 23 | ralbidv | |
25 | breq2 | |
|
26 | 25 | notbid | |
27 | reseq1 | |
|
28 | 27 | eqeq2d | |
29 | 26 28 | imbi12d | |
30 | 29 | cbvralvw | |
31 | 24 30 | bitrdi | |
32 | 18 31 | anbi12d | |
33 | 32 | cbvrexvw | |
34 | 16 33 | bitrdi | |
35 | 34 | cbvabv | |
36 | 7 35 | eqtri | |
37 | 4 36 | eqtrdi | |