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Related theorems Unicode version |
| Description: Equality theorem for function value. |
| Ref | Expression |
|---|---|
| fveq2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sneq 2462 |
. . . . . 6
| |
| 2 | 1 | imaeq2d 3467 |
. . . . 5
|
| 3 | 2 | eqeq1d 1520 |
. . . 4
|
| 4 | 3 | abbidv 1614 |
. . 3
|
| 5 | 4 | unieqd 2560 |
. 2
|
| 6 | df-fv 3253 |
. 2
| |
| 7 | df-fv 3253 |
. 2
| |
| 8 | 5, 6, 7 | 3eqtr4g 1568 |
1
|