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| Mirrors > Home > ILE Home > Th. List > oveq1 | Unicode version | ||
| Description: Equality theorem for operation value. (Contributed by NM, 28-Feb-1995.) |
| Ref | Expression |
|---|---|
| oveq1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opeq1 3809 |
. . 3
| |
| 2 | 1 | fveq2d 5565 |
. 2
|
| 3 | df-ov 5928 |
. 2
| |
| 4 | df-ov 5928 |
. 2
| |
| 5 | 2, 3, 4 | 3eqtr4g 2254 |
1
|
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