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| Mirrors > Home > ILE Home > Th. List > oveq2 | Unicode version | ||
| Description: Equality theorem for operation value. (Contributed by NM, 28-Feb-1995.) | 
| Ref | Expression | 
|---|---|
| oveq2 | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | opeq2 3809 | 
. . 3
 | |
| 2 | 1 | fveq2d 5562 | 
. 2
 | 
| 3 | df-ov 5925 | 
. 2
 | |
| 4 | df-ov 5925 | 
. 2
 | |
| 5 | 2, 3, 4 | 3eqtr4g 2254 | 
1
 | 
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