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| Mirrors > Home > ILE Home > Th. List > fveq1 | Unicode version | ||
| Description: Equality theorem for function value. (Contributed by NM, 29-Dec-1996.) | 
| Ref | Expression | 
|---|---|
| fveq1 | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | breq 4035 | 
. . 3
 | |
| 2 | 1 | iotabidv 5241 | 
. 2
 | 
| 3 | df-fv 5266 | 
. 2
 | |
| 4 | df-fv 5266 | 
. 2
 | |
| 5 | 2, 3, 4 | 3eqtr4g 2254 | 
1
 | 
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