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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 3991 | . . 3 | |
2 | 1 | iotabidv 5181 | . 2 |
3 | df-fv 5206 | . 2 | |
4 | df-fv 5206 | . 2 | |
5 | 2, 3, 4 | 3eqtr4g 2228 | 1 |
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