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| Mirrors > Home > MPE Home > Th. List > ffvelrn | Structured version Visualization version Unicode version | ||
| Description: A function's value belongs to its codomain. (Contributed by NM, 12-Aug-1999.) |
| Ref | Expression |
|---|---|
| ffvelrn |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ffn 6045 |
. . 3
| |
| 2 | fnfvelrn 6356 |
. . 3
| |
| 3 | 1, 2 | sylan 488 |
. 2
|
| 4 | frn 6053 |
. . . 4
| |
| 5 | 4 | sseld 3602 |
. . 3
|
| 6 | 5 | adantr 481 |
. 2
|
| 7 | 3, 6 | mpd 15 |
1
|
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