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| Mirrors > Home > MPE Home > Th. List > fdm | Structured version Visualization version Unicode version | ||
| Description: The domain of a mapping. (Contributed by NM, 2-Aug-1994.) |
| Ref | Expression |
|---|---|
| fdm |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ffn 6045 |
. 2
| |
| 2 | fndm 5990 |
. 2
| |
| 3 | 1, 2 | syl 17 |
1
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