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| Mirrors > Home > MPE Home > Th. List > fss | Structured version Visualization version Unicode version | ||
| Description: Expanding the codomain of a mapping. (Contributed by NM, 10-May-1998.) (Proof shortened by Andrew Salmon, 17-Sep-2011.) |
| Ref | Expression |
|---|---|
| fss |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sstr2 3610 |
. . . . 5
| |
| 2 | 1 | com12 32 |
. . . 4
|
| 3 | 2 | anim2d 589 |
. . 3
|
| 4 | df-f 5892 |
. . 3
| |
| 5 | df-f 5892 |
. . 3
| |
| 6 | 3, 4, 5 | 3imtr4g 285 |
. 2
|
| 7 | 6 | impcom 446 |
1
|
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