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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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