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| Mirrors > Home > MPE Home > Th. List > cnvimass | Structured version Visualization version Unicode version | ||
| Description: A preimage under any class is included in the domain of the class. (Contributed by FL, 29-Jan-2007.) |
| Ref | Expression |
|---|---|
| cnvimass |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | imassrn 5477 |
. 2
| |
| 2 | dfdm4 5316 |
. 2
| |
| 3 | 1, 2 | sseqtr4i 3638 |
1
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