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| Mirrors > Home > MPE Home > Th. List > cnvimass | Structured version Visualization version GIF version | ||
| Description: A preimage under any class is included in the domain of the class. (Contributed by FL, 29-Jan-2007.) |
| Ref | Expression |
|---|---|
| cnvimass | ⊢ (◡𝐴 “ 𝐵) ⊆ dom 𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | imassrn 6063 | . 2 ⊢ (◡𝐴 “ 𝐵) ⊆ ran ◡𝐴 | |
| 2 | dfdm4 5880 | . 2 ⊢ dom 𝐴 = ran ◡𝐴 | |
| 3 | 1, 2 | sseqtrri 4013 | 1 ⊢ (◡𝐴 “ 𝐵) ⊆ dom 𝐴 |
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