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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 5983 | . 2 ⊢ (◡𝐴 “ 𝐵) ⊆ ran ◡𝐴 | |
2 | dfdm4 5807 | . 2 ⊢ dom 𝐴 = ran ◡𝐴 | |
3 | 1, 2 | sseqtrri 3959 | 1 ⊢ (◡𝐴 “ 𝐵) ⊆ dom 𝐴 |
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