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| Mirrors > Home > MPE Home > Th. List > imassrn | Structured version Visualization version GIF version | ||
| Description: Any image by a class is included in the range of the class. Theorem 3.16(xi) of [Monk1] p. 39. (Contributed by NM, 31-Mar-1995.) (Proof shortened by BJ, 27-Sep-2026.) |
| Ref | Expression |
|---|---|
| imassrn | ⊢ (𝐴 “ 𝐵) ⊆ ran 𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssv 3932 | . . 3 ⊢ 𝐵 ⊆ V | |
| 2 | imass2 6054 | . . 3 ⊢ (𝐵 ⊆ V → (𝐴 “ 𝐵) ⊆ (𝐴 “ V)) | |
| 3 | 1, 2 | ax-mp 5 | . 2 ⊢ (𝐴 “ 𝐵) ⊆ (𝐴 “ V) |
| 4 | dfrn4 6196 | . 2 ⊢ ran 𝐴 = (𝐴 “ V) | |
| 5 | 3, 4 | sseqtrri 3957 | 1 ⊢ (𝐴 “ 𝐵) ⊆ ran 𝐴 |
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