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| Mirrors > Home > ILE Home > Th. List > foima | GIF version | ||
| Description: The image of the domain of an onto function. (Contributed by NM, 29-Nov-2002.) |
| Ref | Expression |
|---|---|
| foima | ⊢ (𝐹:𝐴–onto→𝐵 → (𝐹 “ 𝐴) = 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | imadmrn 5051 | . 2 ⊢ (𝐹 “ dom 𝐹) = ran 𝐹 | |
| 2 | fof 5520 | . . . 4 ⊢ (𝐹:𝐴–onto→𝐵 → 𝐹:𝐴⟶𝐵) | |
| 3 | fdm 5451 | . . . 4 ⊢ (𝐹:𝐴⟶𝐵 → dom 𝐹 = 𝐴) | |
| 4 | 2, 3 | syl 14 | . . 3 ⊢ (𝐹:𝐴–onto→𝐵 → dom 𝐹 = 𝐴) |
| 5 | 4 | imaeq2d 5041 | . 2 ⊢ (𝐹:𝐴–onto→𝐵 → (𝐹 “ dom 𝐹) = (𝐹 “ 𝐴)) |
| 6 | forn 5523 | . 2 ⊢ (𝐹:𝐴–onto→𝐵 → ran 𝐹 = 𝐵) | |
| 7 | 1, 5, 6 | 3eqtr3a 2264 | 1 ⊢ (𝐹:𝐴–onto→𝐵 → (𝐹 “ 𝐴) = 𝐵) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1373 dom cdm 4693 ran crn 4694 “ cima 4696 ⟶wf 5286 –onto→wfo 5288 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-14 2181 ax-ext 2189 ax-sep 4178 ax-pow 4234 ax-pr 4269 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2194 df-cleq 2200 df-clel 2203 df-nfc 2339 df-ral 2491 df-rex 2492 df-v 2778 df-un 3178 df-in 3180 df-ss 3187 df-pw 3628 df-sn 3649 df-pr 3650 df-op 3652 df-br 4060 df-opab 4122 df-xp 4699 df-cnv 4701 df-dm 4703 df-rn 4704 df-res 4705 df-ima 4706 df-fn 5293 df-f 5294 df-fo 5296 |
| This theorem is referenced by: foimacnv 5562 foima2 5843 fiintim 7054 fidcenumlemr 7083 |
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