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| Mirrors > Home > ILE Home > Th. List > ffvelcdm | GIF version | ||
| Description: A function's value belongs to its codomain. (Contributed by NM, 12-Aug-1999.) |
| Ref | Expression |
|---|---|
| ffvelcdm | ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ∈ 𝐴) → (𝐹‘𝐶) ∈ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ffn 5473 | . . 3 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴) | |
| 2 | fnfvelrn 5769 | . . 3 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐶 ∈ 𝐴) → (𝐹‘𝐶) ∈ ran 𝐹) | |
| 3 | 1, 2 | sylan 283 | . 2 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ∈ 𝐴) → (𝐹‘𝐶) ∈ ran 𝐹) |
| 4 | frn 5482 | . . . 4 ⊢ (𝐹:𝐴⟶𝐵 → ran 𝐹 ⊆ 𝐵) | |
| 5 | 4 | sseld 3223 | . . 3 ⊢ (𝐹:𝐴⟶𝐵 → ((𝐹‘𝐶) ∈ ran 𝐹 → (𝐹‘𝐶) ∈ 𝐵)) |
| 6 | 5 | adantr 276 | . 2 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ∈ 𝐴) → ((𝐹‘𝐶) ∈ ran 𝐹 → (𝐹‘𝐶) ∈ 𝐵)) |
| 7 | 3, 6 | mpd 13 | 1 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ∈ 𝐴) → (𝐹‘𝐶) ∈ 𝐵) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2200 ran crn 4720 Fn wfn 5313 ⟶wf 5314 ‘cfv 5318 |
| 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 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4258 ax-pr 4293 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2801 df-sbc 3029 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-br 4084 df-opab 4146 df-id 4384 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-rn 4730 df-iota 5278 df-fun 5320 df-fn 5321 df-f 5322 df-fv 5326 |
| This theorem is referenced by: ffvelcdmi 5771 ffvelcdmda 5772 dffo3 5784 ffnfv 5795 ffvresb 5800 fcompt 5807 fsn2 5811 fvconst 5831 foco2 5883 fcofo 5914 cocan1 5917 isocnv 5941 isores2 5943 isopolem 5952 isosolem 5954 fovcdm 6154 off 6237 mapsncnv 6850 2dom 6966 dom1o 6985 enm 6987 xpdom2 6998 xpmapenlem 7018 fiintim 7104 isotilem 7184 updjudhf 7257 exmidomniim 7319 finacn 7397 seqf1og 10755 shftf 11357 summodclem2a 11908 isumcl 11952 mertenslem2 12063 3dvds 12391 nn0seqcvgd 12579 algrf 12583 eucalg 12597 phimullem 12763 pcmpt 12882 pcprod 12885 imasaddfnlemg 13363 imasaddflemg 13365 mhmpropd 13515 ghmsub 13804 znunit 14639 upxp 14962 uptx 14964 txhmeo 15009 cncfmet 15282 dvaddxxbr 15391 dvcj 15399 dvfre 15400 plyf 15427 plyaddlem 15439 plymullem 15440 plycolemc 15448 plyreres 15454 dvply1 15455 lgsdir 15730 lgsdi 15732 lgseisenlem3 15767 bj-charfunr 16256 |
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