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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 5479 | . . 3 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴) | |
| 2 | fnfvelrn 5775 | . . 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 5488 | . . . 4 ⊢ (𝐹:𝐴⟶𝐵 → ran 𝐹 ⊆ 𝐵) | |
| 5 | 4 | sseld 3224 | . . 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 4724 Fn wfn 5319 ⟶wf 5320 ‘cfv 5324 |
| 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 4205 ax-pow 4262 ax-pr 4297 |
| 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 2802 df-sbc 3030 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-br 4087 df-opab 4149 df-id 4388 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-rn 4734 df-iota 5284 df-fun 5326 df-fn 5327 df-f 5328 df-fv 5332 |
| This theorem is referenced by: ffvelcdmi 5777 ffvelcdmda 5778 dffo3 5790 ffnfv 5801 ffvresb 5806 fcompt 5813 fsn2 5817 fvconst 5837 foco2 5889 fcofo 5920 cocan1 5923 isocnv 5947 isores2 5949 isopolem 5958 isosolem 5960 fovcdm 6160 off 6243 mapsncnv 6859 2dom 6975 dom1o 6997 enm 6999 xpdom2 7010 xpmapenlem 7030 fiintim 7116 isotilem 7196 updjudhf 7269 exmidomniim 7331 finacn 7409 seqf1og 10773 shftf 11381 summodclem2a 11932 isumcl 11976 mertenslem2 12087 3dvds 12415 nn0seqcvgd 12603 algrf 12607 eucalg 12621 phimullem 12787 pcmpt 12906 pcprod 12909 imasaddfnlemg 13387 imasaddflemg 13389 mhmpropd 13539 ghmsub 13828 znunit 14663 upxp 14986 uptx 14988 txhmeo 15033 cncfmet 15306 dvaddxxbr 15415 dvcj 15423 dvfre 15424 plyf 15451 plyaddlem 15463 plymullem 15464 plycolemc 15472 plyreres 15478 dvply1 15479 lgsdir 15754 lgsdi 15756 lgseisenlem3 15791 bj-charfunr 16341 |
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