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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 5533 | . . 3 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴) | |
| 2 | fnfvelrn 5840 | . . 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 5542 | . . . 4 ⊢ (𝐹:𝐴⟶𝐵 → ran 𝐹 ⊆ 𝐵) | |
| 5 | 4 | sseld 3247 | . . 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 |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ∈ wcel 2209 ran crn 4775 Fn wfn 5372 ⟶wf 5373 ‘cfv 5377 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-sbc 3052 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4131 df-opab 4193 df-id 4438 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-iota 5337 df-fun 5379 df-fn 5380 df-f 5381 df-fv 5385 |
| This theorem is used by: ffvelcdmi 5842 ffvelcdmda 5843 dffo3 5855 ffnfv 5866 ffvresb 5871 fcompt 5878 fsn2 5882 fvconst 5903 foco2 5959 fcofo 5990 cocan1 5993 isocnv 6017 isores2 6019 isopolem 6028 isosolem 6030 fovcdm 6232 off 6315 mapsncnv 6977 2dom 7093 dom1o 7116 enm 7118 xpdom2 7129 xpmapenlem 7149 fiintim 7238 isotilem 7347 updjudhf 7420 exmidomniim 7482 finacn 7561 seqf1og 10973 hashf1lem1 11301 shftf 11611 summodclem2a 12167 isumcl 12211 mertenslem2 12322 3dvds 12650 nn0seqcvgd 12838 algrf 12842 eucalg 12856 phimullem 13026 pcmpt 13145 pcprod 13148 imasaddfnlemg 13688 imasaddflemg 13690 mhmpropd 13826 ghmsub 14107 cntzmhm 14167 znunit 15078 upxp 15464 uptx 15466 txhmeo 15511 cncfmet 15784 dvaddxxbr 15893 dvcj 15901 dvfre 15902 plyf 15929 plyaddlem 15941 plymullem 15942 plycolemc 15950 plyreres 15956 dvply1 15957 bposlem5 16276 lgsdir 16320 lgsdi 16322 lgseisenlem3 16357 wlkpvtx 16781 wlkepvtx 16782 bj-charfunr 17002 |
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