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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 5536 | . . 3 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴) | |
| 2 | fnfvelrn 5843 | . . 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 5545 | . . . 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 4777 Fn wfn 5375 ⟶wf 5376 ‘cfv 5380 |
| 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 4251 ax-pow 4313 ax-pr 4348 |
| 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 4132 df-opab 4194 df-id 4440 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-rn 4787 df-iota 5340 df-fun 5382 df-fn 5383 df-f 5384 df-fv 5388 |
| This theorem is used by: ffvelcdmi 5845 ffvelcdmda 5846 dffo3 5858 ffnfv 5869 ffvresb 5874 fcompt 5881 fsn2 5885 fvconst 5906 foco2 5962 fcofo 5993 cocan1 5996 isocnv 6020 isores2 6022 isopolem 6031 isosolem 6033 fovcdm 6235 off 6319 mapsncnv 6981 2dom 7097 dom1o 7120 enm 7122 xpdom2 7133 xpmapenlem 7153 fiintim 7242 isotilem 7352 updjudhf 7425 exmidomniim 7487 finacn 7566 seqf1og 10979 hashf1lem1 11307 shftf 11617 summodclem2a 12173 isumcl 12217 mertenslem2 12328 3dvds 12656 nn0seqcvgd 12844 algrf 12848 eucalg 12862 phimullem 13032 pcmpt 13151 pcprod 13154 imasaddfnlemg 13694 imasaddflemg 13696 mhmpropd 13832 ghmsub 14113 cntzmhm 14173 znunit 15103 upxp 15498 uptx 15500 txhmeo 15545 cncfmet 15818 dvaddxxbr 15927 dvcj 15935 dvfre 15936 plyf 15963 plyaddlem 15975 plymullem 15976 plycolemc 15984 plyreres 15990 dvply1 15991 bposlem5 16315 lgsdir 16359 lgsdi 16361 lgseisenlem3 16396 wlkpvtx 16820 wlkepvtx 16821 bj-charfunr 17041 |
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