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Mirrors > Home > MPE Home > Th. List > elfvdm | Structured version Visualization version GIF version |
Description: If a function value has a member, the argument belongs to the domain. (Contributed by NM, 12-Feb-2007.) |
Ref | Expression |
---|---|
elfvdm | ⊢ (𝐴 ∈ (𝐹‘𝐵) → 𝐵 ∈ dom 𝐹) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ne0i 3921 | . 2 ⊢ (𝐴 ∈ (𝐹‘𝐵) → (𝐹‘𝐵) ≠ ∅) | |
2 | ndmfv 6218 | . . 3 ⊢ (¬ 𝐵 ∈ dom 𝐹 → (𝐹‘𝐵) = ∅) | |
3 | 2 | necon1ai 2821 | . 2 ⊢ ((𝐹‘𝐵) ≠ ∅ → 𝐵 ∈ dom 𝐹) |
4 | 1, 3 | syl 17 | 1 ⊢ (𝐴 ∈ (𝐹‘𝐵) → 𝐵 ∈ dom 𝐹) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 1990 ≠ wne 2794 ∅c0 3915 dom cdm 5114 ‘cfv 5888 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-nul 4789 ax-pow 4843 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-dm 5124 df-iota 5851 df-fv 5896 |
This theorem is referenced by: elfvex 6221 fveqdmss 6354 eldmrexrnb 6366 elmpt2cl 6876 elovmpt3rab1 6893 mpt2xeldm 7337 mpt2xopn0yelv 7339 mpt2xopxnop0 7341 r1pwss 8647 rankwflemb 8656 r1elwf 8659 rankr1ai 8661 rankdmr1 8664 rankr1ag 8665 rankr1c 8684 r1pwcl 8710 cardne 8791 cardsdomelir 8799 r1wunlim 9559 eluzel2 11692 bitsval 15146 acsfiel 16315 subcrcl 16476 homarcl2 16685 arwrcl 16694 pleval2i 16964 acsdrscl 17170 acsficl 17171 submrcl 17346 gsumws1 17376 issubg 17594 isnsg 17623 cntzrcl 17760 eldprd 18403 isunit 18657 isirred 18699 abvrcl 18821 lbsss 19077 lbssp 19079 lbsind 19080 ply1frcl 19683 elocv 20012 cssi 20028 isobs 20064 linds1 20149 linds2 20150 lindsind 20156 eltg4i 20764 eltg3 20766 tg1 20768 tg2 20769 cldrcl 20830 neiss2 20905 lmrcl 21035 iscnp2 21043 islocfin 21320 kgeni 21340 kqtop 21548 fbasne0 21634 0nelfb 21635 fbsspw 21636 fbasssin 21640 fbun 21644 trfbas2 21647 trfbas 21648 isfil 21651 filss 21657 fbasweak 21669 fgval 21674 elfg 21675 fgcl 21682 isufil 21707 ufilss 21709 trufil 21714 fmval 21747 elfm3 21754 fmfnfmlem4 21761 fmfnfm 21762 elrnust 22028 metflem 22133 xmetf 22134 xmeteq0 22143 xmettri2 22145 xmetres2 22166 blfvalps 22188 blvalps 22190 blval 22191 blfps 22211 blf 22212 isxms2 22253 tmslem 22287 metuval 22354 isphtpc 22793 lmmbr2 23057 lmmbrf 23060 cfili 23066 fmcfil 23070 cfilfcls 23072 iscau2 23075 iscauf 23078 caucfil 23081 cmetcaulem 23086 iscmet3 23091 cfilresi 23093 caussi 23095 causs 23096 metcld2 23105 cmetss 23113 bcthlem1 23121 bcth3 23128 cpncn 23699 cpnres 23700 plybss 23950 tglngne 25445 wlkdlem3 26581 1wlkdlem3 26999 elunirn2 29451 fpwrelmap 29508 metidval 29933 pstmval 29938 brsiga 30246 measbase 30260 cvmsrcl 31246 snmlval 31313 fneuni 32342 uncf 33388 unccur 33392 caures 33556 ismtyval 33599 isismty 33600 heiborlem10 33619 eldiophb 37320 elmnc 37706 issdrg 37767 submgmrcl 41782 elbigofrcl 42344 |
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