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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 3880 | . 2 ⊢ (𝐴 ∈ (𝐹‘𝐵) → (𝐹‘𝐵) ≠ ∅) | |
2 | ndmfv 6128 | . . 3 ⊢ (¬ 𝐵 ∈ dom 𝐹 → (𝐹‘𝐵) = ∅) | |
3 | 2 | necon1ai 2809 | . 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 1977 ≠ wne 2780 ∅c0 3874 dom cdm 5038 ‘cfv 5804 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-nul 4717 ax-pow 4769 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-dm 5048 df-iota 5768 df-fv 5812 |
This theorem is referenced by: elfvex 6131 fveqdmss 6262 eldmrexrnb 6274 elmpt2cl 6774 elovmpt3rab1 6791 mpt2xeldm 7224 mpt2xopn0yelv 7226 mpt2xopxnop0 7228 r1pwss 8530 rankwflemb 8539 r1elwf 8542 rankr1ai 8544 rankdmr1 8547 rankr1ag 8548 rankr1c 8567 r1pwcl 8593 cardne 8674 cardsdomelir 8682 r1wunlim 9438 eluzel2 11568 bitsval 14984 acsfiel 16138 subcrcl 16299 homarcl2 16508 arwrcl 16517 pleval2i 16787 acsdrscl 16993 acsficl 16994 submrcl 17169 gsumws1 17199 issubg 17417 isnsg 17446 cntzrcl 17583 eldprd 18226 isunit 18480 isirred 18522 abvrcl 18644 lbsss 18898 lbssp 18900 lbsind 18901 ply1frcl 19504 elocv 19831 cssi 19847 isobs 19883 linds1 19968 linds2 19969 lindsind 19975 eltg4i 20575 eltg3 20577 tg1 20579 tg2 20580 cldrcl 20640 neiss2 20715 lmrcl 20845 iscnp2 20853 islocfin 21130 kgeni 21150 kqtop 21358 fbasne0 21444 0nelfb 21445 fbsspw 21446 fbasssin 21450 fbun 21454 trfbas2 21457 trfbas 21458 isfil 21461 filss 21467 fbasweak 21479 fgval 21484 elfg 21485 fgcl 21492 isufil 21517 ufilss 21519 trufil 21524 fmval 21557 elfm3 21564 fmfnfmlem4 21571 fmfnfm 21572 elrnust 21838 metflem 21943 xmetf 21944 xmeteq0 21953 xmettri2 21955 xmetres2 21976 blfvalps 21998 blvalps 22000 blval 22001 blfps 22021 blf 22022 isxms2 22063 tmslem 22097 metuval 22164 isphtpc 22601 lmmbr2 22865 lmmbrf 22868 cfili 22874 fmcfil 22878 cfilfcls 22880 iscau2 22883 iscauf 22886 caucfil 22889 cmetcaulem 22894 iscmet3 22899 cfilresi 22901 caussi 22903 causs 22904 metcld2 22913 cmetss 22921 bcthlem1 22929 bcth3 22936 cpncn 23505 cpnres 23506 plybss 23754 tglngne 25245 2trllemF 26079 constr1trl 26118 elunirn2 28831 fpwrelmap 28896 metidval 29261 pstmval 29266 brsiga 29573 measbase 29587 cvmsrcl 30500 snmlval 30567 fneuni 31512 uncf 32558 unccur 32562 caures 32726 ismtyval 32769 isismty 32770 heiborlem10 32789 eldiophb 36338 elmnc 36725 issdrg 36786 1wlkdlem3 40893 11wlkdlem3 41306 submgmrcl 41572 elbigofrcl 42142 |
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