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| Mirrors > Home > MPE Home > Th. List > ndmfv | Structured version Visualization version GIF version | ||
| Description: The value of a class outside its domain is the empty set. (An artifact of our function value definition.) (Contributed by NM, 24-Aug-1995.) |
| Ref | Expression |
|---|---|
| ndmfv | ⊢ (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | euex 2611 | . . . . 5 ⊢ (∃!𝑥 𝐴𝐹𝑥 → ∃𝑥 𝐴𝐹𝑥) | |
| 2 | eldmg 5889 | . . . . 5 ⊢ (𝐴 ∈ V → (𝐴 ∈ dom 𝐹 ↔ ∃𝑥 𝐴𝐹𝑥)) | |
| 3 | 1, 2 | imbitrrid 249 | . . . 4 ⊢ (𝐴 ∈ V → (∃!𝑥 𝐴𝐹𝑥 → 𝐴 ∈ dom 𝐹)) |
| 4 | 3 | con3d 153 | . . 3 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → ¬ ∃!𝑥 𝐴𝐹𝑥)) |
| 5 | tz6.12-2 6869 | . . 3 ⊢ (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹‘𝐴) = ∅) | |
| 6 | 4, 5 | syl6 36 | . 2 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
| 7 | fvprc 6874 | . . 3 ⊢ (¬ 𝐴 ∈ V → (𝐹‘𝐴) = ∅) | |
| 8 | 7 | a1d 26 | . 2 ⊢ (¬ 𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
| 9 | 6, 8 | pm2.61i 184 | 1 ⊢ (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1567 ∃wex 1806 ∈ wcel 2149 ∃!weu 2602 Vcvv 3463 ∅c0 4294 class class class wbr 5113 dom cdm 5662 ‘cfv 6537 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 ax-nul 5271 ax-pr 5405 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-ne 2965 df-rab 3424 df-v 3465 df-dif 3916 df-un 3918 df-ss 3930 df-nul 4295 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-br 5114 df-dm 5672 df-iota 6493 df-fv 6545 |
| This theorem is referenced by: ndmfvrcl 6915 elfvdm 6916 nfvres 6920 fvfundmfvn0 6922 0fv 6923 funfv 6969 fvun1 6973 fvco4i 6984 fvmpti 6989 mptrcl 7000 fvmptss 7003 fvmptex 7005 fvmptnf 7013 fvmptss2 7017 elfvmptrab1 7019 fvopab4ndm 7021 f0cli 7094 funiunfv 7247 funeldmb 7358 ovprc 7449 oprssdm 7592 nssdmovg 7593 ndmovg 7594 1st2val 8013 2nd2val 8014 brovpreldm 8083 soseq 8154 smofvon2 8342 rdgsucmptnf 8415 frsucmptn 8425 brwitnlem 8491 undifixp 8931 r1tr 9747 rankvaln 9770 cardidm 9944 carden2a 9951 carden2b 9952 carddomi2 9955 sdomsdomcardi 9956 pm54.43lem 9985 alephcard 10053 alephnbtwn 10054 alephgeom 10065 cfub 10231 cardcf 10234 cflecard 10235 cfle 10236 cflim2 10246 cfidm 10258 itunisuc 10402 itunitc1 10403 ituniiun 10405 alephadd 10561 alephreg 10566 pwcfsdom 10567 cfpwsdom 10568 adderpq 10940 mulerpq 10941 uzssz 12882 ltweuz 13996 wrdsymb0 14585 lsw0 14601 swrd00 14681 swrd0 14695 pfx00 14711 pfx0 14712 sumz 15772 sumss 15774 sumnul 15810 prod1 15997 prodss 16000 divsfval 17600 cidpropd 17765 lubval 18409 glbval 18422 joinval 18430 meetval 18444 gsumpropd2lem 18736 mulgfval 19134 mpfrcl 22204 iscnp2 23364 setsmstopn 24603 tngtopn 24775 dvbsss 26029 perfdvf 26030 dchrrcl 27369 nofv 27786 ltsres 27791 noseponlem 27793 noextenddif 27797 noextendlt 27798 noextendgt 27799 nolesgn2ores 27801 nogesgn1ores 27803 fvnobday 27807 nosepdmlem 27812 nosepssdm 27815 nosupbnd1lem3 27839 nosupbnd1lem5 27841 nosupbnd2lem1 27844 noinfbnd1lem3 27854 noinfbnd1lem5 27856 noinfbnd2lem1 27859 newval 27993 leftval 28007 rightval 28008 lltr 28020 madess 28024 oldssmade 28025 oldss 28028 lrold 28055 structiedg0val 29312 snstriedgval 29328 rgrx0nd 29884 vsfval 30925 dmadjrnb 32198 hmdmadj 32232 r1wf 35431 rdgprc0 36181 fullfunfv 36337 linedegen 36533 bj-inftyexpitaudisj 37736 bj-inftyexpidisj 37741 bj-fvimacnv0 37817 dibvalrel 41826 dicvalrelN 41848 dihvalrel 41942 itgocn 43782 fpwfvss 44029 r1rankcld 44846 grur1cld 44847 uz0 46017 climfveq 46274 climfveqf 46285 afv2ndeffv0 47885 fvmptrabdm 47918 fvconstr 49524 fvconstrn0 49525 fvconstr2 49526 fvconst0ci 49553 fvconstdomi 49554 ipolub00 49655 oppfrcl 49790 initopropdlemlem 49901 initopropd 49905 termopropd 49906 zeroopropd 49907 fucofvalne 49987 |
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