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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 5886 | . . . . 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 6866 | . . 3 ⊢ (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹‘𝐴) = ∅) | |
| 6 | 4, 5 | syl6 36 | . 2 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
| 7 | fvprc 6871 | . . 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 5110 dom cdm 5659 ‘cfv 6533 |
| 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 5268 ax-pr 5402 |
| 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 4490 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-br 5111 df-dm 5669 df-iota 6489 df-fv 6541 |
| This theorem is referenced by: ndmfvrcl 6912 elfvdm 6913 nfvres 6917 fvfundmfvn0 6919 0fv 6920 funfv 6966 fvun1 6970 fvco4i 6981 fvmpti 6986 mptrcl 6997 fvmptss 7000 fvmptex 7002 fvmptnf 7010 fvmptss2 7014 elfvmptrab1 7016 fvopab4ndm 7018 f0cli 7091 funiunfv 7244 funeldmb 7355 ovprc 7446 oprssdm 7589 nssdmovg 7590 ndmovg 7591 1st2val 8010 2nd2val 8011 brovpreldm 8080 soseq 8151 smofvon2 8339 rdgsucmptnf 8412 frsucmptn 8422 brwitnlem 8488 undifixp 8928 r1tr 9744 rankvaln 9767 cardidm 9941 carden2a 9948 carden2b 9949 carddomi2 9952 sdomsdomcardi 9953 pm54.43lem 9982 alephcard 10050 alephnbtwn 10051 alephgeom 10062 cfub 10228 cardcf 10231 cflecard 10232 cfle 10233 cflim2 10243 cfidm 10255 itunisuc 10399 itunitc1 10400 ituniiun 10402 alephadd 10558 alephreg 10563 pwcfsdom 10564 cfpwsdom 10565 adderpq 10937 mulerpq 10938 uzssz 12879 ltweuz 13993 wrdsymb0 14582 lsw0 14598 swrd00 14678 swrd0 14692 pfx00 14708 pfx0 14709 sumz 15769 sumss 15771 sumnul 15807 prod1 15994 prodss 15997 divsfval 17597 cidpropd 17762 lubval 18406 glbval 18419 joinval 18427 meetval 18441 gsumpropd2lem 18733 mulgfval 19131 mpfrcl 22201 iscnp2 23361 setsmstopn 24600 tngtopn 24772 dvbsss 26026 perfdvf 26027 dchrrcl 27366 nofv 27783 ltsres 27788 noseponlem 27790 noextenddif 27794 noextendlt 27795 noextendgt 27796 nolesgn2ores 27798 nogesgn1ores 27800 fvnobday 27804 nosepdmlem 27809 nosepssdm 27812 nosupbnd1lem3 27836 nosupbnd1lem5 27838 nosupbnd2lem1 27841 noinfbnd1lem3 27851 noinfbnd1lem5 27853 noinfbnd2lem1 27856 newval 27990 leftval 28004 rightval 28005 lltr 28017 madess 28021 oldssmade 28022 oldss 28025 lrold 28052 structiedg0val 29309 snstriedgval 29325 rgrx0nd 29881 vsfval 30922 dmadjrnb 32195 hmdmadj 32229 r1wf 35428 rdgprc0 36178 fullfunfv 36334 linedegen 36530 bj-inftyexpitaudisj 37732 bj-inftyexpidisj 37737 bj-fvimacnv0 37813 dibvalrel 41822 dicvalrelN 41844 dihvalrel 41938 itgocn 43776 fpwfvss 44023 r1rankcld 44840 grur1cld 44841 uz0 46011 climfveq 46268 climfveqf 46279 afv2ndeffv0 47879 fvmptrabdm 47912 fvconstr 49518 fvconstrn0 49519 fvconstr2 49520 fvconst0ci 49547 fvconstdomi 49548 ipolub00 49649 oppfrcl 49784 initopropdlemlem 49895 initopropd 49899 termopropd 49900 zeroopropd 49901 fucofvalne 49981 |
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