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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 2662 | . . . . 5 ⊢ (∃!𝑥 𝐴𝐹𝑥 → ∃𝑥 𝐴𝐹𝑥) | |
2 | eldmg 5767 | . . . . 5 ⊢ (𝐴 ∈ V → (𝐴 ∈ dom 𝐹 ↔ ∃𝑥 𝐴𝐹𝑥)) | |
3 | 1, 2 | syl5ibr 248 | . . . 4 ⊢ (𝐴 ∈ V → (∃!𝑥 𝐴𝐹𝑥 → 𝐴 ∈ dom 𝐹)) |
4 | 3 | con3d 155 | . . 3 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → ¬ ∃!𝑥 𝐴𝐹𝑥)) |
5 | tz6.12-2 6660 | . . 3 ⊢ (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹‘𝐴) = ∅) | |
6 | 4, 5 | syl6 35 | . 2 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
7 | fvprc 6663 | . . 3 ⊢ (¬ 𝐴 ∈ V → (𝐹‘𝐴) = ∅) | |
8 | 7 | a1d 25 | . 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 1537 ∃wex 1780 ∈ wcel 2114 ∃!weu 2653 Vcvv 3494 ∅c0 4291 class class class wbr 5066 dom cdm 5555 ‘cfv 6355 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-nul 5210 ax-pow 5266 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4839 df-br 5067 df-dm 5565 df-iota 6314 df-fv 6363 |
This theorem is referenced by: ndmfvrcl 6701 elfvdm 6702 nfvres 6706 fvfundmfvn0 6708 0fv 6709 funfv 6750 fvun1 6754 fvco4i 6762 fvmpti 6767 mptrcl 6777 fvmptss 6780 fvmptex 6782 fvmptnf 6790 fvmptss2 6793 elfvmptrab1 6795 fvopab4ndm 6797 f0cli 6864 funiunfv 7007 ovprc 7194 oprssdm 7329 nssdmovg 7330 ndmovg 7331 1st2val 7717 2nd2val 7718 brovpreldm 7784 smofvon2 7993 rdgsucmptnf 8065 frsucmptn 8074 brwitnlem 8132 undifixp 8498 r1tr 9205 rankvaln 9228 cardidm 9388 carden2a 9395 carden2b 9396 carddomi2 9399 sdomsdomcardi 9400 pm54.43lem 9428 alephcard 9496 alephnbtwn 9497 alephgeom 9508 cfub 9671 cardcf 9674 cflecard 9675 cfle 9676 cflim2 9685 cfidm 9697 itunisuc 9841 itunitc1 9842 ituniiun 9844 alephadd 9999 alephreg 10004 pwcfsdom 10005 cfpwsdom 10006 adderpq 10378 mulerpq 10379 uzssz 12265 ltweuz 13330 wrdsymb0 13901 lsw0 13917 swrd00 14006 swrd0 14020 pfx00 14036 pfx0 14037 sumz 15079 sumss 15081 sumnul 15115 prod1 15298 prodss 15301 divsfval 16820 cidpropd 16980 lubval 17594 glbval 17607 joinval 17615 meetval 17629 gsumpropd2lem 17889 mulgfval 18226 mpfrcl 20298 iscnp2 21847 setsmstopn 23088 tngtopn 23259 dvbsss 24500 perfdvf 24501 dchrrcl 25816 structiedg0val 26807 snstriedgval 26823 rgrx0nd 27376 vsfval 28410 dmadjrnb 29683 hmdmadj 29717 funeldmb 33006 rdgprc0 33038 soseq 33096 nofv 33164 sltres 33169 noseponlem 33171 noextenddif 33175 noextendlt 33176 noextendgt 33177 nolesgn2ores 33179 fvnobday 33183 nosepdmlem 33187 nosepssdm 33190 nosupbnd1lem3 33210 nosupbnd1lem5 33212 nosupbnd2lem1 33215 fullfunfv 33408 linedegen 33604 bj-inftyexpitaudisj 34490 bj-inftyexpidisj 34495 bj-fvimacnv0 34571 dibvalrel 38314 dicvalrelN 38336 dihvalrel 38430 itgocn 39813 r1rankcld 40616 grur1cld 40617 uz0 41735 climfveq 41999 climfveqf 42010 afv2ndeffv0 43508 fvmptrabdm 43541 setrec2lem1 44845 |
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