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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 2577 | . . . . 5 ⊢ (∃!𝑥 𝐴𝐹𝑥 → ∃𝑥 𝐴𝐹𝑥) | |
| 2 | eldmg 5847 | . . . . 5 ⊢ (𝐴 ∈ V → (𝐴 ∈ dom 𝐹 ↔ ∃𝑥 𝐴𝐹𝑥)) | |
| 3 | 1, 2 | imbitrrid 246 | . . . 4 ⊢ (𝐴 ∈ V → (∃!𝑥 𝐴𝐹𝑥 → 𝐴 ∈ dom 𝐹)) |
| 4 | 3 | con3d 152 | . . 3 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → ¬ ∃!𝑥 𝐴𝐹𝑥)) |
| 5 | tz6.12-2 6821 | . . 3 ⊢ (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹‘𝐴) = ∅) | |
| 6 | 4, 5 | syl6 35 | . 2 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
| 7 | fvprc 6826 | . . 3 ⊢ (¬ 𝐴 ∈ V → (𝐹‘𝐴) = ∅) | |
| 8 | 7 | a1d 25 | . 2 ⊢ (¬ 𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
| 9 | 6, 8 | pm2.61i 182 | 1 ⊢ (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1541 ∃wex 1780 ∈ wcel 2113 ∃!weu 2568 Vcvv 3440 ∅c0 4285 class class class wbr 5098 dom cdm 5624 ‘cfv 6492 |
| 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 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2708 ax-nul 5251 ax-pr 5377 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-rab 3400 df-v 3442 df-dif 3904 df-un 3906 df-ss 3918 df-nul 4286 df-if 4480 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-dm 5634 df-iota 6448 df-fv 6500 |
| This theorem is referenced by: ndmfvrcl 6867 elfvdm 6868 nfvres 6872 fvfundmfvn0 6874 0fv 6875 funfv 6921 fvun1 6925 fvco4i 6935 fvmpti 6940 mptrcl 6950 fvmptss 6953 fvmptex 6955 fvmptnf 6963 fvmptss2 6967 elfvmptrab1 6969 fvopab4ndm 6971 f0cli 7043 funiunfv 7194 funeldmb 7305 ovprc 7396 oprssdm 7539 nssdmovg 7540 ndmovg 7541 1st2val 7961 2nd2val 7962 brovpreldm 8031 soseq 8101 smofvon2 8288 rdgsucmptnf 8360 frsucmptn 8370 brwitnlem 8434 undifixp 8872 r1tr 9688 rankvaln 9711 cardidm 9871 carden2a 9878 carden2b 9879 carddomi2 9882 sdomsdomcardi 9883 pm54.43lem 9912 alephcard 9980 alephnbtwn 9981 alephgeom 9992 cfub 10159 cardcf 10162 cflecard 10163 cfle 10164 cflim2 10173 cfidm 10185 itunisuc 10329 itunitc1 10330 ituniiun 10332 alephadd 10488 alephreg 10493 pwcfsdom 10494 cfpwsdom 10495 adderpq 10867 mulerpq 10868 uzssz 12772 ltweuz 13884 wrdsymb0 14472 lsw0 14488 swrd00 14568 swrd0 14582 pfx00 14598 pfx0 14599 sumz 15645 sumss 15647 sumnul 15683 prod1 15867 prodss 15870 divsfval 17468 cidpropd 17633 lubval 18277 glbval 18290 joinval 18298 meetval 18312 gsumpropd2lem 18604 mulgfval 18999 mpfrcl 22040 iscnp2 23183 setsmstopn 24422 tngtopn 24594 dvbsss 25859 perfdvf 25860 dchrrcl 27207 nofv 27625 ltsres 27630 noseponlem 27632 noextenddif 27636 noextendlt 27637 noextendgt 27638 nolesgn2ores 27640 nogesgn1ores 27642 fvnobday 27646 nosepdmlem 27651 nosepssdm 27654 nosupbnd1lem3 27678 nosupbnd1lem5 27680 nosupbnd2lem1 27683 noinfbnd1lem3 27693 noinfbnd1lem5 27695 noinfbnd2lem1 27698 newval 27831 leftval 27845 rightval 27846 lltr 27858 madess 27862 oldssmade 27863 oldss 27866 lrold 27893 structiedg0val 29095 snstriedgval 29111 rgrx0nd 29668 vsfval 30708 dmadjrnb 31981 hmdmadj 32015 r1wf 35252 rdgprc0 35985 fullfunfv 36141 linedegen 36337 bj-inftyexpitaudisj 37410 bj-inftyexpidisj 37415 bj-fvimacnv0 37491 dibvalrel 41423 dicvalrelN 41445 dihvalrel 41539 itgocn 43406 fpwfvss 43653 r1rankcld 44472 grur1cld 44473 uz0 45656 climfveq 45913 climfveqf 45924 afv2ndeffv0 47506 fvmptrabdm 47539 fvconstr 49107 fvconstrn0 49108 fvconstr2 49109 fvconst0ci 49136 fvconstdomi 49137 ipolub00 49238 oppfrcl 49373 initopropdlemlem 49484 initopropd 49488 termopropd 49489 zeroopropd 49490 fucofvalne 49570 |
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