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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 2603 | . . . . 5 ⊢ (∃!𝑥 𝐴𝐹𝑥 → ∃𝑥 𝐴𝐹𝑥) | |
| 2 | eldmg 5870 | . . . . 5 ⊢ (𝐴 ∈ V → (𝐴 ∈ dom 𝐹 ↔ ∃𝑥 𝐴𝐹𝑥)) | |
| 3 | 1, 2 | imbitrrid 248 | . . . 4 ⊢ (𝐴 ∈ V → (∃!𝑥 𝐴𝐹𝑥 → 𝐴 ∈ dom 𝐹)) |
| 4 | 3 | con3d 152 | . . 3 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → ¬ ∃!𝑥 𝐴𝐹𝑥)) |
| 5 | tz6.12-2 6849 | . . 3 ⊢ (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹‘𝐴) = ∅) | |
| 6 | 4, 5 | syl6 35 | . 2 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
| 7 | fvprc 6854 | . . 3 ⊢ (¬ 𝐴 ∈ V → (𝐹‘𝐴) = ∅) | |
| 8 | 7 | a1d 25 | . 2 ⊢ (¬ 𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
| 9 | 6, 8 | pm2.61i 183 | 1 ⊢ (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1559 ∃wex 1798 ∈ wcel 2141 ∃!weu 2594 Vcvv 3453 ∅c0 4283 class class class wbr 5097 dom cdm 5643 ‘cfv 6516 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-ext 2733 ax-nul 5253 ax-pr 5387 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-rab 3414 df-v 3455 df-dif 3905 df-un 3907 df-ss 3919 df-nul 4284 df-if 4478 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-br 5098 df-dm 5653 df-iota 6472 df-fv 6524 |
| This theorem is referenced by: ndmfvrcl 6895 elfvdm 6896 nfvres 6900 fvfundmfvn0 6902 0fv 6903 funfv 6949 fvun1 6953 fvco4i 6964 fvmpti 6969 mptrcl 6980 fvmptss 6983 fvmptex 6985 fvmptnf 6993 fvmptss2 6997 elfvmptrab1 6999 fvopab4ndm 7001 f0cli 7074 funiunfv 7227 funeldmb 7338 ovprc 7429 oprssdm 7572 nssdmovg 7573 ndmovg 7574 1st2val 7993 2nd2val 7994 brovpreldm 8062 soseq 8133 smofvon2 8321 rdgsucmptnf 8394 frsucmptn 8404 brwitnlem 8470 undifixp 8910 r1tr 9728 rankvaln 9751 cardidm 9911 carden2a 9918 carden2b 9919 carddomi2 9922 sdomsdomcardi 9923 pm54.43lem 9952 alephcard 10020 alephnbtwn 10021 alephgeom 10032 cfub 10199 cardcf 10202 cflecard 10203 cfle 10204 cflim2 10214 cfidm 10226 itunisuc 10370 itunitc1 10371 ituniiun 10373 alephadd 10529 alephreg 10534 pwcfsdom 10535 cfpwsdom 10536 adderpq 10908 mulerpq 10909 uzssz 12854 ltweuz 13968 wrdsymb0 14556 lsw0 14572 swrd00 14652 swrd0 14666 pfx00 14682 pfx0 14683 sumz 15740 sumss 15742 sumnul 15778 prod1 15965 prodss 15968 divsfval 17568 cidpropd 17733 lubval 18377 glbval 18390 joinval 18398 meetval 18412 gsumpropd2lem 18704 mulgfval 19102 mpfrcl 22126 iscnp2 23287 setsmstopn 24526 tngtopn 24698 dvbsss 25952 perfdvf 25953 dchrrcl 27292 nofv 27709 ltsres 27714 noseponlem 27716 noextenddif 27720 noextendlt 27721 noextendgt 27722 nolesgn2ores 27724 nogesgn1ores 27726 fvnobday 27730 nosepdmlem 27735 nosepssdm 27738 nosupbnd1lem3 27762 nosupbnd1lem5 27764 nosupbnd2lem1 27767 noinfbnd1lem3 27777 noinfbnd1lem5 27779 noinfbnd2lem1 27782 newval 27916 leftval 27930 rightval 27931 lltr 27943 madess 27947 oldssmade 27948 oldss 27951 lrold 27978 structiedg0val 29180 snstriedgval 29196 rgrx0nd 29752 vsfval 30793 dmadjrnb 32066 hmdmadj 32100 r1wf 35353 rdgprc0 36102 fullfunfv 36258 linedegen 36454 bj-inftyexpitaudisj 37658 bj-inftyexpidisj 37663 bj-fvimacnv0 37739 dibvalrel 41748 dicvalrelN 41770 dihvalrel 41864 itgocn 43702 fpwfvss 43949 r1rankcld 44768 grur1cld 44769 uz0 45947 climfveq 46204 climfveqf 46215 afv2ndeffv0 47815 fvmptrabdm 47848 fvconstr 49444 fvconstrn0 49445 fvconstr2 49446 fvconst0ci 49473 fvconstdomi 49474 ipolub00 49575 oppfrcl 49710 initopropdlemlem 49821 initopropd 49825 termopropd 49826 zeroopropd 49827 fucofvalne 49907 |
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