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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 5853 | . . . . 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 6827 | . . 3 ⊢ (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹‘𝐴) = ∅) | |
| 6 | 4, 5 | syl6 35 | . 2 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
| 7 | fvprc 6832 | . . 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 1542 ∃wex 1781 ∈ wcel 2114 ∃!weu 2568 Vcvv 3429 ∅c0 4273 class class class wbr 5085 dom cdm 5631 ‘cfv 6498 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2708 ax-nul 5241 ax-pr 5375 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-rab 3390 df-v 3431 df-dif 3892 df-un 3894 df-ss 3906 df-nul 4274 df-if 4467 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-br 5086 df-dm 5641 df-iota 6454 df-fv 6506 |
| This theorem is referenced by: ndmfvrcl 6873 elfvdm 6874 nfvres 6878 fvfundmfvn0 6880 0fv 6881 funfv 6927 fvun1 6931 fvco4i 6941 fvmpti 6946 mptrcl 6957 fvmptss 6960 fvmptex 6962 fvmptnf 6970 fvmptss2 6974 elfvmptrab1 6976 fvopab4ndm 6978 f0cli 7050 funiunfv 7203 funeldmb 7314 ovprc 7405 oprssdm 7548 nssdmovg 7549 ndmovg 7550 1st2val 7970 2nd2val 7971 brovpreldm 8039 soseq 8109 smofvon2 8296 rdgsucmptnf 8368 frsucmptn 8378 brwitnlem 8442 undifixp 8882 r1tr 9700 rankvaln 9723 cardidm 9883 carden2a 9890 carden2b 9891 carddomi2 9894 sdomsdomcardi 9895 pm54.43lem 9924 alephcard 9992 alephnbtwn 9993 alephgeom 10004 cfub 10171 cardcf 10174 cflecard 10175 cfle 10176 cflim2 10185 cfidm 10197 itunisuc 10341 itunitc1 10342 ituniiun 10344 alephadd 10500 alephreg 10505 pwcfsdom 10506 cfpwsdom 10507 adderpq 10879 mulerpq 10880 uzssz 12809 ltweuz 13923 wrdsymb0 14511 lsw0 14527 swrd00 14607 swrd0 14621 pfx00 14637 pfx0 14638 sumz 15684 sumss 15686 sumnul 15722 prod1 15909 prodss 15912 divsfval 17511 cidpropd 17676 lubval 18320 glbval 18333 joinval 18341 meetval 18355 gsumpropd2lem 18647 mulgfval 19045 mpfrcl 22063 iscnp2 23204 setsmstopn 24443 tngtopn 24615 dvbsss 25869 perfdvf 25870 dchrrcl 27203 nofv 27621 ltsres 27626 noseponlem 27628 noextenddif 27632 noextendlt 27633 noextendgt 27634 nolesgn2ores 27636 nogesgn1ores 27638 fvnobday 27642 nosepdmlem 27647 nosepssdm 27650 nosupbnd1lem3 27674 nosupbnd1lem5 27676 nosupbnd2lem1 27679 noinfbnd1lem3 27689 noinfbnd1lem5 27691 noinfbnd2lem1 27694 newval 27827 leftval 27841 rightval 27842 lltr 27854 madess 27858 oldssmade 27859 oldss 27862 lrold 27889 structiedg0val 29091 snstriedgval 29107 rgrx0nd 29663 vsfval 30704 dmadjrnb 31977 hmdmadj 32011 r1wf 35239 rdgprc0 35973 fullfunfv 36129 linedegen 36325 bj-inftyexpitaudisj 37519 bj-inftyexpidisj 37524 bj-fvimacnv0 37600 dibvalrel 41609 dicvalrelN 41631 dihvalrel 41725 itgocn 43592 fpwfvss 43839 r1rankcld 44658 grur1cld 44659 uz0 45840 climfveq 46097 climfveqf 46108 afv2ndeffv0 47708 fvmptrabdm 47741 fvconstr 49337 fvconstrn0 49338 fvconstr2 49339 fvconst0ci 49366 fvconstdomi 49367 ipolub00 49468 oppfrcl 49603 initopropdlemlem 49714 initopropd 49718 termopropd 49719 zeroopropd 49720 fucofvalne 49800 |
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