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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 2605 | . . . . 5 ⊢ (∃!𝑥 𝐴𝐹𝑥 → ∃𝑥 𝐴𝐹𝑥) | |
| 2 | eldmg 5890 | . . . . 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 6870 | . . 3 ⊢ (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹‘𝐴) = ∅) | |
| 6 | 4, 5 | syl6 36 | . 2 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
| 7 | fvprc 6875 | . . 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 1570 ∃wex 1809 ∈ wcel 2143 ∃!weu 2596 Vcvv 3455 ∅c0 4287 class class class wbr 5110 dom cdm 5663 ‘cfv 6538 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 ax-nul 5270 ax-pr 5406 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-ne 2959 df-rab 3417 df-v 3457 df-dif 3909 df-un 3911 df-ss 3923 df-nul 4288 df-if 4489 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4874 df-br 5111 df-dm 5673 df-iota 6494 df-fv 6546 |
| This theorem is referenced by: ndmfvrcl 6916 elfvdm 6917 nfvres 6921 fvfundmfvn0 6923 0fv 6924 funfv 6970 fvun1 6974 fvco4i 6985 fvmpti 6990 mptrcl 7001 fvmptss 7004 fvmptex 7006 fvmptnf 7014 fvmptss2 7018 elfvmptrab1 7020 fvopab4ndm 7022 f0cli 7095 funiunfv 7248 funeldmb 7359 ovprc 7450 oprssdm 7593 nssdmovg 7594 ndmovg 7595 1st2val 8015 2nd2val 8016 brovpreldm 8085 soseq 8156 smofvon2 8344 rdgsucmptnf 8417 frsucmptn 8427 brwitnlem 8493 undifixp 8933 r1tr 9749 rankvaln 9772 cardidm 9946 carden2a 9953 carden2b 9954 carddomi2 9957 sdomsdomcardi 9958 pm54.43lem 9987 alephcard 10055 alephnbtwn 10056 alephgeom 10067 cfub 10233 cardcf 10236 cflecard 10237 cfle 10238 cflim2 10248 cfidm 10260 itunisuc 10404 itunitc1 10405 ituniiun 10407 alephadd 10563 alephreg 10568 pwcfsdom 10569 cfpwsdom 10570 adderpq 10942 mulerpq 10943 uzssz 12884 ltweuz 13999 wrdsymb0 14588 lsw0 14604 swrd00 14684 swrd0 14698 pfx00 14714 pfx0 14715 sumz 15775 sumss 15777 sumnul 15813 prod1 16000 prodss 16003 divsfval 17602 cidpropd 17767 lubval 18411 glbval 18424 joinval 18432 meetval 18446 gsumpropd2lem 18738 mulgfval 19136 mpfrcl 22217 iscnp2 23377 setsmstopn 24616 tngtopn 24788 dvbsss 26042 perfdvf 26043 dchrrcl 27385 nofv 27802 ltsres 27807 noseponlem 27809 noextenddif 27813 noextendlt 27814 noextendgt 27815 nolesgn2ores 27817 nogesgn1ores 27819 fvnobday 27823 nosepdmlem 27828 nosepssdm 27831 nosupbnd1lem3 27855 nosupbnd1lem5 27857 nosupbnd2lem1 27860 noinfbnd1lem3 27870 noinfbnd1lem5 27872 noinfbnd2lem1 27875 newval 28009 leftval 28023 rightval 28024 lltr 28036 madess 28040 oldssmade 28041 oldss 28044 lrold 28071 structiedg0val 29353 snstriedgval 29369 rgrx0nd 29925 vsfval 30966 dmadjrnb 32239 hmdmadj 32273 r1wf 35470 rdgprc0 36264 fullfunfv 36420 linedegen 36616 bj-inftyexpitaudisj 37830 bj-inftyexpidisj 37835 bj-fvimacnv0 37911 dibvalrel 41918 dicvalrelN 41940 dihvalrel 42034 itgocn 43874 fpwfvss 44121 r1rankcld 44938 grur1cld 44939 uz0 46109 climfveq 46366 climfveqf 46377 afv2ndeffv0 47980 fvmptrabdm 48013 fvconstr 49623 fvconstrn0 49624 fvconstr2 49625 fvconst0ci 49652 fvconstdomi 49653 ipolub00 49754 oppfrcl 49889 initopropdlemlem 50000 initopropd 50004 termopropd 50005 zeroopropd 50006 fucofvalne 50086 |
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