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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 2581 | . . . . 5 ⊢ (∃!𝑥 𝐴𝐹𝑥 → ∃𝑥 𝐴𝐹𝑥) | |
| 2 | eldmg 5840 | . . . . 5 ⊢ (𝐴 ∈ V → (𝐴 ∈ dom 𝐹 ↔ ∃𝑥 𝐴𝐹𝑥)) | |
| 3 | 1, 2 | imbitrrid 247 | . . . 4 ⊢ (𝐴 ∈ V → (∃!𝑥 𝐴𝐹𝑥 → 𝐴 ∈ dom 𝐹)) |
| 4 | 3 | con3d 152 | . . 3 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → ¬ ∃!𝑥 𝐴𝐹𝑥)) |
| 5 | tz6.12-2 6814 | . . 3 ⊢ (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹‘𝐴) = ∅) | |
| 6 | 4, 5 | syl6 35 | . 2 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
| 7 | fvprc 6819 | . . 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 1547 ∃wex 1786 ∈ wcel 2119 ∃!weu 2572 Vcvv 3431 ∅c0 4261 class class class wbr 5072 dom cdm 5618 ‘cfv 6485 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2711 ax-nul 5228 ax-pr 5362 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-ne 2935 df-rab 3392 df-v 3433 df-dif 3886 df-un 3888 df-ss 3900 df-nul 4262 df-if 4455 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-br 5073 df-dm 5628 df-iota 6441 df-fv 6493 |
| This theorem is referenced by: ndmfvrcl 6860 elfvdm 6861 nfvres 6865 fvfundmfvn0 6867 0fv 6868 funfv 6914 fvun1 6918 fvco4i 6929 fvmpti 6934 mptrcl 6945 fvmptss 6948 fvmptex 6950 fvmptnf 6958 fvmptss2 6962 elfvmptrab1 6964 fvopab4ndm 6966 f0cli 7039 funiunfv 7192 funeldmb 7303 ovprc 7394 oprssdm 7537 nssdmovg 7538 ndmovg 7539 1st2val 7959 2nd2val 7960 brovpreldm 8028 soseq 8099 smofvon2 8286 rdgsucmptnf 8358 frsucmptn 8368 brwitnlem 8432 undifixp 8872 r1tr 9691 rankvaln 9714 cardidm 9874 carden2a 9881 carden2b 9882 carddomi2 9885 sdomsdomcardi 9886 pm54.43lem 9915 alephcard 9983 alephnbtwn 9984 alephgeom 9995 cfub 10162 cardcf 10165 cflecard 10166 cfle 10167 cflim2 10176 cfidm 10188 itunisuc 10332 itunitc1 10333 ituniiun 10335 alephadd 10491 alephreg 10496 pwcfsdom 10497 cfpwsdom 10498 adderpq 10870 mulerpq 10871 uzssz 12800 ltweuz 13914 wrdsymb0 14502 lsw0 14518 swrd00 14598 swrd0 14612 pfx00 14628 pfx0 14629 sumz 15675 sumss 15677 sumnul 15713 prod1 15900 prodss 15903 divsfval 17502 cidpropd 17667 lubval 18311 glbval 18324 joinval 18332 meetval 18346 gsumpropd2lem 18638 mulgfval 19036 mpfrcl 22061 iscnp2 23222 setsmstopn 24461 tngtopn 24633 dvbsss 25887 perfdvf 25888 dchrrcl 27221 nofv 27639 ltsres 27644 noseponlem 27646 noextenddif 27650 noextendlt 27651 noextendgt 27652 nolesgn2ores 27654 nogesgn1ores 27656 fvnobday 27660 nosepdmlem 27665 nosepssdm 27668 nosupbnd1lem3 27692 nosupbnd1lem5 27694 nosupbnd2lem1 27697 noinfbnd1lem3 27707 noinfbnd1lem5 27709 noinfbnd2lem1 27712 newval 27845 leftval 27859 rightval 27860 lltr 27872 madess 27876 oldssmade 27877 oldss 27880 lrold 27907 structiedg0val 29109 snstriedgval 29125 rgrx0nd 29681 vsfval 30722 dmadjrnb 31995 hmdmadj 32029 r1wf 35277 rdgprc0 36019 fullfunfv 36175 linedegen 36371 bj-inftyexpitaudisj 37565 bj-inftyexpidisj 37570 bj-fvimacnv0 37646 dibvalrel 41655 dicvalrelN 41677 dihvalrel 41771 itgocn 43609 fpwfvss 43856 r1rankcld 44675 grur1cld 44676 uz0 45855 climfveq 46112 climfveqf 46123 afv2ndeffv0 47723 fvmptrabdm 47756 fvconstr 49352 fvconstrn0 49353 fvconstr2 49354 fvconst0ci 49381 fvconstdomi 49382 ipolub00 49483 oppfrcl 49618 initopropdlemlem 49729 initopropd 49733 termopropd 49734 zeroopropd 49735 fucofvalne 49815 |
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