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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 5880 | . . . . 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 |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 = wceq 1570 ∃wex 1812 ∈ wcel 2145 ∃!weu 2594 Vcvv 3451 ∅c0 4279 class class class wbr 5103 dom cdm 5651 ‘cfv 6537 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 ax-nul 5260 ax-pr 5391 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-dm 5661 df-iota 6493 df-fv 6545 |
| This theorem is used 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 7096 fvtp0 7204 funiunfv 7250 funeldmb 7367 ovprc 7456 oprssdm 7600 nssdmovg 7601 ndmovg 7602 1st2val 8027 2nd2val 8028 brovpreldm 8098 soseq 8169 smofvon2 8357 rdgsucmptnf 8430 frsucmptn 8440 brwitnlem 8508 undifixp 8955 r1tr 9776 rankvaln 9800 r1wf 9834 cardidm 10033 carden2a 10040 carden2b 10041 carddomi2 10044 sdomsdomcardi 10045 pm54.43lem 10074 alephcard 10142 alephnbtwn 10143 alephgeom 10154 cfub 10319 cardcf 10322 cflecard 10323 cfle 10324 cflim2 10334 cfidm 10346 itunisuc 10490 itunitc1 10491 ituniiun 10493 alephadd 10655 alephreg 10660 pwcfsdom 10661 cfpwsdom 10662 adderpq 11034 mulerpq 11035 uzssz 12979 ltweuz 14097 wrdsymb0 14687 lsw0 14703 swrd00 14785 swrd0 14801 pfx00 14817 pfx0 14818 sumz 15881 sumss 15883 sumnul 15919 prod1 16104 prodss 16107 divsfval 17712 cidpropd 17877 lubval 18521 glbval 18534 joinval 18542 meetval 18556 gsumpropd2lem 18861 mulgfval 19272 mpfrcl 22387 iscnp2 23550 setsmstopn 24790 tngtopn 24962 dvbsss 26215 perfdvf 26216 dchrrcl 27560 nofv 28007 ltsres 28012 noseponlem 28014 noextenddif 28018 noextendlt 28019 noextendgt 28020 nolesgn2ores 28022 nogesgn1ores 28024 fvnobday 28028 nosepdmlem 28033 nosepssdm 28036 nosupbnd1lem3 28060 nosupbnd1lem5 28062 nosupbnd2lem1 28065 noinfbnd1lem3 28075 noinfbnd1lem5 28077 noinfbnd2lem1 28080 newval 28214 leftval 28228 rightval 28229 lltr 28241 madess 28245 oldssmade 28246 oldss 28249 lrold 28276 structiedg0val 29593 snstriedgval 29609 rgrx0nd 30168 vsfval 31228 dmadjrnb 32501 hmdmadj 32535 rdgprc0 36535 fullfunfv 36691 linedegen 36888 bj-inftyexpitaudisj 38106 bj-inftyexpidisj 38111 bj-fvimacnv0 38187 dibvalrel 42200 dicvalrelN 42222 dihvalrel 42316 itgocn 44150 fpwfvss 44397 r1rankcld 45214 grur1cld 45215 uz0 46391 climfveq 46648 climfveqf 46659 afv2ndeffv0 48299 fvmptrabdm 48332 ovconstbrd 49941 ovconstbrn0d 49942 elovconstbrd 49943 fvconst0ci 49968 fvconstdomi 49969 ipolub00 50070 oppfrcl 50205 initopropdlemlem 50316 initopropd 50320 termopropd 50321 zeroopropd 50322 fucofvalne 50402 |
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