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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 2572 | . . . . 5 ⊢ (∃!𝑥 𝐴𝐹𝑥 → ∃𝑥 𝐴𝐹𝑥) | |
2 | eldmg 5897 | . . . . 5 ⊢ (𝐴 ∈ V → (𝐴 ∈ dom 𝐹 ↔ ∃𝑥 𝐴𝐹𝑥)) | |
3 | 1, 2 | imbitrrid 245 | . . . 4 ⊢ (𝐴 ∈ V → (∃!𝑥 𝐴𝐹𝑥 → 𝐴 ∈ dom 𝐹)) |
4 | 3 | con3d 152 | . . 3 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → ¬ ∃!𝑥 𝐴𝐹𝑥)) |
5 | tz6.12-2 6877 | . . 3 ⊢ (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹‘𝐴) = ∅) | |
6 | 4, 5 | syl6 35 | . 2 ⊢ (𝐴 ∈ V → (¬ 𝐴 ∈ dom 𝐹 → (𝐹‘𝐴) = ∅)) |
7 | fvprc 6881 | . . 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 1782 ∈ wcel 2107 ∃!weu 2563 Vcvv 3475 ∅c0 4322 class class class wbr 5148 dom cdm 5676 ‘cfv 6541 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-nul 5306 ax-pr 5427 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-ral 3063 df-rex 3072 df-rab 3434 df-v 3477 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-nul 4323 df-if 4529 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-br 5149 df-dm 5686 df-iota 6493 df-fv 6549 |
This theorem is referenced by: ndmfvrcl 6925 elfvdm 6926 nfvres 6930 fvfundmfvn0 6932 0fv 6933 funfv 6976 fvun1 6980 fvco4i 6990 fvmpti 6995 mptrcl 7005 fvmptss 7008 fvmptex 7010 fvmptnf 7018 fvmptss2 7021 elfvmptrab1 7023 fvopab4ndm 7025 f0cli 7097 funiunfv 7244 funeldmb 7353 ovprc 7444 oprssdm 7585 nssdmovg 7586 ndmovg 7587 1st2val 8000 2nd2val 8001 brovpreldm 8072 soseq 8142 smofvon2 8353 rdgsucmptnf 8426 frsucmptn 8436 brwitnlem 8504 undifixp 8925 r1tr 9768 rankvaln 9791 cardidm 9951 carden2a 9958 carden2b 9959 carddomi2 9962 sdomsdomcardi 9963 pm54.43lem 9992 alephcard 10062 alephnbtwn 10063 alephgeom 10074 cfub 10241 cardcf 10244 cflecard 10245 cfle 10246 cflim2 10255 cfidm 10267 itunisuc 10411 itunitc1 10412 ituniiun 10414 alephadd 10569 alephreg 10574 pwcfsdom 10575 cfpwsdom 10576 adderpq 10948 mulerpq 10949 uzssz 12840 ltweuz 13923 wrdsymb0 14496 lsw0 14512 swrd00 14591 swrd0 14605 pfx00 14621 pfx0 14622 sumz 15665 sumss 15667 sumnul 15703 prod1 15885 prodss 15888 divsfval 17490 cidpropd 17651 lubval 18306 glbval 18319 joinval 18327 meetval 18341 gsumpropd2lem 18595 mulgfval 18947 mpfrcl 21640 iscnp2 22735 setsmstopn 23978 tngtopn 24159 dvbsss 25411 perfdvf 25412 dchrrcl 26733 nofv 27150 sltres 27155 noseponlem 27157 noextenddif 27161 noextendlt 27162 noextendgt 27163 nolesgn2ores 27165 nogesgn1ores 27167 fvnobday 27171 nosepdmlem 27176 nosepssdm 27179 nosupbnd1lem3 27203 nosupbnd1lem5 27205 nosupbnd2lem1 27208 noinfbnd1lem3 27218 noinfbnd1lem5 27220 noinfbnd2lem1 27223 newval 27340 leftval 27348 rightval 27349 lltropt 27357 madess 27361 oldssmade 27362 lrold 27381 structiedg0val 28272 snstriedgval 28288 rgrx0nd 28841 vsfval 29874 dmadjrnb 31147 hmdmadj 31181 rdgprc0 34754 fullfunfv 34908 linedegen 35104 bj-inftyexpitaudisj 36075 bj-inftyexpidisj 36080 bj-fvimacnv0 36156 dibvalrel 40023 dicvalrelN 40045 dihvalrel 40139 itgocn 41892 fpwfvss 42149 r1rankcld 42976 grur1cld 42977 uz0 44109 climfveq 44372 climfveqf 44383 afv2ndeffv0 45955 fvmptrabdm 45988 fvconstr 47476 fvconstrn0 47477 fvconstr2 47478 fvconst0ci 47479 fvconstdomi 47480 ipolub00 47572 |
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