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| Description: The value of a class outside its domain is the empty set. |
| Ref | Expression |
|---|---|
| ndmfv |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 1957 |
. . . . . 6
| |
| 2 | breq1 3341 |
. . . . . . 7
| |
| 3 | 2 | exbidv 1657 |
. . . . . 6
|
| 4 | visset 2295 |
. . . . . . 7
| |
| 5 | 4 | eldm 4153 |
. . . . . 6
|
| 6 | 1, 3, 5 | vtoclbg 2347 |
. . . . 5
|
| 7 | euex 1788 |
. . . . 5
| |
| 8 | 6, 7 | syl5bir 227 |
. . . 4
|
| 9 | 8 | con3d 111 |
. . 3
|
| 10 | tz6.12-2 4696 |
. . 3
| |
| 11 | 9, 10 | syl6 25 |
. 2
|
| 12 | fvprc 4678 |
. . 3
| |
| 13 | 12 | a1d 15 |
. 2
|
| 14 | 11, 13 | pm2.61i 140 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: ndmfvrcl 4703 elfvdm 4704 nfvres 4705 nfunsnOLD 4707 funfv 4731 fvco 4736 fvopab4ndm 4747 funiunfv 4842 oprprc1 4908 oprssdm 4975 ndmoprg 4976 1st2val 5038 2nd2val 5039 rdgsucopabn 5155 r1tr 5765 alephon 5876 alephcard 6015 alephnbtwn 6016 alephgeom 6030 cfub 6056 cardcf 6059 cflecard 6060 cfle 6061 uzssz 7599 alephadd 8851 issubg 9425 vsfval 9586 dmadjrnb 11467 hmdmadj 11501 fvrn0 13837 frsucopabn 13911 soseq 13955 nofv 13998 bdayelon 14017 axdenselem2 14020 axfelem12 14042 fvsnn 14450 unprj 14511 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1304 ax-gen 1305 ax-8 1306 ax-9 1307 ax-10 1308 ax-11 1309 ax-12 1310 ax-14 1312 ax-17 1317 ax-4 1319 ax-5o 1321 ax-6o 1324 ax-9o 1481 ax-10o 1500 ax-16 1580 ax-11o 1588 ax-ext 1865 ax-sep 3438 ax-nul 3445 ax-pow 3481 ax-pr 3524 |
| This theorem depends on definitions: df-bi 164 df-or 241 df-an 242 df-ex 1327 df-sb 1536 df-eu 1775 df-mo 1776 df-clab 1872 df-cleq 1877 df-clel 1880 df-ne 2019 df-ral 2109 df-rex 2110 df-v 2294 df-dif 2597 df-un 2600 df-in 2603 df-ss 2605 df-nul 2876 df-pw 3035 df-sn 3049 df-pr 3050 df-op 3053 df-uni 3178 df-br 3339 df-opab 3396 df-xp 4000 df-cnv 4002 df-dm 4004 df-rn 4005 df-res 4006 df-ima 4007 df-fv 4014 |