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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 1537 |
. . . . . 6
| |
| 2 | breq1 2627 |
. . . . . . 7
| |
| 3 | 2 | exbidv 1281 |
. . . . . 6
|
| 4 | visset 1816 |
. . . . . . 7
| |
| 5 | 4 | eldm 3313 |
. . . . . 6
|
| 6 | 1, 3, 5 | vtoclbg 1851 |
. . . . 5
|
| 7 | euex 1396 |
. . . . 5
| |
| 8 | 6, 7 | syl5bir 210 |
. . . 4
|
| 9 | 8 | con3d 95 |
. . 3
|
| 10 | tz6.12-2 3745 |
. . 3
| |
| 11 | 9, 10 | syl6 22 |
. 2
|
| 12 | fvprc 3727 |
. . 3
| |
| 13 | 12 | a1d 12 |
. 2
|
| 14 | 11, 13 | pm2.61i 126 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: ndmfvrcl 3752 elfvdm 3753 nfvres 3754 funfv 3776 fvco 3780 fvopab4ndm 3790 funiunfv 3872 rdgsucopabn 3953 oprprc1 3990 oprssdm 4048 ndmoprg 4049 1st2val 4101 2nd2val 4102 r1tr 4664 alephon 4876 alephcard 4878 alephnbtwn 4879 alephgeom 4893 cfub 4920 cardcf 4923 cflecard 4924 cfle 4925 uzssz 6431 alephadd 7584 issubg 8112 0vfval 8221 vsfval 8250 dmadjrnb 9825 hmdmadjt 9859 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-sep 2708 ax-pow 2748 ax-pr 2785 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-ral 1652 df-rex 1653 df-v 1815 df-dif 2052 df-un 2053 df-in 2054 df-ss 2056 df-nul 2284 df-pw 2406 df-sn 2416 df-pr 2417 df-op 2420 df-uni 2508 df-br 2625 df-opab 2672 df-xp 3190 df-cnv 3192 df-dm 3194 df-rn 3195 df-res 3196 df-ima 3197 df-fv 3204 |