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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 1510 |
. . . . . 6
| |
| 2 | breq1 2590 |
. . . . . . 7
| |
| 3 | 2 | exbidv 1261 |
. . . . . 6
|
| 4 | visset 1788 |
. . . . . . 7
| |
| 5 | 4 | eldm 3264 |
. . . . . 6
|
| 6 | 1, 3, 5 | vtoclbg 1823 |
. . . . 5
|
| 7 | euex 1371 |
. . . . 5
| |
| 8 | 6, 7 | syl5bir 210 |
. . . 4
|
| 9 | 8 | con3d 95 |
. . 3
|
| 10 | tz6.12-2 3678 |
. . 3
| |
| 11 | 9, 10 | syl6 22 |
. 2
|
| 12 | fvprc 3660 |
. . 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 3685 elfvdm 3686 nfvres 3687 funfv 3709 fvco 3713 fvopab4ndm 3723 funiunfv 3805 rdgsucopabn 3886 oprprc1 3923 oprssdm 3981 ndmoprg 3982 ndmoprgOLD 3983 1st2val 4033 2nd2val 4034 r1tr 4578 alephon 4788 alephcard 4790 alephnbtwn 4791 alephgeom 4805 cfub 4831 cardcf 4834 cflecard 4835 cfle 4836 uzssz 6313 alephadd 7475 issubg 8001 0vfval 8105 vsfval 8132 dmadjrnb 9961 hmdmadjt 9994 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-4 951 ax-5 952 ax-6 953 ax-7 954 ax-gen 955 ax-8 1101 ax-9 1102 ax-10 1103 ax-12 1104 ax-13 1107 ax-14 1108 ax-11 1180 ax-17 1190 ax-16 1194 ax-11o 1202 ax-ext 1436 ax-sep 2671 ax-nul 2678 ax-pow 2710 ax-pr 2747 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 957 df-sb 1155 df-eu 1359 df-mo 1360 df-clab 1441 df-cleq 1446 df-clel 1449 df-ne 1563 df-ral 1625 df-rex 1626 df-v 1787 df-dif 2020 df-un 2021 df-in 2022 df-ss 2024 df-nul 2252 df-pw 2373 df-sn 2383 df-pr 2384 df-op 2387 df-uni 2472 df-br 2588 df-opab 2635 df-xp 3147 df-cnv 3149 df-dm 3151 df-rn 3152 df-res 3153 df-ima 3154 df-fv 3161 |