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| Description: The domain of a set is a set. Corollary 6.8(2) of [TakeutiZaring] p. 26. |
| Ref | Expression |
|---|---|
| dmex.1 |
|
| Ref | Expression |
|---|---|
| dmex |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dmex.1 |
. 2
| |
| 2 | dmexg 3358 |
. 2
| |
| 3 | 1, 2 | ax-mp 7 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: elxp4 3453 tfrlem8 3918 1stval 4081 fo1st 4091 mapprc 4326 breng 4375 brdomg 4376 fundmen 4428 xpmapenlem2 4497 aceq3lem 4732 brdom3 4801 brdom5 4802 brdom4 4803 metxp 7834 bcthlem12 8010 bcthlem15 8013 bcthlem30 8028 ipfval 8352 hmoval 8470 ishoma 10715 ishomb 10716 ismona 10737 isepia 10747 isfuna 10754 idfisf 10760 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-10 966 ax-11 967 ax-12 968 ax-13 969 ax-14 970 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2703 ax-pow 2742 ax-pr 2779 ax-un 2866 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 981 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1587 df-v 1812 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-pw 2402 df-sn 2412 df-pr 2413 df-op 2416 df-uni 2504 df-br 2620 df-opab 2667 df-cnv 3186 df-dm 3188 df-rn 3189 |