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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 3365 |
. 2
| |
| 3 | 1, 2 | ax-mp 7 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: elxp4 3460 tfrlem8 3925 1stval 4088 fo1st 4098 mapprc 4333 breng 4382 brdomg 4383 fundmen 4435 xpmapenlem2 4504 aceq3lem 4749 brdom3 4818 brdom5 4819 brdom4 4820 metxp 7838 bcthlem12 8014 bcthlem15 8017 bcthlem30 8032 ipfval 8355 hmoval 8473 ishoma 10694 ishomb 10695 ismona 10716 isepia 10726 isfuna 10733 idfisf 10739 |
| 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 2709 ax-pow 2749 ax-pr 2786 ax-un 2873 |
| 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-v 1815 df-dif 2053 df-un 2054 df-in 2055 df-ss 2057 df-nul 2285 df-pw 2407 df-sn 2417 df-pr 2418 df-op 2421 df-uni 2509 df-br 2626 df-opab 2673 df-cnv 3193 df-dm 3195 df-rn 3196 |