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Mirrors > Home > MPE Home > Th. List > dfdm4 | Structured version Visualization version GIF version |
Description: Alternate definition of domain. (Contributed by NM, 28-Dec-1996.) |
Ref | Expression |
---|---|
dfdm4 | ⊢ dom 𝐴 = ran ◡𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vex 3444 | . . . . 5 ⊢ 𝑦 ∈ V | |
2 | vex 3444 | . . . . 5 ⊢ 𝑥 ∈ V | |
3 | 1, 2 | brcnv 5717 | . . . 4 ⊢ (𝑦◡𝐴𝑥 ↔ 𝑥𝐴𝑦) |
4 | 3 | exbii 1849 | . . 3 ⊢ (∃𝑦 𝑦◡𝐴𝑥 ↔ ∃𝑦 𝑥𝐴𝑦) |
5 | 4 | abbii 2863 | . 2 ⊢ {𝑥 ∣ ∃𝑦 𝑦◡𝐴𝑥} = {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} |
6 | dfrn2 5723 | . 2 ⊢ ran ◡𝐴 = {𝑥 ∣ ∃𝑦 𝑦◡𝐴𝑥} | |
7 | df-dm 5529 | . 2 ⊢ dom 𝐴 = {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} | |
8 | 5, 6, 7 | 3eqtr4ri 2832 | 1 ⊢ dom 𝐴 = ran ◡𝐴 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1538 ∃wex 1781 {cab 2776 class class class wbr 5030 ◡ccnv 5518 dom cdm 5519 ran crn 5520 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-v 3443 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-br 5031 df-opab 5093 df-cnv 5527 df-dm 5529 df-rn 5530 |
This theorem is referenced by: dmcnvcnv 5767 rncnvcnv 5768 rncoeq 5811 cnvimass 5916 cnvimarndm 5917 dminxp 6004 cnvsn0 6034 rnsnopg 6045 dmmpt 6061 dmco 6074 cores2 6079 cnvssrndm 6090 unidmrn 6098 dfdm2 6100 funimacnv 6405 foimacnv 6607 funcocnv2 6614 fimacnv 6816 f1opw2 7380 cnvexg 7611 tz7.48-3 8063 fopwdom 8608 sbthlem4 8614 fodomr 8652 f1opwfi 8812 zorn2lem4 9910 trclublem 14346 relexpcnv 14386 unbenlem 16234 gsumpropd2lem 17881 pjdm 20396 paste 21899 hmeores 22376 icchmeo 23546 fcnvgreu 30436 ffsrn 30491 gsummpt2co 30733 tocycfvres1 30802 tocycfvres2 30803 cycpmfvlem 30804 cycpmfv3 30807 coinfliprv 31850 itg2addnclem2 35109 rncnv 35718 lnmlmic 40032 dmnonrel 40290 cnvrcl0 40325 conrel1d 40364 |
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