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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 3458 | . . . . 5 ⊢ 𝑦 ∈ V | |
| 2 | vex 3458 | . . . . 5 ⊢ 𝑥 ∈ V | |
| 3 | 1, 2 | brcnv 5872 | . . . 4 ⊢ (𝑦◡𝐴𝑥 ↔ 𝑥𝐴𝑦) |
| 4 | 3 | exbii 1881 | . . 3 ⊢ (∃𝑦 𝑦◡𝐴𝑥 ↔ ∃𝑦 𝑥𝐴𝑦) |
| 5 | 4 | abbii 2830 | . 2 ⊢ {𝑥 ∣ ∃𝑦 𝑦◡𝐴𝑥} = {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} |
| 6 | dfrn2 5882 | . 2 ⊢ ran ◡𝐴 = {𝑥 ∣ ∃𝑦 𝑦◡𝐴𝑥} | |
| 7 | df-dm 5668 | . 2 ⊢ dom 𝐴 = {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} | |
| 8 | 5, 6, 7 | 3eqtr4ri 2797 | 1 ⊢ dom 𝐴 = ran ◡𝐴 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 ∃wex 1812 {cab 2741 class class class wbr 5108 ◡ccnv 5657 dom cdm 5658 ran crn 5659 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-sep 5255 ax-pr 5398 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4841 df-br 5109 df-opab 5174 df-cnv 5666 df-dm 5668 df-rn 5669 |
| This theorem is used by: dmcnvcnv 5927 rncnvcnv 5928 dmcocnv2 5976 rncoeq 5977 rncocnv2 5978 rncocnv1 5979 cnvimassrndm 6097 cnvimarndmOLD 6099 dminxp 6190 cnvimass 6217 cnvsn0 6230 rnsnopg 6241 dmmpt 6260 dmco 6275 cores2 6280 cnvssrndm 6297 unidmrn 6306 funimacnv 6651 foimacnv 6872 funcocnv2OLD 6881 f1opw2 7708 cnvexg 7970 tz7.48-3 8492 fopwdom 9142 sbthlem4 9147 fodomr 9185 cnvfi 9229 fodomfir 9357 f1opwfi 9383 zorn2lem4 10616 trclublem 15191 relexpcnv 15231 unbenlem 17130 gsumpropd2lem 18918 pjdm 22068 paste 23667 hmeores 24145 icchmeo 25317 fcnvgreu 33364 ffsrn 33416 gsummpt2co 33708 tocycfvres1 33770 tocycfvres2 33771 cycpmfvlem 33772 cycpmfv3 33775 coinfliprv 35226 j0ltalephlem 36048 cossidres2 38221 nvo3 38230 itg2addnclem2 38858 rncnv 39504 lnmlmic 44356 dmnonrel 44851 cnvrcl0 44886 conrel1d 44924 cocanss1 46185 |
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