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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 3499 | . . . . 5 ⊢ 𝑦 ∈ V | |
2 | vex 3499 | . . . . 5 ⊢ 𝑥 ∈ V | |
3 | 1, 2 | brcnv 5755 | . . . 4 ⊢ (𝑦◡𝐴𝑥 ↔ 𝑥𝐴𝑦) |
4 | 3 | exbii 1848 | . . 3 ⊢ (∃𝑦 𝑦◡𝐴𝑥 ↔ ∃𝑦 𝑥𝐴𝑦) |
5 | 4 | abbii 2888 | . 2 ⊢ {𝑥 ∣ ∃𝑦 𝑦◡𝐴𝑥} = {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} |
6 | dfrn2 5761 | . 2 ⊢ ran ◡𝐴 = {𝑥 ∣ ∃𝑦 𝑦◡𝐴𝑥} | |
7 | df-dm 5567 | . 2 ⊢ dom 𝐴 = {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} | |
8 | 5, 6, 7 | 3eqtr4ri 2857 | 1 ⊢ dom 𝐴 = ran ◡𝐴 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 ∃wex 1780 {cab 2801 class class class wbr 5068 ◡ccnv 5556 dom cdm 5557 ran crn 5558 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pr 5332 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-rab 3149 df-v 3498 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-sn 4570 df-pr 4572 df-op 4576 df-br 5069 df-opab 5131 df-cnv 5565 df-dm 5567 df-rn 5568 |
This theorem is referenced by: dmcnvcnv 5805 rncnvcnv 5806 rncoeq 5848 cnvimass 5951 cnvimarndm 5952 dminxp 6039 cnvsn0 6069 rnsnopg 6080 dmmpt 6096 dmco 6109 cores2 6114 cnvssrndm 6124 unidmrn 6132 dfdm2 6134 funimacnv 6437 foimacnv 6634 funcocnv2 6641 fimacnv 6841 f1opw2 7402 cnvexg 7631 tz7.48-3 8082 fopwdom 8627 sbthlem4 8632 fodomr 8670 f1opwfi 8830 zorn2lem4 9923 trclublem 14357 relexpcnv 14396 unbenlem 16246 gsumpropd2lem 17891 pjdm 20853 paste 21904 hmeores 22381 icchmeo 23547 fcnvgreu 30420 ffsrn 30467 gsummpt2co 30688 tocycfvres1 30754 tocycfvres2 30755 cycpmfvlem 30756 cycpmfv3 30759 coinfliprv 31742 itg2addnclem2 34946 rncnv 35560 lnmlmic 39695 dmnonrel 39957 cnvrcl0 39992 conrel1d 40015 |
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