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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 3497 | . . . . 5 ⊢ 𝑦 ∈ V | |
2 | vex 3497 | . . . . 5 ⊢ 𝑥 ∈ V | |
3 | 1, 2 | brcnv 5752 | . . . 4 ⊢ (𝑦◡𝐴𝑥 ↔ 𝑥𝐴𝑦) |
4 | 3 | exbii 1844 | . . 3 ⊢ (∃𝑦 𝑦◡𝐴𝑥 ↔ ∃𝑦 𝑥𝐴𝑦) |
5 | 4 | abbii 2886 | . 2 ⊢ {𝑥 ∣ ∃𝑦 𝑦◡𝐴𝑥} = {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} |
6 | dfrn2 5758 | . 2 ⊢ ran ◡𝐴 = {𝑥 ∣ ∃𝑦 𝑦◡𝐴𝑥} | |
7 | df-dm 5564 | . 2 ⊢ dom 𝐴 = {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} | |
8 | 5, 6, 7 | 3eqtr4ri 2855 | 1 ⊢ dom 𝐴 = ran ◡𝐴 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1533 ∃wex 1776 {cab 2799 class class class wbr 5065 ◡ccnv 5553 dom cdm 5554 ran crn 5555 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5202 ax-nul 5209 ax-pr 5329 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-rab 3147 df-v 3496 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-sn 4567 df-pr 4569 df-op 4573 df-br 5066 df-opab 5128 df-cnv 5562 df-dm 5564 df-rn 5565 |
This theorem is referenced by: dmcnvcnv 5802 rncnvcnv 5803 rncoeq 5845 cnvimass 5948 cnvimarndm 5949 dminxp 6036 cnvsn0 6066 rnsnopg 6077 dmmpt 6093 dmco 6106 cores2 6111 cnvssrndm 6121 unidmrn 6129 dfdm2 6131 funimacnv 6434 foimacnv 6631 funcocnv2 6638 fimacnv 6838 f1opw2 7399 cnvexg 7628 tz7.48-3 8079 fopwdom 8624 sbthlem4 8629 fodomr 8667 f1opwfi 8827 zorn2lem4 9920 trclublem 14354 relexpcnv 14393 unbenlem 16243 gsumpropd2lem 17888 pjdm 20850 paste 21901 hmeores 22378 icchmeo 23544 fcnvgreu 30417 ffsrn 30464 gsummpt2co 30686 tocycfvres1 30752 tocycfvres2 30753 cycpmfvlem 30754 cycpmfv3 30757 coinfliprv 31740 itg2addnclem2 34943 rncnv 35557 lnmlmic 39686 dmnonrel 39948 cnvrcl0 39983 conrel1d 40006 |
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