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Related theorems GIF version |
| Description: Alternate definition of domain. |
| Ref | Expression |
|---|---|
| dfdm4 | ⊢ dom A = ran ◡A |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | visset 1350 | . . . . 5 ⊢ y ∈ V | |
| 2 | visset 1350 | . . . . 5 ⊢ x ∈ V | |
| 3 | 1, 2 | brcnv 2519 | . . . 4 ⊢ (y◡Ax ↔ xAy) |
| 4 | 3 | biex 733 | . . 3 ⊢ (∃y y◡Ax ↔ ∃y xAy) |
| 5 | 4 | biabi 1181 | . 2 ⊢ {x∣∃y y◡Ax} = {x∣∃y xAy} |
| 6 | dfrn2 2523 | . 2 ⊢ ran ◡A = {x∣∃y y◡Ax} | |
| 7 | df-dm 2428 | . 2 ⊢ dom A = {x∣∃y xAy} | |
| 8 | 5, 6, 7 | 3eqtr4r 1127 | 1 ⊢ dom A = ran ◡A |
| Colors of variables: wff set class |
| Syntax hints: ∃wex 678 {cab 1090 = wceq 1091 class class class wbr 2054 ◡ccnv 2409 dom cdm 2410 ran crn 2411 |
| This theorem is referenced by: hbdm 2565 rncoeq 2574 cnvexg 2669 funimacnv 2711 f1cnv 2782 f1ocnv 2811 tz7.48-3 2996 pw2en 3348 sbthlem4 3352 inf3lem7 3470 zornlem4 3606 fodom 3613 fodomb 3615 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-br 2063 df-opab 2098 df-cnv 2426 df-dm 2428 df-rn 2429 |