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Related theorems GIF version |
| Description: A simpler equivalence for single-rooted (see funcnv 2703). |
| Ref | Expression |
|---|---|
| funcnv2 | ⊢ (Fun ◡A ↔ ∀y∃*x xAy) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dffunmo 2679 | . 2 ⊢ (Fun ◡A ↔ (Rel ◡A ∧ ∀y∃*x y◡Ax)) | |
| 2 | relcnv 2624 | . . . 4 ⊢ Rel ◡A | |
| 3 | 2 | biantrur 544 | . . 3 ⊢ (∀y∃*x y◡Ax ↔ (Rel ◡A ∧ ∀y∃*x y◡Ax)) |
| 4 | visset 1350 | . . . . . 6 ⊢ y ∈ V | |
| 5 | visset 1350 | . . . . . 6 ⊢ x ∈ V | |
| 6 | 4, 5 | brcnv 2519 | . . . . 5 ⊢ (y◡Ax ↔ xAy) |
| 7 | 6 | bimo 1031 | . . . 4 ⊢ (∃*x y◡Ax ↔ ∃*x xAy) |
| 8 | 7 | bial 695 | . . 3 ⊢ (∀y∃*x y◡Ax ↔ ∀y∃*x xAy) |
| 9 | 3, 8 | bitr3 153 | . 2 ⊢ ((Rel ◡A ∧ ∀y∃*x y◡Ax) ↔ ∀y∃*x xAy) |
| 10 | 1, 9 | bitr 151 | 1 ⊢ (Fun ◡A ↔ ∀y∃*x xAy) |
| Colors of variables: wff set class |
| Syntax hints: ↔ wb 127 ∧ wa 196 ∀wal 672 ∃*wmo 1008 class class class wbr 2054 ◡ccnv 2409 Rel wrel 2415 Fun wfun 2416 |
| This theorem is referenced by: funcnv 2703 fun2cnv 2704 |
| 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-eu 1009 df-mo 1010 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-id 2125 df-xp 2424 df-rel 2425 df-cnv 2426 df-co 2427 df-fun 2432 |