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Mirrors > Home > MPE Home > Th. List > funcnv2 | Structured version Visualization version GIF version |
Description: A simpler equivalence for single-rooted (see funcnv 6499). (Contributed by NM, 9-Aug-2004.) |
Ref | Expression |
---|---|
funcnv2 | ⊢ (Fun ◡𝐴 ↔ ∀𝑦∃*𝑥 𝑥𝐴𝑦) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | relcnv 6009 | . . 3 ⊢ Rel ◡𝐴 | |
2 | dffun6 6445 | . . 3 ⊢ (Fun ◡𝐴 ↔ (Rel ◡𝐴 ∧ ∀𝑦∃*𝑥 𝑦◡𝐴𝑥)) | |
3 | 1, 2 | mpbiran 705 | . 2 ⊢ (Fun ◡𝐴 ↔ ∀𝑦∃*𝑥 𝑦◡𝐴𝑥) |
4 | vex 3434 | . . . . 5 ⊢ 𝑦 ∈ V | |
5 | vex 3434 | . . . . 5 ⊢ 𝑥 ∈ V | |
6 | 4, 5 | brcnv 5788 | . . . 4 ⊢ (𝑦◡𝐴𝑥 ↔ 𝑥𝐴𝑦) |
7 | 6 | mobii 2549 | . . 3 ⊢ (∃*𝑥 𝑦◡𝐴𝑥 ↔ ∃*𝑥 𝑥𝐴𝑦) |
8 | 7 | albii 1825 | . 2 ⊢ (∀𝑦∃*𝑥 𝑦◡𝐴𝑥 ↔ ∀𝑦∃*𝑥 𝑥𝐴𝑦) |
9 | 3, 8 | bitri 274 | 1 ⊢ (Fun ◡𝐴 ↔ ∀𝑦∃*𝑥 𝑥𝐴𝑦) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 205 ∀wal 1539 ∃*wmo 2539 class class class wbr 5078 ◡ccnv 5587 Rel wrel 5593 Fun wfun 6424 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1801 ax-4 1815 ax-5 1916 ax-6 1974 ax-7 2014 ax-8 2111 ax-9 2119 ax-10 2140 ax-11 2157 ax-12 2174 ax-ext 2710 ax-sep 5226 ax-nul 5233 ax-pr 5355 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3an 1087 df-tru 1544 df-fal 1554 df-ex 1786 df-nf 1790 df-sb 2071 df-mo 2541 df-eu 2570 df-clab 2717 df-cleq 2731 df-clel 2817 df-nfc 2890 df-ral 3070 df-rab 3074 df-v 3432 df-dif 3894 df-un 3896 df-in 3898 df-ss 3908 df-nul 4262 df-if 4465 df-sn 4567 df-pr 4569 df-op 4573 df-br 5079 df-opab 5141 df-id 5488 df-xp 5594 df-rel 5595 df-cnv 5596 df-co 5597 df-fun 6432 |
This theorem is referenced by: funcnv 6499 fun2cnv 6501 fun11 6504 dff12 6665 1stconst 7924 2ndconst 7925 |
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