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Mirrors > Home > ILE Home > Th. List > funcnveq | GIF version |
Description: Another way of expressing that a class is single-rooted. Counterpart to dffun2 5180. (Contributed by Jim Kingdon, 24-Dec-2018.) |
Ref | Expression |
---|---|
funcnveq | ⊢ (Fun ◡𝐴 ↔ ∀𝑥∀𝑦∀𝑧((𝑥𝐴𝑦 ∧ 𝑧𝐴𝑦) → 𝑥 = 𝑧)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | relcnv 4964 | . . 3 ⊢ Rel ◡𝐴 | |
2 | dffun2 5180 | . . 3 ⊢ (Fun ◡𝐴 ↔ (Rel ◡𝐴 ∧ ∀𝑦∀𝑥∀𝑧((𝑦◡𝐴𝑥 ∧ 𝑦◡𝐴𝑧) → 𝑥 = 𝑧))) | |
3 | 1, 2 | mpbiran 925 | . 2 ⊢ (Fun ◡𝐴 ↔ ∀𝑦∀𝑥∀𝑧((𝑦◡𝐴𝑥 ∧ 𝑦◡𝐴𝑧) → 𝑥 = 𝑧)) |
4 | alcom 1458 | . 2 ⊢ (∀𝑦∀𝑥∀𝑧((𝑦◡𝐴𝑥 ∧ 𝑦◡𝐴𝑧) → 𝑥 = 𝑧) ↔ ∀𝑥∀𝑦∀𝑧((𝑦◡𝐴𝑥 ∧ 𝑦◡𝐴𝑧) → 𝑥 = 𝑧)) | |
5 | vex 2715 | . . . . . . 7 ⊢ 𝑦 ∈ V | |
6 | vex 2715 | . . . . . . 7 ⊢ 𝑥 ∈ V | |
7 | 5, 6 | brcnv 4769 | . . . . . 6 ⊢ (𝑦◡𝐴𝑥 ↔ 𝑥𝐴𝑦) |
8 | vex 2715 | . . . . . . 7 ⊢ 𝑧 ∈ V | |
9 | 5, 8 | brcnv 4769 | . . . . . 6 ⊢ (𝑦◡𝐴𝑧 ↔ 𝑧𝐴𝑦) |
10 | 7, 9 | anbi12i 456 | . . . . 5 ⊢ ((𝑦◡𝐴𝑥 ∧ 𝑦◡𝐴𝑧) ↔ (𝑥𝐴𝑦 ∧ 𝑧𝐴𝑦)) |
11 | 10 | imbi1i 237 | . . . 4 ⊢ (((𝑦◡𝐴𝑥 ∧ 𝑦◡𝐴𝑧) → 𝑥 = 𝑧) ↔ ((𝑥𝐴𝑦 ∧ 𝑧𝐴𝑦) → 𝑥 = 𝑧)) |
12 | 11 | 2albii 1451 | . . 3 ⊢ (∀𝑦∀𝑧((𝑦◡𝐴𝑥 ∧ 𝑦◡𝐴𝑧) → 𝑥 = 𝑧) ↔ ∀𝑦∀𝑧((𝑥𝐴𝑦 ∧ 𝑧𝐴𝑦) → 𝑥 = 𝑧)) |
13 | 12 | albii 1450 | . 2 ⊢ (∀𝑥∀𝑦∀𝑧((𝑦◡𝐴𝑥 ∧ 𝑦◡𝐴𝑧) → 𝑥 = 𝑧) ↔ ∀𝑥∀𝑦∀𝑧((𝑥𝐴𝑦 ∧ 𝑧𝐴𝑦) → 𝑥 = 𝑧)) |
14 | 3, 4, 13 | 3bitri 205 | 1 ⊢ (Fun ◡𝐴 ↔ ∀𝑥∀𝑦∀𝑧((𝑥𝐴𝑦 ∧ 𝑧𝐴𝑦) → 𝑥 = 𝑧)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 ∀wal 1333 class class class wbr 3965 ◡ccnv 4585 Rel wrel 4591 Fun wfun 5164 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1427 ax-7 1428 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-10 1485 ax-11 1486 ax-i12 1487 ax-bndl 1489 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-14 2131 ax-ext 2139 ax-sep 4082 ax-pow 4135 ax-pr 4169 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1338 df-nf 1441 df-sb 1743 df-eu 2009 df-mo 2010 df-clab 2144 df-cleq 2150 df-clel 2153 df-nfc 2288 df-ral 2440 df-rex 2441 df-v 2714 df-un 3106 df-in 3108 df-ss 3115 df-pw 3545 df-sn 3566 df-pr 3567 df-op 3569 df-br 3966 df-opab 4026 df-id 4253 df-xp 4592 df-rel 4593 df-cnv 4594 df-co 4595 df-fun 5172 |
This theorem is referenced by: imain 5252 |
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