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| Mirrors > Home > ILE Home > Th. List > funsng | GIF version | ||
| Description: A singleton of an ordered pair is a function. Theorem 10.5 of [Quine] p. 65. (Contributed by NM, 28-Jun-2011.) |
| Ref | Expression |
|---|---|
| funsng | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → Fun {〈𝐴, 𝐵〉}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | funcnvsn 5365 | . 2 ⊢ Fun ◡{〈𝐵, 𝐴〉} | |
| 2 | cnvsng 5213 | . . . 4 ⊢ ((𝐵 ∈ 𝑊 ∧ 𝐴 ∈ 𝑉) → ◡{〈𝐵, 𝐴〉} = {〈𝐴, 𝐵〉}) | |
| 3 | 2 | ancoms 268 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ◡{〈𝐵, 𝐴〉} = {〈𝐴, 𝐵〉}) |
| 4 | 3 | funeqd 5339 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (Fun ◡{〈𝐵, 𝐴〉} ↔ Fun {〈𝐴, 𝐵〉})) |
| 5 | 1, 4 | mpbii 148 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → Fun {〈𝐴, 𝐵〉}) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 = wceq 1395 ∈ wcel 2200 {csn 3666 〈cop 3669 ◡ccnv 4717 Fun wfun 5311 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4201 ax-pow 4257 ax-pr 4292 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2801 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-br 4083 df-opab 4145 df-id 4383 df-xp 4724 df-rel 4725 df-cnv 4726 df-co 4727 df-fun 5319 |
| This theorem is referenced by: fnsng 5367 funsn 5368 funprg 5370 funtpg 5371 setsfun 13062 setsfun0 13063 strle1g 13134 1strbas 13145 |
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