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Mirrors > Home > ILE Home > Th. List > funsn | GIF version |
Description: A singleton of an ordered pair is a function. Theorem 10.5 of [Quine] p. 65. (Contributed by NM, 12-Aug-1994.) |
Ref | Expression |
---|---|
funsn.1 | ⊢ 𝐴 ∈ V |
funsn.2 | ⊢ 𝐵 ∈ V |
Ref | Expression |
---|---|
funsn | ⊢ Fun {〈𝐴, 𝐵〉} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | funsn.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | funsn.2 | . 2 ⊢ 𝐵 ∈ V | |
3 | funsng 4966 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → Fun {〈𝐴, 𝐵〉}) | |
4 | 1, 2, 3 | mp2an 416 | 1 ⊢ Fun {〈𝐴, 𝐵〉} |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1433 Vcvv 2601 {csn 3398 〈cop 3401 Fun wfun 4916 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-sep 3896 ax-pow 3948 ax-pr 3964 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ral 2353 df-rex 2354 df-v 2603 df-un 2977 df-in 2979 df-ss 2986 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-br 3786 df-opab 3840 df-id 4048 df-xp 4369 df-rel 4370 df-cnv 4371 df-co 4372 df-fun 4924 |
This theorem is referenced by: funtp 4972 fun0 4977 fvsn 5379 |
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