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Theorem fsn2 5873
Description: A function that maps a singleton to a class is the singleton of an ordered pair. (Contributed by NM, 19-May-2004.)
Hypothesis
Ref Expression
fsn2.1 𝐴 ∈ V
Assertion
Ref Expression
fsn2 (𝐹:{𝐴}⟶𝐵 ↔ ((𝐹𝐴) ∈ 𝐵𝐹 = {⟨𝐴, (𝐹𝐴)⟩}))

Proof of Theorem fsn2
StepHypRef Expression
1 ffn 5528 . . 3 (𝐹:{𝐴}⟶𝐵𝐹 Fn {𝐴})
2 fsn2.1 . . . . 5 𝐴 ∈ V
32snid 3736 . . . 4 𝐴 ∈ {𝐴}
4 funfvex 5707 . . . . 5 ((Fun 𝐹𝐴 ∈ dom 𝐹) → (𝐹𝐴) ∈ V)
54funfni 5478 . . . 4 ((𝐹 Fn {𝐴} ∧ 𝐴 ∈ {𝐴}) → (𝐹𝐴) ∈ V)
63, 5mpan2 429 . . 3 (𝐹 Fn {𝐴} → (𝐹𝐴) ∈ V)
71, 6syl 14 . 2 (𝐹:{𝐴}⟶𝐵 → (𝐹𝐴) ∈ V)
8 elex 2833 . . 3 ((𝐹𝐴) ∈ 𝐵 → (𝐹𝐴) ∈ V)
98adantr 276 . 2 (((𝐹𝐴) ∈ 𝐵𝐹 = {⟨𝐴, (𝐹𝐴)⟩}) → (𝐹𝐴) ∈ V)
10 ffvelcdm 5832 . . . . . 6 ((𝐹:{𝐴}⟶𝐵𝐴 ∈ {𝐴}) → (𝐹𝐴) ∈ 𝐵)
113, 10mpan2 429 . . . . 5 (𝐹:{𝐴}⟶𝐵 → (𝐹𝐴) ∈ 𝐵)
12 dffn3 5539 . . . . . . . 8 (𝐹 Fn {𝐴} ↔ 𝐹:{𝐴}⟶ran 𝐹)
1312biimpi 120 . . . . . . 7 (𝐹 Fn {𝐴} → 𝐹:{𝐴}⟶ran 𝐹)
14 imadmrn 5131 . . . . . . . . . 10 (𝐹 “ dom 𝐹) = ran 𝐹
15 fndm 5475 . . . . . . . . . . 11 (𝐹 Fn {𝐴} → dom 𝐹 = {𝐴})
1615imaeq2d 5121 . . . . . . . . . 10 (𝐹 Fn {𝐴} → (𝐹 “ dom 𝐹) = (𝐹 “ {𝐴}))
1714, 16eqtr3id 2285 . . . . . . . . 9 (𝐹 Fn {𝐴} → ran 𝐹 = (𝐹 “ {𝐴}))
18 fnsnfv 5756 . . . . . . . . . 10 ((𝐹 Fn {𝐴} ∧ 𝐴 ∈ {𝐴}) → {(𝐹𝐴)} = (𝐹 “ {𝐴}))
193, 18mpan2 429 . . . . . . . . 9 (𝐹 Fn {𝐴} → {(𝐹𝐴)} = (𝐹 “ {𝐴}))
2017, 19eqtr4d 2274 . . . . . . . 8 (𝐹 Fn {𝐴} → ran 𝐹 = {(𝐹𝐴)})
21 feq3 5513 . . . . . . . 8 (ran 𝐹 = {(𝐹𝐴)} → (𝐹:{𝐴}⟶ran 𝐹𝐹:{𝐴}⟶{(𝐹𝐴)}))
2220, 21syl 14 . . . . . . 7 (𝐹 Fn {𝐴} → (𝐹:{𝐴}⟶ran 𝐹𝐹:{𝐴}⟶{(𝐹𝐴)}))
2313, 22mpbid 147 . . . . . 6 (𝐹 Fn {𝐴} → 𝐹:{𝐴}⟶{(𝐹𝐴)})
241, 23syl 14 . . . . 5 (𝐹:{𝐴}⟶𝐵𝐹:{𝐴}⟶{(𝐹𝐴)})
2511, 24jca 306 . . . 4 (𝐹:{𝐴}⟶𝐵 → ((𝐹𝐴) ∈ 𝐵𝐹:{𝐴}⟶{(𝐹𝐴)}))
26 snssi 3854 . . . . 5 ((𝐹𝐴) ∈ 𝐵 → {(𝐹𝐴)} ⊆ 𝐵)
27 fss 5541 . . . . . 6 ((𝐹:{𝐴}⟶{(𝐹𝐴)} ∧ {(𝐹𝐴)} ⊆ 𝐵) → 𝐹:{𝐴}⟶𝐵)
2827ancoms 268 . . . . 5 (({(𝐹𝐴)} ⊆ 𝐵𝐹:{𝐴}⟶{(𝐹𝐴)}) → 𝐹:{𝐴}⟶𝐵)
2926, 28sylan 283 . . . 4 (((𝐹𝐴) ∈ 𝐵𝐹:{𝐴}⟶{(𝐹𝐴)}) → 𝐹:{𝐴}⟶𝐵)
3025, 29impbii 126 . . 3 (𝐹:{𝐴}⟶𝐵 ↔ ((𝐹𝐴) ∈ 𝐵𝐹:{𝐴}⟶{(𝐹𝐴)}))
31 fsng 5872 . . . . 5 ((𝐴 ∈ V ∧ (𝐹𝐴) ∈ V) → (𝐹:{𝐴}⟶{(𝐹𝐴)} ↔ 𝐹 = {⟨𝐴, (𝐹𝐴)⟩}))
322, 31mpan 428 . . . 4 ((𝐹𝐴) ∈ V → (𝐹:{𝐴}⟶{(𝐹𝐴)} ↔ 𝐹 = {⟨𝐴, (𝐹𝐴)⟩}))
3332anbi2d 468 . . 3 ((𝐹𝐴) ∈ V → (((𝐹𝐴) ∈ 𝐵𝐹:{𝐴}⟶{(𝐹𝐴)}) ↔ ((𝐹𝐴) ∈ 𝐵𝐹 = {⟨𝐴, (𝐹𝐴)⟩})))
3430, 33bitrid 192 . 2 ((𝐹𝐴) ∈ V → (𝐹:{𝐴}⟶𝐵 ↔ ((𝐹𝐴) ∈ 𝐵𝐹 = {⟨𝐴, (𝐹𝐴)⟩})))
357, 9, 34pm5.21nii 716 1 (𝐹:{𝐴}⟶𝐵 ↔ ((𝐹𝐴) ∈ 𝐵𝐹 = {⟨𝐴, (𝐹𝐴)⟩}))
Colors of variables: wff set class
Syntax hints:  wa 104  wb 105   = wceq 1402  wcel 2209  Vcvv 2821  wss 3220  {csn 3705  cop 3708  dom cdm 4769  ran crn 4770  cima 4772   Fn wfn 5367  wf 5368  cfv 5372
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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-reu 2535  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-f1 5377  df-fo 5378  df-f1o 5379  df-fv 5380
This theorem is referenced by:  fsn2g  5874  fnressn  5892  fressnfv  5893  mapsnconst  6966  elixpsn  7007  en1  7076
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