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Theorem mapsn 7941
Description: The value of set exponentiation with a singleton exponent. Theorem 98 of [Suppes] p. 89. (Contributed by NM, 10-Dec-2003.)
Hypotheses
Ref Expression
map0.1 𝐴 ∈ V
map0.2 𝐵 ∈ V
Assertion
Ref Expression
mapsn (𝐴𝑚 {𝐵}) = {𝑓 ∣ ∃𝑦𝐴 𝑓 = {⟨𝐵, 𝑦⟩}}
Distinct variable groups:   𝑦,𝑓,𝐴   𝐵,𝑓,𝑦

Proof of Theorem mapsn
StepHypRef Expression
1 map0.1 . . . 4 𝐴 ∈ V
2 snex 4938 . . . 4 {𝐵} ∈ V
31, 2elmap 7928 . . 3 (𝑓 ∈ (𝐴𝑚 {𝐵}) ↔ 𝑓:{𝐵}⟶𝐴)
4 ffn 6083 . . . . . . . 8 (𝑓:{𝐵}⟶𝐴𝑓 Fn {𝐵})
5 map0.2 . . . . . . . . 9 𝐵 ∈ V
65snid 4241 . . . . . . . 8 𝐵 ∈ {𝐵}
7 fneu 6033 . . . . . . . 8 ((𝑓 Fn {𝐵} ∧ 𝐵 ∈ {𝐵}) → ∃!𝑦 𝐵𝑓𝑦)
84, 6, 7sylancl 695 . . . . . . 7 (𝑓:{𝐵}⟶𝐴 → ∃!𝑦 𝐵𝑓𝑦)
9 euabsn 4293 . . . . . . . 8 (∃!𝑦 𝐵𝑓𝑦 ↔ ∃𝑦{𝑦𝐵𝑓𝑦} = {𝑦})
10 frel 6088 . . . . . . . . . . . 12 (𝑓:{𝐵}⟶𝐴 → Rel 𝑓)
11 relimasn 5523 . . . . . . . . . . . 12 (Rel 𝑓 → (𝑓 “ {𝐵}) = {𝑦𝐵𝑓𝑦})
1210, 11syl 17 . . . . . . . . . . 11 (𝑓:{𝐵}⟶𝐴 → (𝑓 “ {𝐵}) = {𝑦𝐵𝑓𝑦})
13 imadmrn 5511 . . . . . . . . . . . 12 (𝑓 “ dom 𝑓) = ran 𝑓
14 fdm 6089 . . . . . . . . . . . . 13 (𝑓:{𝐵}⟶𝐴 → dom 𝑓 = {𝐵})
1514imaeq2d 5501 . . . . . . . . . . . 12 (𝑓:{𝐵}⟶𝐴 → (𝑓 “ dom 𝑓) = (𝑓 “ {𝐵}))
1613, 15syl5reqr 2700 . . . . . . . . . . 11 (𝑓:{𝐵}⟶𝐴 → (𝑓 “ {𝐵}) = ran 𝑓)
1712, 16eqtr3d 2687 . . . . . . . . . 10 (𝑓:{𝐵}⟶𝐴 → {𝑦𝐵𝑓𝑦} = ran 𝑓)
1817eqeq1d 2653 . . . . . . . . 9 (𝑓:{𝐵}⟶𝐴 → ({𝑦𝐵𝑓𝑦} = {𝑦} ↔ ran 𝑓 = {𝑦}))
1918exbidv 1890 . . . . . . . 8 (𝑓:{𝐵}⟶𝐴 → (∃𝑦{𝑦𝐵𝑓𝑦} = {𝑦} ↔ ∃𝑦ran 𝑓 = {𝑦}))
209, 19syl5bb 272 . . . . . . 7 (𝑓:{𝐵}⟶𝐴 → (∃!𝑦 𝐵𝑓𝑦 ↔ ∃𝑦ran 𝑓 = {𝑦}))
218, 20mpbid 222 . . . . . 6 (𝑓:{𝐵}⟶𝐴 → ∃𝑦ran 𝑓 = {𝑦})
22 vex 3234 . . . . . . . . . . 11 𝑦 ∈ V
2322snid 4241 . . . . . . . . . 10 𝑦 ∈ {𝑦}
24 eleq2 2719 . . . . . . . . . 10 (ran 𝑓 = {𝑦} → (𝑦 ∈ ran 𝑓𝑦 ∈ {𝑦}))
2523, 24mpbiri 248 . . . . . . . . 9 (ran 𝑓 = {𝑦} → 𝑦 ∈ ran 𝑓)
26 frn 6091 . . . . . . . . . 10 (𝑓:{𝐵}⟶𝐴 → ran 𝑓𝐴)
2726sseld 3635 . . . . . . . . 9 (𝑓:{𝐵}⟶𝐴 → (𝑦 ∈ ran 𝑓𝑦𝐴))
2825, 27syl5 34 . . . . . . . 8 (𝑓:{𝐵}⟶𝐴 → (ran 𝑓 = {𝑦} → 𝑦𝐴))
29 dffn4 6159 . . . . . . . . . . . 12 (𝑓 Fn {𝐵} ↔ 𝑓:{𝐵}–onto→ran 𝑓)
304, 29sylib 208 . . . . . . . . . . 11 (𝑓:{𝐵}⟶𝐴𝑓:{𝐵}–onto→ran 𝑓)
31 fof 6153 . . . . . . . . . . 11 (𝑓:{𝐵}–onto→ran 𝑓𝑓:{𝐵}⟶ran 𝑓)
3230, 31syl 17 . . . . . . . . . 10 (𝑓:{𝐵}⟶𝐴𝑓:{𝐵}⟶ran 𝑓)
33 feq3 6066 . . . . . . . . . 10 (ran 𝑓 = {𝑦} → (𝑓:{𝐵}⟶ran 𝑓𝑓:{𝐵}⟶{𝑦}))
3432, 33syl5ibcom 235 . . . . . . . . 9 (𝑓:{𝐵}⟶𝐴 → (ran 𝑓 = {𝑦} → 𝑓:{𝐵}⟶{𝑦}))
355, 22fsn 6442 . . . . . . . . 9 (𝑓:{𝐵}⟶{𝑦} ↔ 𝑓 = {⟨𝐵, 𝑦⟩})
3634, 35syl6ib 241 . . . . . . . 8 (𝑓:{𝐵}⟶𝐴 → (ran 𝑓 = {𝑦} → 𝑓 = {⟨𝐵, 𝑦⟩}))
3728, 36jcad 554 . . . . . . 7 (𝑓:{𝐵}⟶𝐴 → (ran 𝑓 = {𝑦} → (𝑦𝐴𝑓 = {⟨𝐵, 𝑦⟩})))
3837eximdv 1886 . . . . . 6 (𝑓:{𝐵}⟶𝐴 → (∃𝑦ran 𝑓 = {𝑦} → ∃𝑦(𝑦𝐴𝑓 = {⟨𝐵, 𝑦⟩})))
3921, 38mpd 15 . . . . 5 (𝑓:{𝐵}⟶𝐴 → ∃𝑦(𝑦𝐴𝑓 = {⟨𝐵, 𝑦⟩}))
40 df-rex 2947 . . . . 5 (∃𝑦𝐴 𝑓 = {⟨𝐵, 𝑦⟩} ↔ ∃𝑦(𝑦𝐴𝑓 = {⟨𝐵, 𝑦⟩}))
4139, 40sylibr 224 . . . 4 (𝑓:{𝐵}⟶𝐴 → ∃𝑦𝐴 𝑓 = {⟨𝐵, 𝑦⟩})
425, 22f1osn 6214 . . . . . . . . 9 {⟨𝐵, 𝑦⟩}:{𝐵}–1-1-onto→{𝑦}
43 f1oeq1 6165 . . . . . . . . 9 (𝑓 = {⟨𝐵, 𝑦⟩} → (𝑓:{𝐵}–1-1-onto→{𝑦} ↔ {⟨𝐵, 𝑦⟩}:{𝐵}–1-1-onto→{𝑦}))
4442, 43mpbiri 248 . . . . . . . 8 (𝑓 = {⟨𝐵, 𝑦⟩} → 𝑓:{𝐵}–1-1-onto→{𝑦})
45 f1of 6175 . . . . . . . 8 (𝑓:{𝐵}–1-1-onto→{𝑦} → 𝑓:{𝐵}⟶{𝑦})
4644, 45syl 17 . . . . . . 7 (𝑓 = {⟨𝐵, 𝑦⟩} → 𝑓:{𝐵}⟶{𝑦})
47 snssi 4371 . . . . . . 7 (𝑦𝐴 → {𝑦} ⊆ 𝐴)
48 fss 6094 . . . . . . 7 ((𝑓:{𝐵}⟶{𝑦} ∧ {𝑦} ⊆ 𝐴) → 𝑓:{𝐵}⟶𝐴)
4946, 47, 48syl2an 493 . . . . . 6 ((𝑓 = {⟨𝐵, 𝑦⟩} ∧ 𝑦𝐴) → 𝑓:{𝐵}⟶𝐴)
5049expcom 450 . . . . 5 (𝑦𝐴 → (𝑓 = {⟨𝐵, 𝑦⟩} → 𝑓:{𝐵}⟶𝐴))
5150rexlimiv 3056 . . . 4 (∃𝑦𝐴 𝑓 = {⟨𝐵, 𝑦⟩} → 𝑓:{𝐵}⟶𝐴)
5241, 51impbii 199 . . 3 (𝑓:{𝐵}⟶𝐴 ↔ ∃𝑦𝐴 𝑓 = {⟨𝐵, 𝑦⟩})
533, 52bitri 264 . 2 (𝑓 ∈ (𝐴𝑚 {𝐵}) ↔ ∃𝑦𝐴 𝑓 = {⟨𝐵, 𝑦⟩})
5453abbi2i 2767 1 (𝐴𝑚 {𝐵}) = {𝑓 ∣ ∃𝑦𝐴 𝑓 = {⟨𝐵, 𝑦⟩}}
Colors of variables: wff setvar class
Syntax hints:  wa 383   = wceq 1523  wex 1744  wcel 2030  ∃!weu 2498  {cab 2637  wrex 2942  Vcvv 3231  wss 3607  {csn 4210  cop 4216   class class class wbr 4685  dom cdm 5143  ran crn 5144  cima 5146  Rel wrel 5148   Fn wfn 5921  wf 5922  ontowfo 5924  1-1-ontowf1o 5925  (class class class)co 6690  𝑚 cmap 7899
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-br 4686  df-opab 4746  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-map 7901
This theorem is referenced by:  mapsnen  8076
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