Users' Mathboxes Mathbox for Alexander van der Vekens < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  fsetprcnexALT Structured version   Visualization version   GIF version

Theorem fsetprcnexALT 47012
Description: First version of proof for fsetprcnex 8901, which was much more complicated. (Contributed by AV, 14-Sep-2024.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
fsetprcnexALT (((𝐴𝑉𝐴 ≠ ∅) ∧ 𝐵 ∉ V) → {𝑓𝑓:𝐴𝐵} ∉ V)
Distinct variable groups:   𝐴,𝑓   𝐵,𝑓
Allowed substitution hint:   𝑉(𝑓)

Proof of Theorem fsetprcnexALT
Dummy variables 𝑎 𝑏 𝑔 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 abanssl 4317 . 2 {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ⊆ {𝑓𝑓:𝐴𝐵}
2 n0 4359 . . . . . 6 (𝐴 ≠ ∅ ↔ ∃𝑦 𝑦𝐴)
3 vex 3482 . . . . . . . . . . . 12 𝑦 ∈ V
43a1i 11 . . . . . . . . . . 11 ((𝑦𝐴𝐴𝑉) → 𝑦 ∈ V)
5 fsetsnprcnex 47005 . . . . . . . . . . 11 ((𝑦 ∈ V ∧ 𝐵 ∉ V) → {𝑓𝑓:{𝑦}⟶𝐵} ∉ V)
64, 5sylan 580 . . . . . . . . . 10 (((𝑦𝐴𝐴𝑉) ∧ 𝐵 ∉ V) → {𝑓𝑓:{𝑦}⟶𝐵} ∉ V)
7 df-nel 3045 . . . . . . . . . 10 ({𝑓𝑓:{𝑦}⟶𝐵} ∉ V ↔ ¬ {𝑓𝑓:{𝑦}⟶𝐵} ∈ V)
86, 7sylib 218 . . . . . . . . 9 (((𝑦𝐴𝐴𝑉) ∧ 𝐵 ∉ V) → ¬ {𝑓𝑓:{𝑦}⟶𝐵} ∈ V)
9 eqid 2735 . . . . . . . . . . . . 13 {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} = {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)}
10 eqid 2735 . . . . . . . . . . . . 13 {𝑓𝑓:{𝑦}⟶𝐵} = {𝑓𝑓:{𝑦}⟶𝐵}
11 eqid 2735 . . . . . . . . . . . . 13 (𝑔 ∈ {𝑓𝑓:{𝑦}⟶𝐵} ↦ (𝑎𝐴 ↦ (𝑔𝑦))) = (𝑔 ∈ {𝑓𝑓:{𝑦}⟶𝐵} ↦ (𝑎𝐴 ↦ (𝑔𝑦)))
129, 10, 11cfsetsnfsetf1o 47011 . . . . . . . . . . . 12 ((𝐴𝑉𝑦𝐴) → (𝑔 ∈ {𝑓𝑓:{𝑦}⟶𝐵} ↦ (𝑎𝐴 ↦ (𝑔𝑦))):{𝑓𝑓:{𝑦}⟶𝐵}–1-1-onto→{𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)})
1312ancoms 458 . . . . . . . . . . 11 ((𝑦𝐴𝐴𝑉) → (𝑔 ∈ {𝑓𝑓:{𝑦}⟶𝐵} ↦ (𝑎𝐴 ↦ (𝑔𝑦))):{𝑓𝑓:{𝑦}⟶𝐵}–1-1-onto→{𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)})
1413adantr 480 . . . . . . . . . 10 (((𝑦𝐴𝐴𝑉) ∧ 𝐵 ∉ V) → (𝑔 ∈ {𝑓𝑓:{𝑦}⟶𝐵} ↦ (𝑎𝐴 ↦ (𝑔𝑦))):{𝑓𝑓:{𝑦}⟶𝐵}–1-1-onto→{𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)})
15 f1ovv 7981 . . . . . . . . . . 11 ((𝑔 ∈ {𝑓𝑓:{𝑦}⟶𝐵} ↦ (𝑎𝐴 ↦ (𝑔𝑦))):{𝑓𝑓:{𝑦}⟶𝐵}–1-1-onto→{𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} → ({𝑓𝑓:{𝑦}⟶𝐵} ∈ V ↔ {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∈ V))
1615bicomd 223 . . . . . . . . . 10 ((𝑔 ∈ {𝑓𝑓:{𝑦}⟶𝐵} ↦ (𝑎𝐴 ↦ (𝑔𝑦))):{𝑓𝑓:{𝑦}⟶𝐵}–1-1-onto→{𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} → ({𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∈ V ↔ {𝑓𝑓:{𝑦}⟶𝐵} ∈ V))
1714, 16syl 17 . . . . . . . . 9 (((𝑦𝐴𝐴𝑉) ∧ 𝐵 ∉ V) → ({𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∈ V ↔ {𝑓𝑓:{𝑦}⟶𝐵} ∈ V))
188, 17mtbird 325 . . . . . . . 8 (((𝑦𝐴𝐴𝑉) ∧ 𝐵 ∉ V) → ¬ {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∈ V)
1918exp31 419 . . . . . . 7 (𝑦𝐴 → (𝐴𝑉 → (𝐵 ∉ V → ¬ {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∈ V)))
2019exlimiv 1928 . . . . . 6 (∃𝑦 𝑦𝐴 → (𝐴𝑉 → (𝐵 ∉ V → ¬ {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∈ V)))
212, 20sylbi 217 . . . . 5 (𝐴 ≠ ∅ → (𝐴𝑉 → (𝐵 ∉ V → ¬ {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∈ V)))
2221impcom 407 . . . 4 ((𝐴𝑉𝐴 ≠ ∅) → (𝐵 ∉ V → ¬ {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∈ V))
2322imp 406 . . 3 (((𝐴𝑉𝐴 ≠ ∅) ∧ 𝐵 ∉ V) → ¬ {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∈ V)
24 df-nel 3045 . . 3 ({𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∉ V ↔ ¬ {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∈ V)
2523, 24sylibr 234 . 2 (((𝐴𝑉𝐴 ≠ ∅) ∧ 𝐵 ∉ V) → {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∉ V)
26 prcssprc 5333 . 2 (({𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ⊆ {𝑓𝑓:𝐴𝐵} ∧ {𝑓 ∣ (𝑓:𝐴𝐵 ∧ ∃𝑏𝐵𝑧𝐴 (𝑓𝑧) = 𝑏)} ∉ V) → {𝑓𝑓:𝐴𝐵} ∉ V)
271, 25, 26sylancr 587 1 (((𝐴𝑉𝐴 ≠ ∅) ∧ 𝐵 ∉ V) → {𝑓𝑓:𝐴𝐵} ∉ V)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 206  wa 395   = wceq 1537  wex 1776  wcel 2106  {cab 2712  wne 2938  wnel 3044  wral 3059  wrex 3068  Vcvv 3478  wss 3963  c0 4339  {csn 4631  cmpt 5231  wf 6559  1-1-ontowf1o 6562  cfv 6563
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-10 2139  ax-11 2155  ax-12 2175  ax-ext 2706  ax-rep 5285  ax-sep 5302  ax-nul 5312  ax-pr 5438  ax-un 7754
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-nf 1781  df-sb 2063  df-mo 2538  df-eu 2567  df-clab 2713  df-cleq 2727  df-clel 2814  df-nfc 2890  df-ne 2939  df-nel 3045  df-ral 3060  df-rex 3069  df-reu 3379  df-rab 3434  df-v 3480  df-sbc 3792  df-csb 3909  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-nul 4340  df-if 4532  df-sn 4632  df-pr 4634  df-op 4638  df-uni 4913  df-iun 4998  df-br 5149  df-opab 5211  df-mpt 5232  df-id 5583  df-xp 5695  df-rel 5696  df-cnv 5697  df-co 5698  df-dm 5699  df-rn 5700  df-res 5701  df-ima 5702  df-iota 6516  df-fun 6565  df-fn 6566  df-f 6567  df-f1 6568  df-fo 6569  df-f1o 6570  df-fv 6571
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator