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Theorem f1ofvswap 7326
Description: Swapping two values in a bijection between two classes yields another bijection between those classes. (Contributed by BTernaryTau, 31-Aug-2024.)
Assertion
Ref Expression
f1ofvswap ((𝐹:𝐴1-1-onto𝐵𝑋𝐴𝑌𝐴) → ((𝐹 ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, (𝐹𝑌)⟩, ⟨𝑌, (𝐹𝑋)⟩}):𝐴1-1-onto𝐵)

Proof of Theorem f1ofvswap
StepHypRef Expression
1 f1oi 6887 . . . . . 6 ( I ↾ (𝐴 ∖ {𝑋, 𝑌})):(𝐴 ∖ {𝑋, 𝑌})–1-1-onto→(𝐴 ∖ {𝑋, 𝑌})
2 f1oprswap 6893 . . . . . 6 ((𝑋𝐴𝑌𝐴) → {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}:{𝑋, 𝑌}–1-1-onto→{𝑋, 𝑌})
3 disjdifr 4479 . . . . . . 7 ((𝐴 ∖ {𝑋, 𝑌}) ∩ {𝑋, 𝑌}) = ∅
4 f1oun 6868 . . . . . . 7 (((( I ↾ (𝐴 ∖ {𝑋, 𝑌})):(𝐴 ∖ {𝑋, 𝑌})–1-1-onto→(𝐴 ∖ {𝑋, 𝑌}) ∧ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}:{𝑋, 𝑌}–1-1-onto→{𝑋, 𝑌}) ∧ (((𝐴 ∖ {𝑋, 𝑌}) ∩ {𝑋, 𝑌}) = ∅ ∧ ((𝐴 ∖ {𝑋, 𝑌}) ∩ {𝑋, 𝑌}) = ∅)) → (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}):((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌})–1-1-onto→((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌}))
53, 3, 4mpanr12 705 . . . . . 6 ((( I ↾ (𝐴 ∖ {𝑋, 𝑌})):(𝐴 ∖ {𝑋, 𝑌})–1-1-onto→(𝐴 ∖ {𝑋, 𝑌}) ∧ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}:{𝑋, 𝑌}–1-1-onto→{𝑋, 𝑌}) → (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}):((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌})–1-1-onto→((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌}))
61, 2, 5sylancr 587 . . . . 5 ((𝑋𝐴𝑌𝐴) → (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}):((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌})–1-1-onto→((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌}))
7 prssi 4826 . . . . . . 7 ((𝑋𝐴𝑌𝐴) → {𝑋, 𝑌} ⊆ 𝐴)
8 undifr 4489 . . . . . . 7 ({𝑋, 𝑌} ⊆ 𝐴 ↔ ((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌}) = 𝐴)
97, 8sylib 218 . . . . . 6 ((𝑋𝐴𝑌𝐴) → ((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌}) = 𝐴)
10 f1oeq23 6840 . . . . . 6 ((((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌}) = 𝐴 ∧ ((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌}) = 𝐴) → ((( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}):((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌})–1-1-onto→((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌}) ↔ (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}):𝐴1-1-onto𝐴))
119, 9, 10syl2anc 584 . . . . 5 ((𝑋𝐴𝑌𝐴) → ((( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}):((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌})–1-1-onto→((𝐴 ∖ {𝑋, 𝑌}) ∪ {𝑋, 𝑌}) ↔ (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}):𝐴1-1-onto𝐴))
126, 11mpbid 232 . . . 4 ((𝑋𝐴𝑌𝐴) → (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}):𝐴1-1-onto𝐴)
13 f1oco 6872 . . . 4 ((𝐹:𝐴1-1-onto𝐵 ∧ (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}):𝐴1-1-onto𝐴) → (𝐹 ∘ (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩})):𝐴1-1-onto𝐵)
1412, 13sylan2 593 . . 3 ((𝐹:𝐴1-1-onto𝐵 ∧ (𝑋𝐴𝑌𝐴)) → (𝐹 ∘ (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩})):𝐴1-1-onto𝐵)
15143impb 1114 . 2 ((𝐹:𝐴1-1-onto𝐵𝑋𝐴𝑌𝐴) → (𝐹 ∘ (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩})):𝐴1-1-onto𝐵)
16 f1ofn 6850 . . . 4 (𝐹:𝐴1-1-onto𝐵𝐹 Fn 𝐴)
17 coundi 6269 . . . . . 6 (𝐹 ∘ (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩})) = ((𝐹 ∘ ( I ↾ (𝐴 ∖ {𝑋, 𝑌}))) ∪ (𝐹 ∘ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}))
18 fcoconst 7154 . . . . . . . . . . 11 ((𝐹 Fn 𝐴𝑌𝐴) → (𝐹 ∘ ({𝑋} × {𝑌})) = ({𝑋} × {(𝐹𝑌)}))
19183adant2 1130 . . . . . . . . . 10 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → (𝐹 ∘ ({𝑋} × {𝑌})) = ({𝑋} × {(𝐹𝑌)}))
20 xpsng 7159 . . . . . . . . . . . 12 ((𝑋𝐴𝑌𝐴) → ({𝑋} × {𝑌}) = {⟨𝑋, 𝑌⟩})
2120coeq2d 5876 . . . . . . . . . . 11 ((𝑋𝐴𝑌𝐴) → (𝐹 ∘ ({𝑋} × {𝑌})) = (𝐹 ∘ {⟨𝑋, 𝑌⟩}))
22213adant1 1129 . . . . . . . . . 10 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → (𝐹 ∘ ({𝑋} × {𝑌})) = (𝐹 ∘ {⟨𝑋, 𝑌⟩}))
23 fvex 6920 . . . . . . . . . . . 12 (𝐹𝑌) ∈ V
24 xpsng 7159 . . . . . . . . . . . 12 ((𝑋𝐴 ∧ (𝐹𝑌) ∈ V) → ({𝑋} × {(𝐹𝑌)}) = {⟨𝑋, (𝐹𝑌)⟩})
2523, 24mpan2 691 . . . . . . . . . . 11 (𝑋𝐴 → ({𝑋} × {(𝐹𝑌)}) = {⟨𝑋, (𝐹𝑌)⟩})
26253ad2ant2 1133 . . . . . . . . . 10 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → ({𝑋} × {(𝐹𝑌)}) = {⟨𝑋, (𝐹𝑌)⟩})
2719, 22, 263eqtr3d 2783 . . . . . . . . 9 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → (𝐹 ∘ {⟨𝑋, 𝑌⟩}) = {⟨𝑋, (𝐹𝑌)⟩})
28 fcoconst 7154 . . . . . . . . . . 11 ((𝐹 Fn 𝐴𝑋𝐴) → (𝐹 ∘ ({𝑌} × {𝑋})) = ({𝑌} × {(𝐹𝑋)}))
29283adant3 1131 . . . . . . . . . 10 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → (𝐹 ∘ ({𝑌} × {𝑋})) = ({𝑌} × {(𝐹𝑋)}))
30 xpsng 7159 . . . . . . . . . . . . 13 ((𝑌𝐴𝑋𝐴) → ({𝑌} × {𝑋}) = {⟨𝑌, 𝑋⟩})
3130coeq2d 5876 . . . . . . . . . . . 12 ((𝑌𝐴𝑋𝐴) → (𝐹 ∘ ({𝑌} × {𝑋})) = (𝐹 ∘ {⟨𝑌, 𝑋⟩}))
3231ancoms 458 . . . . . . . . . . 11 ((𝑋𝐴𝑌𝐴) → (𝐹 ∘ ({𝑌} × {𝑋})) = (𝐹 ∘ {⟨𝑌, 𝑋⟩}))
33323adant1 1129 . . . . . . . . . 10 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → (𝐹 ∘ ({𝑌} × {𝑋})) = (𝐹 ∘ {⟨𝑌, 𝑋⟩}))
34 fvex 6920 . . . . . . . . . . . 12 (𝐹𝑋) ∈ V
35 xpsng 7159 . . . . . . . . . . . 12 ((𝑌𝐴 ∧ (𝐹𝑋) ∈ V) → ({𝑌} × {(𝐹𝑋)}) = {⟨𝑌, (𝐹𝑋)⟩})
3634, 35mpan2 691 . . . . . . . . . . 11 (𝑌𝐴 → ({𝑌} × {(𝐹𝑋)}) = {⟨𝑌, (𝐹𝑋)⟩})
37363ad2ant3 1134 . . . . . . . . . 10 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → ({𝑌} × {(𝐹𝑋)}) = {⟨𝑌, (𝐹𝑋)⟩})
3829, 33, 373eqtr3d 2783 . . . . . . . . 9 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → (𝐹 ∘ {⟨𝑌, 𝑋⟩}) = {⟨𝑌, (𝐹𝑋)⟩})
3927, 38uneq12d 4179 . . . . . . . 8 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → ((𝐹 ∘ {⟨𝑋, 𝑌⟩}) ∪ (𝐹 ∘ {⟨𝑌, 𝑋⟩})) = ({⟨𝑋, (𝐹𝑌)⟩} ∪ {⟨𝑌, (𝐹𝑋)⟩}))
40 df-pr 4634 . . . . . . . . . 10 {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩} = ({⟨𝑋, 𝑌⟩} ∪ {⟨𝑌, 𝑋⟩})
4140coeq2i 5874 . . . . . . . . 9 (𝐹 ∘ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}) = (𝐹 ∘ ({⟨𝑋, 𝑌⟩} ∪ {⟨𝑌, 𝑋⟩}))
42 coundi 6269 . . . . . . . . 9 (𝐹 ∘ ({⟨𝑋, 𝑌⟩} ∪ {⟨𝑌, 𝑋⟩})) = ((𝐹 ∘ {⟨𝑋, 𝑌⟩}) ∪ (𝐹 ∘ {⟨𝑌, 𝑋⟩}))
4341, 42eqtri 2763 . . . . . . . 8 (𝐹 ∘ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}) = ((𝐹 ∘ {⟨𝑋, 𝑌⟩}) ∪ (𝐹 ∘ {⟨𝑌, 𝑋⟩}))
44 df-pr 4634 . . . . . . . 8 {⟨𝑋, (𝐹𝑌)⟩, ⟨𝑌, (𝐹𝑋)⟩} = ({⟨𝑋, (𝐹𝑌)⟩} ∪ {⟨𝑌, (𝐹𝑋)⟩})
4539, 43, 443eqtr4g 2800 . . . . . . 7 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → (𝐹 ∘ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩}) = {⟨𝑋, (𝐹𝑌)⟩, ⟨𝑌, (𝐹𝑋)⟩})
4645uneq2d 4178 . . . . . 6 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → ((𝐹 ∘ ( I ↾ (𝐴 ∖ {𝑋, 𝑌}))) ∪ (𝐹 ∘ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩})) = ((𝐹 ∘ ( I ↾ (𝐴 ∖ {𝑋, 𝑌}))) ∪ {⟨𝑋, (𝐹𝑌)⟩, ⟨𝑌, (𝐹𝑋)⟩}))
4717, 46eqtrid 2787 . . . . 5 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → (𝐹 ∘ (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩})) = ((𝐹 ∘ ( I ↾ (𝐴 ∖ {𝑋, 𝑌}))) ∪ {⟨𝑋, (𝐹𝑌)⟩, ⟨𝑌, (𝐹𝑋)⟩}))
48 coires1 6286 . . . . . 6 (𝐹 ∘ ( I ↾ (𝐴 ∖ {𝑋, 𝑌}))) = (𝐹 ↾ (𝐴 ∖ {𝑋, 𝑌}))
4948uneq1i 4174 . . . . 5 ((𝐹 ∘ ( I ↾ (𝐴 ∖ {𝑋, 𝑌}))) ∪ {⟨𝑋, (𝐹𝑌)⟩, ⟨𝑌, (𝐹𝑋)⟩}) = ((𝐹 ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, (𝐹𝑌)⟩, ⟨𝑌, (𝐹𝑋)⟩})
5047, 49eqtrdi 2791 . . . 4 ((𝐹 Fn 𝐴𝑋𝐴𝑌𝐴) → (𝐹 ∘ (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩})) = ((𝐹 ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, (𝐹𝑌)⟩, ⟨𝑌, (𝐹𝑋)⟩}))
5116, 50syl3an1 1162 . . 3 ((𝐹:𝐴1-1-onto𝐵𝑋𝐴𝑌𝐴) → (𝐹 ∘ (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩})) = ((𝐹 ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, (𝐹𝑌)⟩, ⟨𝑌, (𝐹𝑋)⟩}))
5251f1oeq1d 6844 . 2 ((𝐹:𝐴1-1-onto𝐵𝑋𝐴𝑌𝐴) → ((𝐹 ∘ (( I ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, 𝑌⟩, ⟨𝑌, 𝑋⟩})):𝐴1-1-onto𝐵 ↔ ((𝐹 ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, (𝐹𝑌)⟩, ⟨𝑌, (𝐹𝑋)⟩}):𝐴1-1-onto𝐵))
5315, 52mpbid 232 1 ((𝐹:𝐴1-1-onto𝐵𝑋𝐴𝑌𝐴) → ((𝐹 ↾ (𝐴 ∖ {𝑋, 𝑌})) ∪ {⟨𝑋, (𝐹𝑌)⟩, ⟨𝑌, (𝐹𝑋)⟩}):𝐴1-1-onto𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  w3a 1086   = wceq 1537  wcel 2106  Vcvv 3478  cdif 3960  cun 3961  cin 3962  wss 3963  c0 4339  {csn 4631  {cpr 4633  cop 4637   I cid 5582   × cxp 5687  cres 5691  ccom 5693   Fn wfn 6558  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-sep 5302  ax-nul 5312  ax-pr 5438
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-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-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:  dif1en  9199  dif1enOLD  9201
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