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Theorem funcnvuni 7317
Description: The union of a chain (with respect to inclusion) of single-rooted sets is single-rooted. (See funcnv 6136 for "single-rooted" definition.) (Contributed by NM, 11-Aug-2004.)
Assertion
Ref Expression
funcnvuni (∀𝑓𝐴 (Fun 𝑓 ∧ ∀𝑔𝐴 (𝑓𝑔𝑔𝑓)) → Fun 𝐴)
Distinct variable group:   𝑓,𝑔,𝐴

Proof of Theorem funcnvuni
Dummy variables 𝑥 𝑦 𝑧 𝑤 𝑣 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 cnveq 5464 . . . . . . . 8 (𝑥 = 𝑣𝑥 = 𝑣)
21eqeq2d 2775 . . . . . . 7 (𝑥 = 𝑣 → (𝑧 = 𝑥𝑧 = 𝑣))
32cbvrexv 3320 . . . . . 6 (∃𝑥𝐴 𝑧 = 𝑥 ↔ ∃𝑣𝐴 𝑧 = 𝑣)
4 cnveq 5464 . . . . . . . . . . 11 (𝑓 = 𝑣𝑓 = 𝑣)
54funeqd 6090 . . . . . . . . . 10 (𝑓 = 𝑣 → (Fun 𝑓 ↔ Fun 𝑣))
6 sseq1 3786 . . . . . . . . . . . 12 (𝑓 = 𝑣 → (𝑓𝑔𝑣𝑔))
7 sseq2 3787 . . . . . . . . . . . 12 (𝑓 = 𝑣 → (𝑔𝑓𝑔𝑣))
86, 7orbi12d 942 . . . . . . . . . . 11 (𝑓 = 𝑣 → ((𝑓𝑔𝑔𝑓) ↔ (𝑣𝑔𝑔𝑣)))
98ralbidv 3133 . . . . . . . . . 10 (𝑓 = 𝑣 → (∀𝑔𝐴 (𝑓𝑔𝑔𝑓) ↔ ∀𝑔𝐴 (𝑣𝑔𝑔𝑣)))
105, 9anbi12d 624 . . . . . . . . 9 (𝑓 = 𝑣 → ((Fun 𝑓 ∧ ∀𝑔𝐴 (𝑓𝑔𝑔𝑓)) ↔ (Fun 𝑣 ∧ ∀𝑔𝐴 (𝑣𝑔𝑔𝑣))))
1110rspcv 3457 . . . . . . . 8 (𝑣𝐴 → (∀𝑓𝐴 (Fun 𝑓 ∧ ∀𝑔𝐴 (𝑓𝑔𝑔𝑓)) → (Fun 𝑣 ∧ ∀𝑔𝐴 (𝑣𝑔𝑔𝑣))))
12 funeq 6088 . . . . . . . . . 10 (𝑧 = 𝑣 → (Fun 𝑧 ↔ Fun 𝑣))
1312biimprcd 241 . . . . . . . . 9 (Fun 𝑣 → (𝑧 = 𝑣 → Fun 𝑧))
14 sseq2 3787 . . . . . . . . . . . . . . 15 (𝑔 = 𝑥 → (𝑣𝑔𝑣𝑥))
15 sseq1 3786 . . . . . . . . . . . . . . 15 (𝑔 = 𝑥 → (𝑔𝑣𝑥𝑣))
1614, 15orbi12d 942 . . . . . . . . . . . . . 14 (𝑔 = 𝑥 → ((𝑣𝑔𝑔𝑣) ↔ (𝑣𝑥𝑥𝑣)))
1716rspcv 3457 . . . . . . . . . . . . 13 (𝑥𝐴 → (∀𝑔𝐴 (𝑣𝑔𝑔𝑣) → (𝑣𝑥𝑥𝑣)))
18 cnvss 5463 . . . . . . . . . . . . . . . 16 (𝑣𝑥𝑣𝑥)
19 cnvss 5463 . . . . . . . . . . . . . . . 16 (𝑥𝑣𝑥𝑣)
2018, 19orim12i 932 . . . . . . . . . . . . . . 15 ((𝑣𝑥𝑥𝑣) → (𝑣𝑥𝑥𝑣))
21 sseq12 3788 . . . . . . . . . . . . . . . . 17 ((𝑧 = 𝑣𝑤 = 𝑥) → (𝑧𝑤𝑣𝑥))
2221ancoms 450 . . . . . . . . . . . . . . . 16 ((𝑤 = 𝑥𝑧 = 𝑣) → (𝑧𝑤𝑣𝑥))
23 sseq12 3788 . . . . . . . . . . . . . . . 16 ((𝑤 = 𝑥𝑧 = 𝑣) → (𝑤𝑧𝑥𝑣))
2422, 23orbi12d 942 . . . . . . . . . . . . . . 15 ((𝑤 = 𝑥𝑧 = 𝑣) → ((𝑧𝑤𝑤𝑧) ↔ (𝑣𝑥𝑥𝑣)))
2520, 24syl5ibrcom 238 . . . . . . . . . . . . . 14 ((𝑣𝑥𝑥𝑣) → ((𝑤 = 𝑥𝑧 = 𝑣) → (𝑧𝑤𝑤𝑧)))
2625expd 404 . . . . . . . . . . . . 13 ((𝑣𝑥𝑥𝑣) → (𝑤 = 𝑥 → (𝑧 = 𝑣 → (𝑧𝑤𝑤𝑧))))
2717, 26syl6com 37 . . . . . . . . . . . 12 (∀𝑔𝐴 (𝑣𝑔𝑔𝑣) → (𝑥𝐴 → (𝑤 = 𝑥 → (𝑧 = 𝑣 → (𝑧𝑤𝑤𝑧)))))
2827rexlimdv 3177 . . . . . . . . . . 11 (∀𝑔𝐴 (𝑣𝑔𝑔𝑣) → (∃𝑥𝐴 𝑤 = 𝑥 → (𝑧 = 𝑣 → (𝑧𝑤𝑤𝑧))))
2928com23 86 . . . . . . . . . 10 (∀𝑔𝐴 (𝑣𝑔𝑔𝑣) → (𝑧 = 𝑣 → (∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧))))
3029alrimdv 2024 . . . . . . . . 9 (∀𝑔𝐴 (𝑣𝑔𝑔𝑣) → (𝑧 = 𝑣 → ∀𝑤(∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧))))
3113, 30anim12ii 611 . . . . . . . 8 ((Fun 𝑣 ∧ ∀𝑔𝐴 (𝑣𝑔𝑔𝑣)) → (𝑧 = 𝑣 → (Fun 𝑧 ∧ ∀𝑤(∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧)))))
3211, 31syl6com 37 . . . . . . 7 (∀𝑓𝐴 (Fun 𝑓 ∧ ∀𝑔𝐴 (𝑓𝑔𝑔𝑓)) → (𝑣𝐴 → (𝑧 = 𝑣 → (Fun 𝑧 ∧ ∀𝑤(∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧))))))
3332rexlimdv 3177 . . . . . 6 (∀𝑓𝐴 (Fun 𝑓 ∧ ∀𝑔𝐴 (𝑓𝑔𝑔𝑓)) → (∃𝑣𝐴 𝑧 = 𝑣 → (Fun 𝑧 ∧ ∀𝑤(∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧)))))
343, 33syl5bi 233 . . . . 5 (∀𝑓𝐴 (Fun 𝑓 ∧ ∀𝑔𝐴 (𝑓𝑔𝑔𝑓)) → (∃𝑥𝐴 𝑧 = 𝑥 → (Fun 𝑧 ∧ ∀𝑤(∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧)))))
3534alrimiv 2022 . . . 4 (∀𝑓𝐴 (Fun 𝑓 ∧ ∀𝑔𝐴 (𝑓𝑔𝑔𝑓)) → ∀𝑧(∃𝑥𝐴 𝑧 = 𝑥 → (Fun 𝑧 ∧ ∀𝑤(∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧)))))
36 df-ral 3060 . . . . 5 (∀𝑧 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (Fun 𝑧 ∧ ∀𝑤 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (𝑧𝑤𝑤𝑧)) ↔ ∀𝑧(𝑧 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} → (Fun 𝑧 ∧ ∀𝑤 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (𝑧𝑤𝑤𝑧))))
37 vex 3353 . . . . . . . 8 𝑧 ∈ V
38 eqeq1 2769 . . . . . . . . 9 (𝑦 = 𝑧 → (𝑦 = 𝑥𝑧 = 𝑥))
3938rexbidv 3199 . . . . . . . 8 (𝑦 = 𝑧 → (∃𝑥𝐴 𝑦 = 𝑥 ↔ ∃𝑥𝐴 𝑧 = 𝑥))
4037, 39elab 3504 . . . . . . 7 (𝑧 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} ↔ ∃𝑥𝐴 𝑧 = 𝑥)
41 eqeq1 2769 . . . . . . . . . 10 (𝑦 = 𝑤 → (𝑦 = 𝑥𝑤 = 𝑥))
4241rexbidv 3199 . . . . . . . . 9 (𝑦 = 𝑤 → (∃𝑥𝐴 𝑦 = 𝑥 ↔ ∃𝑥𝐴 𝑤 = 𝑥))
4342ralab 3524 . . . . . . . 8 (∀𝑤 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (𝑧𝑤𝑤𝑧) ↔ ∀𝑤(∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧)))
4443anbi2i 616 . . . . . . 7 ((Fun 𝑧 ∧ ∀𝑤 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (𝑧𝑤𝑤𝑧)) ↔ (Fun 𝑧 ∧ ∀𝑤(∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧))))
4540, 44imbi12i 341 . . . . . 6 ((𝑧 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} → (Fun 𝑧 ∧ ∀𝑤 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (𝑧𝑤𝑤𝑧))) ↔ (∃𝑥𝐴 𝑧 = 𝑥 → (Fun 𝑧 ∧ ∀𝑤(∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧)))))
4645albii 1914 . . . . 5 (∀𝑧(𝑧 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} → (Fun 𝑧 ∧ ∀𝑤 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (𝑧𝑤𝑤𝑧))) ↔ ∀𝑧(∃𝑥𝐴 𝑧 = 𝑥 → (Fun 𝑧 ∧ ∀𝑤(∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧)))))
4736, 46bitr2i 267 . . . 4 (∀𝑧(∃𝑥𝐴 𝑧 = 𝑥 → (Fun 𝑧 ∧ ∀𝑤(∃𝑥𝐴 𝑤 = 𝑥 → (𝑧𝑤𝑤𝑧)))) ↔ ∀𝑧 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (Fun 𝑧 ∧ ∀𝑤 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (𝑧𝑤𝑤𝑧)))
4835, 47sylib 209 . . 3 (∀𝑓𝐴 (Fun 𝑓 ∧ ∀𝑔𝐴 (𝑓𝑔𝑔𝑓)) → ∀𝑧 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (Fun 𝑧 ∧ ∀𝑤 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (𝑧𝑤𝑤𝑧)))
49 fununi 6142 . . 3 (∀𝑧 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (Fun 𝑧 ∧ ∀𝑤 ∈ {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥} (𝑧𝑤𝑤𝑧)) → Fun {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥})
5048, 49syl 17 . 2 (∀𝑓𝐴 (Fun 𝑓 ∧ ∀𝑔𝐴 (𝑓𝑔𝑔𝑓)) → Fun {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥})
51 cnvuni 5477 . . . 4 𝐴 = 𝑥𝐴 𝑥
52 vex 3353 . . . . . 6 𝑥 ∈ V
5352cnvex 7311 . . . . 5 𝑥 ∈ V
5453dfiun2 4710 . . . 4 𝑥𝐴 𝑥 = {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥}
5551, 54eqtri 2787 . . 3 𝐴 = {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥}
5655funeqi 6089 . 2 (Fun 𝐴 ↔ Fun {𝑦 ∣ ∃𝑥𝐴 𝑦 = 𝑥})
5750, 56sylibr 225 1 (∀𝑓𝐴 (Fun 𝑓 ∧ ∀𝑔𝐴 (𝑓𝑔𝑔𝑓)) → Fun 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 197  wa 384  wo 873  wal 1650   = wceq 1652  wcel 2155  {cab 2751  wral 3055  wrex 3056  wss 3732   cuni 4594   ciun 4676  ccnv 5276  Fun wfun 6062
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1890  ax-4 1904  ax-5 2005  ax-6 2070  ax-7 2105  ax-8 2157  ax-9 2164  ax-10 2183  ax-11 2198  ax-12 2211  ax-13 2352  ax-ext 2743  ax-sep 4941  ax-nul 4949  ax-pow 5001  ax-pr 5062  ax-un 7147
This theorem depends on definitions:  df-bi 198  df-an 385  df-or 874  df-3an 1109  df-tru 1656  df-ex 1875  df-nf 1879  df-sb 2063  df-mo 2565  df-eu 2582  df-clab 2752  df-cleq 2758  df-clel 2761  df-nfc 2896  df-ral 3060  df-rex 3061  df-rab 3064  df-v 3352  df-dif 3735  df-un 3737  df-in 3739  df-ss 3746  df-nul 4080  df-if 4244  df-pw 4317  df-sn 4335  df-pr 4337  df-op 4341  df-uni 4595  df-iun 4678  df-br 4810  df-opab 4872  df-id 5185  df-xp 5283  df-rel 5284  df-cnv 5285  df-co 5286  df-dm 5287  df-rn 5288  df-fun 6070
This theorem is referenced by:  fun11uni  7318
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