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Theorem sucdom2 8107
 Description: Strict dominance of a set over another set implies dominance over its successor. (Contributed by Mario Carneiro, 12-Jan-2013.) (Proof shortened by Mario Carneiro, 27-Apr-2015.)
Assertion
Ref Expression
sucdom2 (𝐴𝐵 → suc 𝐴𝐵)

Proof of Theorem sucdom2
Dummy variables 𝑤 𝑓 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 sdomdom 7934 . . 3 (𝐴𝐵𝐴𝐵)
2 brdomi 7917 . . 3 (𝐴𝐵 → ∃𝑓 𝑓:𝐴1-1𝐵)
31, 2syl 17 . 2 (𝐴𝐵 → ∃𝑓 𝑓:𝐴1-1𝐵)
4 relsdom 7913 . . . . . . 7 Rel ≺
54brrelexi 5123 . . . . . 6 (𝐴𝐵𝐴 ∈ V)
65adantr 481 . . . . 5 ((𝐴𝐵𝑓:𝐴1-1𝐵) → 𝐴 ∈ V)
7 vex 3192 . . . . . . 7 𝑓 ∈ V
87rnex 7054 . . . . . 6 ran 𝑓 ∈ V
98a1i 11 . . . . 5 ((𝐴𝐵𝑓:𝐴1-1𝐵) → ran 𝑓 ∈ V)
10 f1f1orn 6110 . . . . . . 7 (𝑓:𝐴1-1𝐵𝑓:𝐴1-1-onto→ran 𝑓)
1110adantl 482 . . . . . 6 ((𝐴𝐵𝑓:𝐴1-1𝐵) → 𝑓:𝐴1-1-onto→ran 𝑓)
12 f1of1 6098 . . . . . 6 (𝑓:𝐴1-1-onto→ran 𝑓𝑓:𝐴1-1→ran 𝑓)
1311, 12syl 17 . . . . 5 ((𝐴𝐵𝑓:𝐴1-1𝐵) → 𝑓:𝐴1-1→ran 𝑓)
14 f1dom2g 7924 . . . . 5 ((𝐴 ∈ V ∧ ran 𝑓 ∈ V ∧ 𝑓:𝐴1-1→ran 𝑓) → 𝐴 ≼ ran 𝑓)
156, 9, 13, 14syl3anc 1323 . . . 4 ((𝐴𝐵𝑓:𝐴1-1𝐵) → 𝐴 ≼ ran 𝑓)
16 sdomnen 7935 . . . . . . . 8 (𝐴𝐵 → ¬ 𝐴𝐵)
1716adantr 481 . . . . . . 7 ((𝐴𝐵𝑓:𝐴1-1𝐵) → ¬ 𝐴𝐵)
18 ssdif0 3921 . . . . . . . 8 (𝐵 ⊆ ran 𝑓 ↔ (𝐵 ∖ ran 𝑓) = ∅)
19 simplr 791 . . . . . . . . . . 11 (((𝐴𝐵𝑓:𝐴1-1𝐵) ∧ 𝐵 ⊆ ran 𝑓) → 𝑓:𝐴1-1𝐵)
20 f1f 6063 . . . . . . . . . . . . . . 15 (𝑓:𝐴1-1𝐵𝑓:𝐴𝐵)
21 df-f 5856 . . . . . . . . . . . . . . 15 (𝑓:𝐴𝐵 ↔ (𝑓 Fn 𝐴 ∧ ran 𝑓𝐵))
2220, 21sylib 208 . . . . . . . . . . . . . 14 (𝑓:𝐴1-1𝐵 → (𝑓 Fn 𝐴 ∧ ran 𝑓𝐵))
2322simprd 479 . . . . . . . . . . . . 13 (𝑓:𝐴1-1𝐵 → ran 𝑓𝐵)
2419, 23syl 17 . . . . . . . . . . . 12 (((𝐴𝐵𝑓:𝐴1-1𝐵) ∧ 𝐵 ⊆ ran 𝑓) → ran 𝑓𝐵)
25 simpr 477 . . . . . . . . . . . 12 (((𝐴𝐵𝑓:𝐴1-1𝐵) ∧ 𝐵 ⊆ ran 𝑓) → 𝐵 ⊆ ran 𝑓)
2624, 25eqssd 3604 . . . . . . . . . . 11 (((𝐴𝐵𝑓:𝐴1-1𝐵) ∧ 𝐵 ⊆ ran 𝑓) → ran 𝑓 = 𝐵)
27 dff1o5 6108 . . . . . . . . . . 11 (𝑓:𝐴1-1-onto𝐵 ↔ (𝑓:𝐴1-1𝐵 ∧ ran 𝑓 = 𝐵))
2819, 26, 27sylanbrc 697 . . . . . . . . . 10 (((𝐴𝐵𝑓:𝐴1-1𝐵) ∧ 𝐵 ⊆ ran 𝑓) → 𝑓:𝐴1-1-onto𝐵)
29 f1oen3g 7922 . . . . . . . . . 10 ((𝑓 ∈ V ∧ 𝑓:𝐴1-1-onto𝐵) → 𝐴𝐵)
307, 28, 29sylancr 694 . . . . . . . . 9 (((𝐴𝐵𝑓:𝐴1-1𝐵) ∧ 𝐵 ⊆ ran 𝑓) → 𝐴𝐵)
3130ex 450 . . . . . . . 8 ((𝐴𝐵𝑓:𝐴1-1𝐵) → (𝐵 ⊆ ran 𝑓𝐴𝐵))
3218, 31syl5bir 233 . . . . . . 7 ((𝐴𝐵𝑓:𝐴1-1𝐵) → ((𝐵 ∖ ran 𝑓) = ∅ → 𝐴𝐵))
3317, 32mtod 189 . . . . . 6 ((𝐴𝐵𝑓:𝐴1-1𝐵) → ¬ (𝐵 ∖ ran 𝑓) = ∅)
34 neq0 3911 . . . . . 6 (¬ (𝐵 ∖ ran 𝑓) = ∅ ↔ ∃𝑤 𝑤 ∈ (𝐵 ∖ ran 𝑓))
3533, 34sylib 208 . . . . 5 ((𝐴𝐵𝑓:𝐴1-1𝐵) → ∃𝑤 𝑤 ∈ (𝐵 ∖ ran 𝑓))
36 snssi 4313 . . . . . . 7 (𝑤 ∈ (𝐵 ∖ ran 𝑓) → {𝑤} ⊆ (𝐵 ∖ ran 𝑓))
37 vex 3192 . . . . . . . . 9 𝑤 ∈ V
38 en2sn 7988 . . . . . . . . 9 ((𝐴 ∈ V ∧ 𝑤 ∈ V) → {𝐴} ≈ {𝑤})
396, 37, 38sylancl 693 . . . . . . . 8 ((𝐴𝐵𝑓:𝐴1-1𝐵) → {𝐴} ≈ {𝑤})
404brrelex2i 5124 . . . . . . . . . 10 (𝐴𝐵𝐵 ∈ V)
4140adantr 481 . . . . . . . . 9 ((𝐴𝐵𝑓:𝐴1-1𝐵) → 𝐵 ∈ V)
42 difexg 4773 . . . . . . . . 9 (𝐵 ∈ V → (𝐵 ∖ ran 𝑓) ∈ V)
43 ssdomg 7952 . . . . . . . . 9 ((𝐵 ∖ ran 𝑓) ∈ V → ({𝑤} ⊆ (𝐵 ∖ ran 𝑓) → {𝑤} ≼ (𝐵 ∖ ran 𝑓)))
4441, 42, 433syl 18 . . . . . . . 8 ((𝐴𝐵𝑓:𝐴1-1𝐵) → ({𝑤} ⊆ (𝐵 ∖ ran 𝑓) → {𝑤} ≼ (𝐵 ∖ ran 𝑓)))
45 endomtr 7965 . . . . . . . 8 (({𝐴} ≈ {𝑤} ∧ {𝑤} ≼ (𝐵 ∖ ran 𝑓)) → {𝐴} ≼ (𝐵 ∖ ran 𝑓))
4639, 44, 45syl6an 567 . . . . . . 7 ((𝐴𝐵𝑓:𝐴1-1𝐵) → ({𝑤} ⊆ (𝐵 ∖ ran 𝑓) → {𝐴} ≼ (𝐵 ∖ ran 𝑓)))
4736, 46syl5 34 . . . . . 6 ((𝐴𝐵𝑓:𝐴1-1𝐵) → (𝑤 ∈ (𝐵 ∖ ran 𝑓) → {𝐴} ≼ (𝐵 ∖ ran 𝑓)))
4847exlimdv 1858 . . . . 5 ((𝐴𝐵𝑓:𝐴1-1𝐵) → (∃𝑤 𝑤 ∈ (𝐵 ∖ ran 𝑓) → {𝐴} ≼ (𝐵 ∖ ran 𝑓)))
4935, 48mpd 15 . . . 4 ((𝐴𝐵𝑓:𝐴1-1𝐵) → {𝐴} ≼ (𝐵 ∖ ran 𝑓))
50 disjdif 4017 . . . . 5 (ran 𝑓 ∩ (𝐵 ∖ ran 𝑓)) = ∅
5150a1i 11 . . . 4 ((𝐴𝐵𝑓:𝐴1-1𝐵) → (ran 𝑓 ∩ (𝐵 ∖ ran 𝑓)) = ∅)
52 undom 7999 . . . 4 (((𝐴 ≼ ran 𝑓 ∧ {𝐴} ≼ (𝐵 ∖ ran 𝑓)) ∧ (ran 𝑓 ∩ (𝐵 ∖ ran 𝑓)) = ∅) → (𝐴 ∪ {𝐴}) ≼ (ran 𝑓 ∪ (𝐵 ∖ ran 𝑓)))
5315, 49, 51, 52syl21anc 1322 . . 3 ((𝐴𝐵𝑓:𝐴1-1𝐵) → (𝐴 ∪ {𝐴}) ≼ (ran 𝑓 ∪ (𝐵 ∖ ran 𝑓)))
54 df-suc 5693 . . . 4 suc 𝐴 = (𝐴 ∪ {𝐴})
5554a1i 11 . . 3 ((𝐴𝐵𝑓:𝐴1-1𝐵) → suc 𝐴 = (𝐴 ∪ {𝐴}))
56 undif2 4021 . . . 4 (ran 𝑓 ∪ (𝐵 ∖ ran 𝑓)) = (ran 𝑓𝐵)
5723adantl 482 . . . . 5 ((𝐴𝐵𝑓:𝐴1-1𝐵) → ran 𝑓𝐵)
58 ssequn1 3766 . . . . 5 (ran 𝑓𝐵 ↔ (ran 𝑓𝐵) = 𝐵)
5957, 58sylib 208 . . . 4 ((𝐴𝐵𝑓:𝐴1-1𝐵) → (ran 𝑓𝐵) = 𝐵)
6056, 59syl5req 2668 . . 3 ((𝐴𝐵𝑓:𝐴1-1𝐵) → 𝐵 = (ran 𝑓 ∪ (𝐵 ∖ ran 𝑓)))
6153, 55, 603brtr4d 4650 . 2 ((𝐴𝐵𝑓:𝐴1-1𝐵) → suc 𝐴𝐵)
623, 61exlimddv 1860 1 (𝐴𝐵 → suc 𝐴𝐵)
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 384   = wceq 1480  ∃wex 1701   ∈ wcel 1987  Vcvv 3189   ∖ cdif 3556   ∪ cun 3557   ∩ cin 3558   ⊆ wss 3559  ∅c0 3896  {csn 4153   class class class wbr 4618  ran crn 5080  suc csuc 5689   Fn wfn 5847  ⟶wf 5848  –1-1→wf1 5849  –1-1-onto→wf1o 5851   ≈ cen 7903   ≼ cdom 7904   ≺ csdm 7905 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6909 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ral 2912  df-rex 2913  df-rab 2916  df-v 3191  df-dif 3562  df-un 3564  df-in 3566  df-ss 3573  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-op 4160  df-uni 4408  df-br 4619  df-opab 4679  df-id 4994  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-suc 5693  df-fun 5854  df-fn 5855  df-f 5856  df-f1 5857  df-fo 5858  df-f1o 5859  df-1o 7512  df-er 7694  df-en 7907  df-dom 7908  df-sdom 7909 This theorem is referenced by:  sucdom  8108  card2inf  8411
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