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Theorem zornn0g 9278
Description: Variant of Zorn's lemma zorng 9277 in which , the union of the empty chain, is not required to be an element of 𝐴. (Contributed by Jeff Madsen, 5-Jan-2011.) (Revised by Mario Carneiro, 9-May-2015.)
Assertion
Ref Expression
zornn0g ((𝐴 ∈ dom card ∧ 𝐴 ≠ ∅ ∧ ∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴)) → ∃𝑥𝐴𝑦𝐴 ¬ 𝑥𝑦)
Distinct variable group:   𝑥,𝑦,𝑧,𝐴

Proof of Theorem zornn0g
Dummy variable 𝑤 is distinct from all other variables.
StepHypRef Expression
1 simp2 1060 . 2 ((𝐴 ∈ dom card ∧ 𝐴 ≠ ∅ ∧ ∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴)) → 𝐴 ≠ ∅)
2 simp1 1059 . . . 4 ((𝐴 ∈ dom card ∧ 𝐴 ≠ ∅ ∧ ∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴)) → 𝐴 ∈ dom card)
3 snfi 7989 . . . . 5 {∅} ∈ Fin
4 finnum 8725 . . . . 5 ({∅} ∈ Fin → {∅} ∈ dom card)
53, 4ax-mp 5 . . . 4 {∅} ∈ dom card
6 unnum 8973 . . . 4 ((𝐴 ∈ dom card ∧ {∅} ∈ dom card) → (𝐴 ∪ {∅}) ∈ dom card)
72, 5, 6sylancl 693 . . 3 ((𝐴 ∈ dom card ∧ 𝐴 ≠ ∅ ∧ ∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴)) → (𝐴 ∪ {∅}) ∈ dom card)
8 uncom 3740 . . . . . . . . 9 (𝐴 ∪ {∅}) = ({∅} ∪ 𝐴)
98sseq2i 3614 . . . . . . . 8 (𝑤 ⊆ (𝐴 ∪ {∅}) ↔ 𝑤 ⊆ ({∅} ∪ 𝐴))
10 ssundif 4029 . . . . . . . 8 (𝑤 ⊆ ({∅} ∪ 𝐴) ↔ (𝑤 ∖ {∅}) ⊆ 𝐴)
119, 10bitri 264 . . . . . . 7 (𝑤 ⊆ (𝐴 ∪ {∅}) ↔ (𝑤 ∖ {∅}) ⊆ 𝐴)
12 difss 3720 . . . . . . . . 9 (𝑤 ∖ {∅}) ⊆ 𝑤
13 soss 5018 . . . . . . . . 9 ((𝑤 ∖ {∅}) ⊆ 𝑤 → ( [] Or 𝑤 → [] Or (𝑤 ∖ {∅})))
1412, 13ax-mp 5 . . . . . . . 8 ( [] Or 𝑤 → [] Or (𝑤 ∖ {∅}))
15 ssdif0 3921 . . . . . . . . . . 11 (𝑤 ⊆ {∅} ↔ (𝑤 ∖ {∅}) = ∅)
16 uni0b 4434 . . . . . . . . . . . . 13 ( 𝑤 = ∅ ↔ 𝑤 ⊆ {∅})
1716biimpri 218 . . . . . . . . . . . 12 (𝑤 ⊆ {∅} → 𝑤 = ∅)
1817eleq1d 2683 . . . . . . . . . . 11 (𝑤 ⊆ {∅} → ( 𝑤 ∈ (𝐴 ∪ {∅}) ↔ ∅ ∈ (𝐴 ∪ {∅})))
1915, 18sylbir 225 . . . . . . . . . 10 ((𝑤 ∖ {∅}) = ∅ → ( 𝑤 ∈ (𝐴 ∪ {∅}) ↔ ∅ ∈ (𝐴 ∪ {∅})))
2019imbi2d 330 . . . . . . . . 9 ((𝑤 ∖ {∅}) = ∅ → ((∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → 𝑤 ∈ (𝐴 ∪ {∅})) ↔ (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → ∅ ∈ (𝐴 ∪ {∅}))))
21 vex 3192 . . . . . . . . . . . . . . 15 𝑤 ∈ V
22 difexg 4773 . . . . . . . . . . . . . . 15 (𝑤 ∈ V → (𝑤 ∖ {∅}) ∈ V)
2321, 22ax-mp 5 . . . . . . . . . . . . . 14 (𝑤 ∖ {∅}) ∈ V
24 sseq1 3610 . . . . . . . . . . . . . . . 16 (𝑧 = (𝑤 ∖ {∅}) → (𝑧𝐴 ↔ (𝑤 ∖ {∅}) ⊆ 𝐴))
25 neeq1 2852 . . . . . . . . . . . . . . . 16 (𝑧 = (𝑤 ∖ {∅}) → (𝑧 ≠ ∅ ↔ (𝑤 ∖ {∅}) ≠ ∅))
26 soeq2 5020 . . . . . . . . . . . . . . . 16 (𝑧 = (𝑤 ∖ {∅}) → ( [] Or 𝑧 ↔ [] Or (𝑤 ∖ {∅})))
2724, 25, 263anbi123d 1396 . . . . . . . . . . . . . . 15 (𝑧 = (𝑤 ∖ {∅}) → ((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) ↔ ((𝑤 ∖ {∅}) ⊆ 𝐴 ∧ (𝑤 ∖ {∅}) ≠ ∅ ∧ [] Or (𝑤 ∖ {∅}))))
28 unieq 4415 . . . . . . . . . . . . . . . 16 (𝑧 = (𝑤 ∖ {∅}) → 𝑧 = (𝑤 ∖ {∅}))
2928eleq1d 2683 . . . . . . . . . . . . . . 15 (𝑧 = (𝑤 ∖ {∅}) → ( 𝑧𝐴 (𝑤 ∖ {∅}) ∈ 𝐴))
3027, 29imbi12d 334 . . . . . . . . . . . . . 14 (𝑧 = (𝑤 ∖ {∅}) → (((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) ↔ (((𝑤 ∖ {∅}) ⊆ 𝐴 ∧ (𝑤 ∖ {∅}) ≠ ∅ ∧ [] Or (𝑤 ∖ {∅})) → (𝑤 ∖ {∅}) ∈ 𝐴)))
3123, 30spcv 3288 . . . . . . . . . . . . 13 (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → (((𝑤 ∖ {∅}) ⊆ 𝐴 ∧ (𝑤 ∖ {∅}) ≠ ∅ ∧ [] Or (𝑤 ∖ {∅})) → (𝑤 ∖ {∅}) ∈ 𝐴))
3231com12 32 . . . . . . . . . . . 12 (((𝑤 ∖ {∅}) ⊆ 𝐴 ∧ (𝑤 ∖ {∅}) ≠ ∅ ∧ [] Or (𝑤 ∖ {∅})) → (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → (𝑤 ∖ {∅}) ∈ 𝐴))
33323expa 1262 . . . . . . . . . . 11 ((((𝑤 ∖ {∅}) ⊆ 𝐴 ∧ (𝑤 ∖ {∅}) ≠ ∅) ∧ [] Or (𝑤 ∖ {∅})) → (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → (𝑤 ∖ {∅}) ∈ 𝐴))
3433an32s 845 . . . . . . . . . 10 ((((𝑤 ∖ {∅}) ⊆ 𝐴 ∧ [] Or (𝑤 ∖ {∅})) ∧ (𝑤 ∖ {∅}) ≠ ∅) → (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → (𝑤 ∖ {∅}) ∈ 𝐴))
35 unidif0 4803 . . . . . . . . . . . 12 (𝑤 ∖ {∅}) = 𝑤
3635eleq1i 2689 . . . . . . . . . . 11 ( (𝑤 ∖ {∅}) ∈ 𝐴 𝑤𝐴)
37 elun1 3763 . . . . . . . . . . 11 ( 𝑤𝐴 𝑤 ∈ (𝐴 ∪ {∅}))
3836, 37sylbi 207 . . . . . . . . . 10 ( (𝑤 ∖ {∅}) ∈ 𝐴 𝑤 ∈ (𝐴 ∪ {∅}))
3934, 38syl6 35 . . . . . . . . 9 ((((𝑤 ∖ {∅}) ⊆ 𝐴 ∧ [] Or (𝑤 ∖ {∅})) ∧ (𝑤 ∖ {∅}) ≠ ∅) → (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → 𝑤 ∈ (𝐴 ∪ {∅})))
40 0ex 4755 . . . . . . . . . . . 12 ∅ ∈ V
4140snid 4184 . . . . . . . . . . 11 ∅ ∈ {∅}
42 elun2 3764 . . . . . . . . . . 11 (∅ ∈ {∅} → ∅ ∈ (𝐴 ∪ {∅}))
4341, 42ax-mp 5 . . . . . . . . . 10 ∅ ∈ (𝐴 ∪ {∅})
44432a1i 12 . . . . . . . . 9 (((𝑤 ∖ {∅}) ⊆ 𝐴 ∧ [] Or (𝑤 ∖ {∅})) → (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → ∅ ∈ (𝐴 ∪ {∅})))
4520, 39, 44pm2.61ne 2875 . . . . . . . 8 (((𝑤 ∖ {∅}) ⊆ 𝐴 ∧ [] Or (𝑤 ∖ {∅})) → (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → 𝑤 ∈ (𝐴 ∪ {∅})))
4614, 45sylan2 491 . . . . . . 7 (((𝑤 ∖ {∅}) ⊆ 𝐴 ∧ [] Or 𝑤) → (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → 𝑤 ∈ (𝐴 ∪ {∅})))
4711, 46sylanb 489 . . . . . 6 ((𝑤 ⊆ (𝐴 ∪ {∅}) ∧ [] Or 𝑤) → (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → 𝑤 ∈ (𝐴 ∪ {∅})))
4847com12 32 . . . . 5 (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → ((𝑤 ⊆ (𝐴 ∪ {∅}) ∧ [] Or 𝑤) → 𝑤 ∈ (𝐴 ∪ {∅})))
4948alrimiv 1852 . . . 4 (∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴) → ∀𝑤((𝑤 ⊆ (𝐴 ∪ {∅}) ∧ [] Or 𝑤) → 𝑤 ∈ (𝐴 ∪ {∅})))
50493ad2ant3 1082 . . 3 ((𝐴 ∈ dom card ∧ 𝐴 ≠ ∅ ∧ ∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴)) → ∀𝑤((𝑤 ⊆ (𝐴 ∪ {∅}) ∧ [] Or 𝑤) → 𝑤 ∈ (𝐴 ∪ {∅})))
51 zorng 9277 . . 3 (((𝐴 ∪ {∅}) ∈ dom card ∧ ∀𝑤((𝑤 ⊆ (𝐴 ∪ {∅}) ∧ [] Or 𝑤) → 𝑤 ∈ (𝐴 ∪ {∅}))) → ∃𝑥 ∈ (𝐴 ∪ {∅})∀𝑦 ∈ (𝐴 ∪ {∅}) ¬ 𝑥𝑦)
527, 50, 51syl2anc 692 . 2 ((𝐴 ∈ dom card ∧ 𝐴 ≠ ∅ ∧ ∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴)) → ∃𝑥 ∈ (𝐴 ∪ {∅})∀𝑦 ∈ (𝐴 ∪ {∅}) ¬ 𝑥𝑦)
53 ssun1 3759 . . . . 5 𝐴 ⊆ (𝐴 ∪ {∅})
54 ssralv 3650 . . . . 5 (𝐴 ⊆ (𝐴 ∪ {∅}) → (∀𝑦 ∈ (𝐴 ∪ {∅}) ¬ 𝑥𝑦 → ∀𝑦𝐴 ¬ 𝑥𝑦))
5553, 54ax-mp 5 . . . 4 (∀𝑦 ∈ (𝐴 ∪ {∅}) ¬ 𝑥𝑦 → ∀𝑦𝐴 ¬ 𝑥𝑦)
5655reximi 3006 . . 3 (∃𝑥 ∈ (𝐴 ∪ {∅})∀𝑦 ∈ (𝐴 ∪ {∅}) ¬ 𝑥𝑦 → ∃𝑥 ∈ (𝐴 ∪ {∅})∀𝑦𝐴 ¬ 𝑥𝑦)
57 rexun 3776 . . . 4 (∃𝑥 ∈ (𝐴 ∪ {∅})∀𝑦𝐴 ¬ 𝑥𝑦 ↔ (∃𝑥𝐴𝑦𝐴 ¬ 𝑥𝑦 ∨ ∃𝑥 ∈ {∅}∀𝑦𝐴 ¬ 𝑥𝑦))
58 simpr 477 . . . . 5 ((𝐴 ≠ ∅ ∧ ∃𝑥𝐴𝑦𝐴 ¬ 𝑥𝑦) → ∃𝑥𝐴𝑦𝐴 ¬ 𝑥𝑦)
59 simpr 477 . . . . . 6 ((𝐴 ≠ ∅ ∧ ∃𝑥 ∈ {∅}∀𝑦𝐴 ¬ 𝑥𝑦) → ∃𝑥 ∈ {∅}∀𝑦𝐴 ¬ 𝑥𝑦)
60 psseq1 3677 . . . . . . . . . . . . 13 (𝑥 = ∅ → (𝑥𝑦 ↔ ∅ ⊊ 𝑦))
61 0pss 3990 . . . . . . . . . . . . 13 (∅ ⊊ 𝑦𝑦 ≠ ∅)
6260, 61syl6bb 276 . . . . . . . . . . . 12 (𝑥 = ∅ → (𝑥𝑦𝑦 ≠ ∅))
6362notbid 308 . . . . . . . . . . 11 (𝑥 = ∅ → (¬ 𝑥𝑦 ↔ ¬ 𝑦 ≠ ∅))
64 nne 2794 . . . . . . . . . . 11 𝑦 ≠ ∅ ↔ 𝑦 = ∅)
6563, 64syl6bb 276 . . . . . . . . . 10 (𝑥 = ∅ → (¬ 𝑥𝑦𝑦 = ∅))
6665ralbidv 2981 . . . . . . . . 9 (𝑥 = ∅ → (∀𝑦𝐴 ¬ 𝑥𝑦 ↔ ∀𝑦𝐴 𝑦 = ∅))
6740, 66rexsn 4199 . . . . . . . 8 (∃𝑥 ∈ {∅}∀𝑦𝐴 ¬ 𝑥𝑦 ↔ ∀𝑦𝐴 𝑦 = ∅)
68 eqsn 4334 . . . . . . . . 9 (𝐴 ≠ ∅ → (𝐴 = {∅} ↔ ∀𝑦𝐴 𝑦 = ∅))
6968biimpar 502 . . . . . . . 8 ((𝐴 ≠ ∅ ∧ ∀𝑦𝐴 𝑦 = ∅) → 𝐴 = {∅})
7067, 69sylan2b 492 . . . . . . 7 ((𝐴 ≠ ∅ ∧ ∃𝑥 ∈ {∅}∀𝑦𝐴 ¬ 𝑥𝑦) → 𝐴 = {∅})
7170rexeqdv 3137 . . . . . 6 ((𝐴 ≠ ∅ ∧ ∃𝑥 ∈ {∅}∀𝑦𝐴 ¬ 𝑥𝑦) → (∃𝑥𝐴𝑦𝐴 ¬ 𝑥𝑦 ↔ ∃𝑥 ∈ {∅}∀𝑦𝐴 ¬ 𝑥𝑦))
7259, 71mpbird 247 . . . . 5 ((𝐴 ≠ ∅ ∧ ∃𝑥 ∈ {∅}∀𝑦𝐴 ¬ 𝑥𝑦) → ∃𝑥𝐴𝑦𝐴 ¬ 𝑥𝑦)
7358, 72jaodan 825 . . . 4 ((𝐴 ≠ ∅ ∧ (∃𝑥𝐴𝑦𝐴 ¬ 𝑥𝑦 ∨ ∃𝑥 ∈ {∅}∀𝑦𝐴 ¬ 𝑥𝑦)) → ∃𝑥𝐴𝑦𝐴 ¬ 𝑥𝑦)
7457, 73sylan2b 492 . . 3 ((𝐴 ≠ ∅ ∧ ∃𝑥 ∈ (𝐴 ∪ {∅})∀𝑦𝐴 ¬ 𝑥𝑦) → ∃𝑥𝐴𝑦𝐴 ¬ 𝑥𝑦)
7556, 74sylan2 491 . 2 ((𝐴 ≠ ∅ ∧ ∃𝑥 ∈ (𝐴 ∪ {∅})∀𝑦 ∈ (𝐴 ∪ {∅}) ¬ 𝑥𝑦) → ∃𝑥𝐴𝑦𝐴 ¬ 𝑥𝑦)
761, 52, 75syl2anc 692 1 ((𝐴 ∈ dom card ∧ 𝐴 ≠ ∅ ∧ ∀𝑧((𝑧𝐴𝑧 ≠ ∅ ∧ [] Or 𝑧) → 𝑧𝐴)) → ∃𝑥𝐴𝑦𝐴 ¬ 𝑥𝑦)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wo 383  wa 384  w3a 1036  wal 1478   = wceq 1480  wcel 1987  wne 2790  wral 2907  wrex 2908  Vcvv 3189  cdif 3556  cun 3557  wss 3559  wpss 3560  c0 3896  {csn 4153   cuni 4407   Or wor 4999  dom cdm 5079   [] crpss 6896  Fincfn 7906  cardccrd 8712
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-rep 4736  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-3or 1037  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-ne 2791  df-ral 2912  df-rex 2913  df-reu 2914  df-rmo 2915  df-rab 2916  df-v 3191  df-sbc 3422  df-csb 3519  df-dif 3562  df-un 3564  df-in 3566  df-ss 3573  df-pss 3575  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-tp 4158  df-op 4160  df-uni 4408  df-int 4446  df-iun 4492  df-br 4619  df-opab 4679  df-mpt 4680  df-tr 4718  df-eprel 4990  df-id 4994  df-po 5000  df-so 5001  df-fr 5038  df-se 5039  df-we 5040  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-pred 5644  df-ord 5690  df-on 5691  df-lim 5692  df-suc 5693  df-iota 5815  df-fun 5854  df-fn 5855  df-f 5856  df-f1 5857  df-fo 5858  df-f1o 5859  df-fv 5860  df-isom 5861  df-riota 6571  df-ov 6613  df-oprab 6614  df-mpt2 6615  df-rpss 6897  df-om 7020  df-wrecs 7359  df-recs 7420  df-rdg 7458  df-1o 7512  df-oadd 7516  df-er 7694  df-en 7907  df-dom 7908  df-fin 7910  df-card 8716  df-cda 8941
This theorem is referenced by:  zornn0  9281  pgpfac1lem5  18406  lbsextlem4  19089  filssufilg  21634
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