Theorem infunsdom 9639

Description: The union of two sets that are strictly dominated by the infinite set 𝑋 is also strictly dominated by 𝑋. (Contributed by Mario Carneiro, 3-May-2015.)

Assertion

Ref	Expression
infunsdom	⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → (𝐴 ∪ 𝐵) ≺ 𝑋)

Proof of Theorem infunsdom

Step	Hyp	Ref	Expression
1		sdomdom 8540	. . 3 ⊢ (𝐴 ≺ 𝐵 → 𝐴 ≼ 𝐵)
2		infunsdom1 9638	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≼ 𝐵 ∧ 𝐵 ≺ 𝑋)) → (𝐴 ∪ 𝐵) ≺ 𝑋)
3	2	anass1rs 653	. . . 4 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ 𝐵 ≺ 𝑋) ∧ 𝐴 ≼ 𝐵) → (𝐴 ∪ 𝐵) ≺ 𝑋)
4	3	adantlrl 718	. . 3 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ 𝐴 ≼ 𝐵) → (𝐴 ∪ 𝐵) ≺ 𝑋)
5	1, 4	sylan2 594	. 2 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ 𝐴 ≺ 𝐵) → (𝐴 ∪ 𝐵) ≺ 𝑋)
6		simpll 765	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝑋 ∈ dom card)
7		sdomdom 8540	. . . . . . 7 ⊢ (𝐵 ≺ 𝑋 → 𝐵 ≼ 𝑋)
8	7	ad2antll 727	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐵 ≼ 𝑋)
9		numdom 9467	. . . . . 6 ⊢ ((𝑋 ∈ dom card ∧ 𝐵 ≼ 𝑋) → 𝐵 ∈ dom card)
10	6, 8, 9	syl2anc 586	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐵 ∈ dom card)
11		sdomdom 8540	. . . . . . 7 ⊢ (𝐴 ≺ 𝑋 → 𝐴 ≼ 𝑋)
12	11	ad2antrl 726	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐴 ≼ 𝑋)
13		numdom 9467	. . . . . 6 ⊢ ((𝑋 ∈ dom card ∧ 𝐴 ≼ 𝑋) → 𝐴 ∈ dom card)
14	6, 12, 13	syl2anc 586	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐴 ∈ dom card)
15		domtri2 9421	. . . . 5 ⊢ ((𝐵 ∈ dom card ∧ 𝐴 ∈ dom card) → (𝐵 ≼ 𝐴 ↔ ¬ 𝐴 ≺ 𝐵))
16	10, 14, 15	syl2anc 586	. . . 4 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → (𝐵 ≼ 𝐴 ↔ ¬ 𝐴 ≺ 𝐵))
17	16	biimpar 480	. . 3 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ ¬ 𝐴 ≺ 𝐵) → 𝐵 ≼ 𝐴)
18		uncom 4132	. . . . . 6 ⊢ (𝐴 ∪ 𝐵) = (𝐵 ∪ 𝐴)
19		infunsdom1 9638	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐵 ≼ 𝐴 ∧ 𝐴 ≺ 𝑋)) → (𝐵 ∪ 𝐴) ≺ 𝑋)
20	18, 19	eqbrtrid 5104	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐵 ≼ 𝐴 ∧ 𝐴 ≺ 𝑋)) → (𝐴 ∪ 𝐵) ≺ 𝑋)
21	20	anass1rs 653	. . . 4 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ 𝐴 ≺ 𝑋) ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≺ 𝑋)
22	21	adantlrr 719	. . 3 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≺ 𝑋)
23	17, 22	syldan 593	. 2 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ ¬ 𝐴 ≺ 𝐵) → (𝐴 ∪ 𝐵) ≺ 𝑋)
24	5, 23	pm2.61dan 811	1 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → (𝐴 ∪ 𝐵) ≺ 𝑋)

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 208   ∧ wa 398   ∈ wcel 2113   ∪ cun 3937   class class class wbr 5069  dom cdm 5558  ωcom 7583   ≼ cdom 8510   ≺ csdm 8511  cardccrd 9367

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2796  ax-rep 5193  ax-sep 5206  ax-nul 5213  ax-pow 5269  ax-pr 5333  ax-un 7464  ax-inf2 9107

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2966  df-ne 3020  df-ral 3146  df-rex 3147  df-reu 3148  df-rmo 3149  df-rab 3150  df-v 3499  df-sbc 3776  df-csb 3887  df-dif 3942  df-un 3944  df-in 3946  df-ss 3955  df-pss 3957  df-nul 4295  df-if 4471  df-pw 4544  df-sn 4571  df-pr 4573  df-tp 4575  df-op 4577  df-uni 4842  df-int 4880  df-iun 4924  df-br 5070  df-opab 5132  df-mpt 5150  df-tr 5176  df-id 5463  df-eprel 5468  df-po 5477  df-so 5478  df-fr 5517  df-se 5518  df-we 5519  df-xp 5564  df-rel 5565  df-cnv 5566  df-co 5567  df-dm 5568  df-rn 5569  df-res 5570  df-ima 5571  df-pred 6151  df-ord 6197  df-on 6198  df-lim 6199  df-suc 6200  df-iota 6317  df-fun 6360  df-fn 6361  df-f 6362  df-f1 6363  df-fo 6364  df-f1o 6365  df-fv 6366  df-isom 6367  df-riota 7117  df-ov 7162  df-oprab 7163  df-mpo 7164  df-om 7584  df-1st 7692  df-2nd 7693  df-wrecs 7950  df-recs 8011  df-rdg 8049  df-1o 8105  df-2o 8106  df-oadd 8109  df-er 8292  df-en 8513  df-dom 8514  df-sdom 8515  df-fin 8516  df-oi 8977  df-dju 9333  df-card 9371

This theorem is referenced by:  csdfil  22505