Theorem infunsdom 9635

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 8536	. . 3 ⊢ (𝐴 ≺ 𝐵 → 𝐴 ≼ 𝐵)
2		infunsdom1 9634	. . . . 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 8536	. . . . . . 7 ⊢ (𝐵 ≺ 𝑋 → 𝐵 ≼ 𝑋)
8	7	ad2antll 727	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐵 ≼ 𝑋)
9		numdom 9463	. . . . . 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 8536	. . . . . . 7 ⊢ (𝐴 ≺ 𝑋 → 𝐴 ≼ 𝑋)
12	11	ad2antrl 726	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐴 ≼ 𝑋)
13		numdom 9463	. . . . . 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 9417	. . . . 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 4128	. . . . . 6 ⊢ (𝐴 ∪ 𝐵) = (𝐵 ∪ 𝐴)
19		infunsdom1 9634	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐵 ≼ 𝐴 ∧ 𝐴 ≺ 𝑋)) → (𝐵 ∪ 𝐴) ≺ 𝑋)
20	18, 19	eqbrtrid 5100	. . . . 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 2110   ∪ cun 3933   class class class wbr 5065  dom cdm 5554  ωcom 7579   ≼ cdom 8506   ≺ csdm 8507  cardccrd 9363

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 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-rep 5189  ax-sep 5202  ax-nul 5209  ax-pow 5265  ax-pr 5329  ax-un 7460  ax-inf2 9103

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rmo 3146  df-rab 3147  df-v 3496  df-sbc 3772  df-csb 3883  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-pss 3953  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4567  df-pr 4569  df-tp 4571  df-op 4573  df-uni 4838  df-int 4876  df-iun 4920  df-br 5066  df-opab 5128  df-mpt 5146  df-tr 5172  df-id 5459  df-eprel 5464  df-po 5473  df-so 5474  df-fr 5513  df-se 5514  df-we 5515  df-xp 5560  df-rel 5561  df-cnv 5562  df-co 5563  df-dm 5564  df-rn 5565  df-res 5566  df-ima 5567  df-pred 6147  df-ord 6193  df-on 6194  df-lim 6195  df-suc 6196  df-iota 6313  df-fun 6356  df-fn 6357  df-f 6358  df-f1 6359  df-fo 6360  df-f1o 6361  df-fv 6362  df-isom 6363  df-riota 7113  df-ov 7158  df-oprab 7159  df-mpo 7160  df-om 7580  df-1st 7688  df-2nd 7689  df-wrecs 7946  df-recs 8007  df-rdg 8045  df-1o 8101  df-2o 8102  df-oadd 8105  df-er 8288  df-en 8509  df-dom 8510  df-sdom 8511  df-fin 8512  df-oi 8973  df-dju 9329  df-card 9367

This theorem is referenced by:  csdfil  22501