Theorem infunsdom 10135

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 8927	. . 3 ⊢ (𝐴 ≺ 𝐵 → 𝐴 ≼ 𝐵)
2		infunsdom1 10134	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≼ 𝐵 ∧ 𝐵 ≺ 𝑋)) → (𝐴 ∪ 𝐵) ≺ 𝑋)
3	2	anass1rs 656	. . . 4 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ 𝐵 ≺ 𝑋) ∧ 𝐴 ≼ 𝐵) → (𝐴 ∪ 𝐵) ≺ 𝑋)
4	3	adantlrl 721	. . 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 767	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝑋 ∈ dom card)
7		sdomdom 8927	. . . . . . 7 ⊢ (𝐵 ≺ 𝑋 → 𝐵 ≼ 𝑋)
8	7	ad2antll 730	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐵 ≼ 𝑋)
9		numdom 9960	. . . . . 6 ⊢ ((𝑋 ∈ dom card ∧ 𝐵 ≼ 𝑋) → 𝐵 ∈ dom card)
10	6, 8, 9	syl2anc 585	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐵 ∈ dom card)
11		sdomdom 8927	. . . . . . 7 ⊢ (𝐴 ≺ 𝑋 → 𝐴 ≼ 𝑋)
12	11	ad2antrl 729	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐴 ≼ 𝑋)
13		numdom 9960	. . . . . 6 ⊢ ((𝑋 ∈ dom card ∧ 𝐴 ≼ 𝑋) → 𝐴 ∈ dom card)
14	6, 12, 13	syl2anc 585	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐴 ∈ dom card)
15		domtri2 9913	. . . . 5 ⊢ ((𝐵 ∈ dom card ∧ 𝐴 ∈ dom card) → (𝐵 ≼ 𝐴 ↔ ¬ 𝐴 ≺ 𝐵))
16	10, 14, 15	syl2anc 585	. . . 4 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → (𝐵 ≼ 𝐴 ↔ ¬ 𝐴 ≺ 𝐵))
17	16	biimpar 477	. . 3 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ ¬ 𝐴 ≺ 𝐵) → 𝐵 ≼ 𝐴)
18		uncom 4098	. . . . . 6 ⊢ (𝐴 ∪ 𝐵) = (𝐵 ∪ 𝐴)
19		infunsdom1 10134	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐵 ≼ 𝐴 ∧ 𝐴 ≺ 𝑋)) → (𝐵 ∪ 𝐴) ≺ 𝑋)
20	18, 19	eqbrtrid 5120	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐵 ≼ 𝐴 ∧ 𝐴 ≺ 𝑋)) → (𝐴 ∪ 𝐵) ≺ 𝑋)
21	20	anass1rs 656	. . . 4 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ 𝐴 ≺ 𝑋) ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≺ 𝑋)
22	21	adantlrr 722	. . 3 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≺ 𝑋)
23	17, 22	syldan 592	. 2 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ ¬ 𝐴 ≺ 𝐵) → (𝐴 ∪ 𝐵) ≺ 𝑋)
24	5, 23	pm2.61dan 813	1 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → (𝐴 ∪ 𝐵) ≺ 𝑋)

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 206   ∧ wa 395   ∈ wcel 2114   ∪ cun 3887   class class class wbr 5085  dom cdm 5631  ωcom 7817   ≼ cdom 8891   ≺ csdm 8892  cardccrd 9859

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-rep 5212  ax-sep 5231  ax-nul 5241  ax-pow 5307  ax-pr 5375  ax-un 7689  ax-inf2 9562

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-rmo 3342  df-reu 3343  df-rab 3390  df-v 3431  df-sbc 3729  df-csb 3838  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-pss 3909  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-int 4890  df-iun 4935  df-br 5086  df-opab 5148  df-mpt 5167  df-tr 5193  df-id 5526  df-eprel 5531  df-po 5539  df-so 5540  df-fr 5584  df-se 5585  df-we 5586  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-pred 6265  df-ord 6326  df-on 6327  df-lim 6328  df-suc 6329  df-iota 6454  df-fun 6500  df-fn 6501  df-f 6502  df-f1 6503  df-fo 6504  df-f1o 6505  df-fv 6506  df-isom 6507  df-riota 7324  df-ov 7370  df-om 7818  df-1st 7942  df-2nd 7943  df-frecs 8231  df-wrecs 8262  df-recs 8311  df-rdg 8349  df-1o 8405  df-2o 8406  df-er 8643  df-en 8894  df-dom 8895  df-sdom 8896  df-fin 8897  df-oi 9425  df-dju 9825  df-card 9863

This theorem is referenced by:  csdfil  23859