Theorem infunsdom 10107

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 8905	. . 3 ⊢ (𝐴 ≺ 𝐵 → 𝐴 ≼ 𝐵)
2		infunsdom1 10106	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≼ 𝐵 ∧ 𝐵 ≺ 𝑋)) → (𝐴 ∪ 𝐵) ≺ 𝑋)
3	2	anass1rs 655	. . . 4 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ 𝐵 ≺ 𝑋) ∧ 𝐴 ≼ 𝐵) → (𝐴 ∪ 𝐵) ≺ 𝑋)
4	3	adantlrl 720	. . 3 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ 𝐴 ≼ 𝐵) → (𝐴 ∪ 𝐵) ≺ 𝑋)
5	1, 4	sylan2 593	. 2 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ 𝐴 ≺ 𝐵) → (𝐴 ∪ 𝐵) ≺ 𝑋)
6		simpll 766	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝑋 ∈ dom card)
7		sdomdom 8905	. . . . . . 7 ⊢ (𝐵 ≺ 𝑋 → 𝐵 ≼ 𝑋)
8	7	ad2antll 729	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐵 ≼ 𝑋)
9		numdom 9932	. . . . . 6 ⊢ ((𝑋 ∈ dom card ∧ 𝐵 ≼ 𝑋) → 𝐵 ∈ dom card)
10	6, 8, 9	syl2anc 584	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐵 ∈ dom card)
11		sdomdom 8905	. . . . . . 7 ⊢ (𝐴 ≺ 𝑋 → 𝐴 ≼ 𝑋)
12	11	ad2antrl 728	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐴 ≼ 𝑋)
13		numdom 9932	. . . . . 6 ⊢ ((𝑋 ∈ dom card ∧ 𝐴 ≼ 𝑋) → 𝐴 ∈ dom card)
14	6, 12, 13	syl2anc 584	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → 𝐴 ∈ dom card)
15		domtri2 9885	. . . . 5 ⊢ ((𝐵 ∈ dom card ∧ 𝐴 ∈ dom card) → (𝐵 ≼ 𝐴 ↔ ¬ 𝐴 ≺ 𝐵))
16	10, 14, 15	syl2anc 584	. . . 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 4109	. . . . . 6 ⊢ (𝐴 ∪ 𝐵) = (𝐵 ∪ 𝐴)
19		infunsdom1 10106	. . . . . 6 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐵 ≼ 𝐴 ∧ 𝐴 ≺ 𝑋)) → (𝐵 ∪ 𝐴) ≺ 𝑋)
20	18, 19	eqbrtrid 5127	. . . . 5 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐵 ≼ 𝐴 ∧ 𝐴 ≺ 𝑋)) → (𝐴 ∪ 𝐵) ≺ 𝑋)
21	20	anass1rs 655	. . . 4 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ 𝐴 ≺ 𝑋) ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≺ 𝑋)
22	21	adantlrr 721	. . 3 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≺ 𝑋)
23	17, 22	syldan 591	. 2 ⊢ ((((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) ∧ ¬ 𝐴 ≺ 𝐵) → (𝐴 ∪ 𝐵) ≺ 𝑋)
24	5, 23	pm2.61dan 812	1 ⊢ (((𝑋 ∈ dom card ∧ ω ≼ 𝑋) ∧ (𝐴 ≺ 𝑋 ∧ 𝐵 ≺ 𝑋)) → (𝐴 ∪ 𝐵) ≺ 𝑋)

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 206   ∧ wa 395   ∈ wcel 2109   ∪ cun 3901   class class class wbr 5092  dom cdm 5619  ωcom 7799   ≼ cdom 8870   ≺ csdm 8871  cardccrd 9831

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 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5218  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671  ax-inf2 9537

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rmo 3343  df-reu 3344  df-rab 3395  df-v 3438  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-pss 3923  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-int 4897  df-iun 4943  df-br 5093  df-opab 5155  df-mpt 5174  df-tr 5200  df-id 5514  df-eprel 5519  df-po 5527  df-so 5528  df-fr 5572  df-se 5573  df-we 5574  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-pred 6249  df-ord 6310  df-on 6311  df-lim 6312  df-suc 6313  df-iota 6438  df-fun 6484  df-fn 6485  df-f 6486  df-f1 6487  df-fo 6488  df-f1o 6489  df-fv 6490  df-isom 6491  df-riota 7306  df-ov 7352  df-om 7800  df-1st 7924  df-2nd 7925  df-frecs 8214  df-wrecs 8245  df-recs 8294  df-rdg 8332  df-1o 8388  df-2o 8389  df-er 8625  df-en 8873  df-dom 8874  df-sdom 8875  df-fin 8876  df-oi 9402  df-dju 9797  df-card 9835

This theorem is referenced by:  csdfil  23779