Theorem infxp 10136

Description: Absorption law for multiplication with an infinite cardinal. Equivalent to Proposition 10.41 of [TakeutiZaring] p. 95. (Contributed by NM, 28-Sep-2004.) (Revised by Mario Carneiro, 29-Apr-2015.)

Assertion

Ref	Expression
infxp	⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))

Proof of Theorem infxp

Step	Hyp	Ref	Expression
1		sdomdom 8927	. . 3 ⊢ (𝐵 ≺ 𝐴 → 𝐵 ≼ 𝐴)
2		infxpabs 10133	. . . . . 6 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → (𝐴 × 𝐵) ≈ 𝐴)
3		infunabs 10128	. . . . . . . . 9 ⊢ ((𝐴 ∈ dom card ∧ ω ≼ 𝐴 ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≈ 𝐴)
4	3	3expa 1119	. . . . . . . 8 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≈ 𝐴)
5	4	adantrl 717	. . . . . . 7 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → (𝐴 ∪ 𝐵) ≈ 𝐴)
6	5	ensymd 8952	. . . . . 6 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → 𝐴 ≈ (𝐴 ∪ 𝐵))
7		entr 8953	. . . . . 6 ⊢ (((𝐴 × 𝐵) ≈ 𝐴 ∧ 𝐴 ≈ (𝐴 ∪ 𝐵)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
8	2, 6, 7	syl2anc 585	. . . . 5 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
9	8	expr 456	. . . 4 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ 𝐵 ≠ ∅) → (𝐵 ≼ 𝐴 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
10	9	adantrl 717	. . 3 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐵 ≼ 𝐴 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
11	1, 10	syl5 34	. 2 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐵 ≺ 𝐴 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
12		domtri2 9913	. . . 4 ⊢ ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → (𝐴 ≼ 𝐵 ↔ ¬ 𝐵 ≺ 𝐴))
13	12	ad2ant2r 748	. . 3 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 ≼ 𝐵 ↔ ¬ 𝐵 ≺ 𝐴))
14		xpcomeng 9007	. . . . . 6 ⊢ ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → (𝐴 × 𝐵) ≈ (𝐵 × 𝐴))
15	14	ad2ant2r 748	. . . . 5 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 × 𝐵) ≈ (𝐵 × 𝐴))
16		simplrl 777	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐵 ∈ dom card)
17		domtr 8954	. . . . . . . 8 ⊢ ((ω ≼ 𝐴 ∧ 𝐴 ≼ 𝐵) → ω ≼ 𝐵)
18	17	ad4ant24 755	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → ω ≼ 𝐵)
19		infn0 9212	. . . . . . . 8 ⊢ (ω ≼ 𝐴 → 𝐴 ≠ ∅)
20	19	ad3antlr 732	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐴 ≠ ∅)
21		simpr 484	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐴 ≼ 𝐵)
22		infxpabs 10133	. . . . . . 7 ⊢ (((𝐵 ∈ dom card ∧ ω ≼ 𝐵) ∧ (𝐴 ≠ ∅ ∧ 𝐴 ≼ 𝐵)) → (𝐵 × 𝐴) ≈ 𝐵)
23	16, 18, 20, 21, 22	syl22anc 839	. . . . . 6 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐵 × 𝐴) ≈ 𝐵)
24		uncom 4098	. . . . . . . 8 ⊢ (𝐴 ∪ 𝐵) = (𝐵 ∪ 𝐴)
25		infunabs 10128	. . . . . . . . 9 ⊢ ((𝐵 ∈ dom card ∧ ω ≼ 𝐵 ∧ 𝐴 ≼ 𝐵) → (𝐵 ∪ 𝐴) ≈ 𝐵)
26	16, 18, 21, 25	syl3anc 1374	. . . . . . . 8 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐵 ∪ 𝐴) ≈ 𝐵)
27	24, 26	eqbrtrid 5120	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐴 ∪ 𝐵) ≈ 𝐵)
28	27	ensymd 8952	. . . . . 6 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐵 ≈ (𝐴 ∪ 𝐵))
29		entr 8953	. . . . . 6 ⊢ (((𝐵 × 𝐴) ≈ 𝐵 ∧ 𝐵 ≈ (𝐴 ∪ 𝐵)) → (𝐵 × 𝐴) ≈ (𝐴 ∪ 𝐵))
30	23, 28, 29	syl2anc 585	. . . . 5 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐵 × 𝐴) ≈ (𝐴 ∪ 𝐵))
31		entr 8953	. . . . 5 ⊢ (((𝐴 × 𝐵) ≈ (𝐵 × 𝐴) ∧ (𝐵 × 𝐴) ≈ (𝐴 ∪ 𝐵)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
32	15, 30, 31	syl2an2r 686	. . . 4 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
33	32	ex 412	. . 3 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 ≼ 𝐵 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
34	13, 33	sylbird 260	. 2 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (¬ 𝐵 ≺ 𝐴 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
35	11, 34	pm2.61d 179	1 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 206   ∧ wa 395   ∈ wcel 2114   ≠ wne 2932   ∪ cun 3887  ∅c0 4273   class class class wbr 5085   × cxp 5629  dom cdm 5631  ωcom 7817   ≈ cen 8890   ≼ 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:  alephmul  10501