Theorem infxp 8920

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 7869	. . 3 ⊢ (𝐵 ≺ 𝐴 → 𝐵 ≼ 𝐴)
2		infxpabs 8917	. . . . . 6 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → (𝐴 × 𝐵) ≈ 𝐴)
3		infunabs 8912	. . . . . . . . 9 ⊢ ((𝐴 ∈ dom card ∧ ω ≼ 𝐴 ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≈ 𝐴)
4	3	3expa 1257	. . . . . . . 8 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≈ 𝐴)
5	4	adantrl 748	. . . . . . 7 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → (𝐴 ∪ 𝐵) ≈ 𝐴)
6	5	ensymd 7893	. . . . . 6 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → 𝐴 ≈ (𝐴 ∪ 𝐵))
7		entr 7894	. . . . . 6 ⊢ (((𝐴 × 𝐵) ≈ 𝐴 ∧ 𝐴 ≈ (𝐴 ∪ 𝐵)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
8	2, 6, 7	syl2anc 691	. . . . 5 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
9	8	expr 641	. . . 4 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ 𝐵 ≠ ∅) → (𝐵 ≼ 𝐴 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
10	9	adantrl 748	. . 3 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐵 ≼ 𝐴 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
11	1, 10	syl5 33	. 2 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐵 ≺ 𝐴 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
12		domtri2 8698	. . . 4 ⊢ ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → (𝐴 ≼ 𝐵 ↔ ¬ 𝐵 ≺ 𝐴))
13	12	ad2ant2r 779	. . 3 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 ≼ 𝐵 ↔ ¬ 𝐵 ≺ 𝐴))
14		xpcomeng 7937	. . . . . . 7 ⊢ ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → (𝐴 × 𝐵) ≈ (𝐵 × 𝐴))
15	14	ad2ant2r 779	. . . . . 6 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 × 𝐵) ≈ (𝐵 × 𝐴))
16	15	adantr 480	. . . . 5 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐴 × 𝐵) ≈ (𝐵 × 𝐴))
17		simplrl 796	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐵 ∈ dom card)
18		simplr 788	. . . . . . . 8 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → ω ≼ 𝐴)
19		domtr 7895	. . . . . . . 8 ⊢ ((ω ≼ 𝐴 ∧ 𝐴 ≼ 𝐵) → ω ≼ 𝐵)
20	18, 19	sylan 487	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → ω ≼ 𝐵)
21		infn0 8107	. . . . . . . 8 ⊢ (ω ≼ 𝐴 → 𝐴 ≠ ∅)
22	21	ad3antlr 763	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐴 ≠ ∅)
23		simpr 476	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐴 ≼ 𝐵)
24		infxpabs 8917	. . . . . . 7 ⊢ (((𝐵 ∈ dom card ∧ ω ≼ 𝐵) ∧ (𝐴 ≠ ∅ ∧ 𝐴 ≼ 𝐵)) → (𝐵 × 𝐴) ≈ 𝐵)
25	17, 20, 22, 23, 24	syl22anc 1319	. . . . . 6 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐵 × 𝐴) ≈ 𝐵)
26		uncom 3719	. . . . . . . 8 ⊢ (𝐴 ∪ 𝐵) = (𝐵 ∪ 𝐴)
27		infunabs 8912	. . . . . . . . 9 ⊢ ((𝐵 ∈ dom card ∧ ω ≼ 𝐵 ∧ 𝐴 ≼ 𝐵) → (𝐵 ∪ 𝐴) ≈ 𝐵)
28	17, 20, 23, 27	syl3anc 1318	. . . . . . . 8 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐵 ∪ 𝐴) ≈ 𝐵)
29	26, 28	syl5eqbr 4618	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐴 ∪ 𝐵) ≈ 𝐵)
30	29	ensymd 7893	. . . . . 6 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐵 ≈ (𝐴 ∪ 𝐵))
31		entr 7894	. . . . . 6 ⊢ (((𝐵 × 𝐴) ≈ 𝐵 ∧ 𝐵 ≈ (𝐴 ∪ 𝐵)) → (𝐵 × 𝐴) ≈ (𝐴 ∪ 𝐵))
32	25, 30, 31	syl2anc 691	. . . . 5 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐵 × 𝐴) ≈ (𝐴 ∪ 𝐵))
33		entr 7894	. . . . 5 ⊢ (((𝐴 × 𝐵) ≈ (𝐵 × 𝐴) ∧ (𝐵 × 𝐴) ≈ (𝐴 ∪ 𝐵)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
34	16, 32, 33	syl2anc 691	. . . 4 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
35	34	ex 449	. . 3 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 ≼ 𝐵 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
36	13, 35	sylbird 249	. 2 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (¬ 𝐵 ≺ 𝐴 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
37	11, 36	pm2.61d 169	1 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∧ wa 383   ∈ wcel 1977   ≠ wne 2780   ∪ cun 3538  ∅c0 3874   class class class wbr 4583   × cxp 5036  dom cdm 5038  ωcom 6957   ≈ cen 7838   ≼ cdom 7839   ≺ csdm 7840  cardccrd 8644

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-inf2 8421

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-se 4998  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-isom 5813  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-2o 7448  df-oadd 7451  df-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-oi 8298  df-card 8648  df-cda 8873

This theorem is referenced by:  alephmul  9279