Theorem infxp 9631

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 8531	. . 3 ⊢ (𝐵 ≺ 𝐴 → 𝐵 ≼ 𝐴)
2		infxpabs 9628	. . . . . 6 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → (𝐴 × 𝐵) ≈ 𝐴)
3		infunabs 9623	. . . . . . . . 9 ⊢ ((𝐴 ∈ dom card ∧ ω ≼ 𝐴 ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≈ 𝐴)
4	3	3expa 1114	. . . . . . . 8 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ 𝐵 ≼ 𝐴) → (𝐴 ∪ 𝐵) ≈ 𝐴)
5	4	adantrl 714	. . . . . . 7 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → (𝐴 ∪ 𝐵) ≈ 𝐴)
6	5	ensymd 8554	. . . . . 6 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → 𝐴 ≈ (𝐴 ∪ 𝐵))
7		entr 8555	. . . . . 6 ⊢ (((𝐴 × 𝐵) ≈ 𝐴 ∧ 𝐴 ≈ (𝐴 ∪ 𝐵)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
8	2, 6, 7	syl2anc 586	. . . . 5 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ≠ ∅ ∧ 𝐵 ≼ 𝐴)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
9	8	expr 459	. . . 4 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ 𝐵 ≠ ∅) → (𝐵 ≼ 𝐴 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
10	9	adantrl 714	. . 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 9412	. . . 4 ⊢ ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → (𝐴 ≼ 𝐵 ↔ ¬ 𝐵 ≺ 𝐴))
13	12	ad2ant2r 745	. . 3 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 ≼ 𝐵 ↔ ¬ 𝐵 ≺ 𝐴))
14		xpcomeng 8603	. . . . . 6 ⊢ ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → (𝐴 × 𝐵) ≈ (𝐵 × 𝐴))
15	14	ad2ant2r 745	. . . . 5 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 × 𝐵) ≈ (𝐵 × 𝐴))
16		simplrl 775	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐵 ∈ dom card)
17		domtr 8556	. . . . . . . 8 ⊢ ((ω ≼ 𝐴 ∧ 𝐴 ≼ 𝐵) → ω ≼ 𝐵)
18	17	ad4ant24 752	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → ω ≼ 𝐵)
19		infn0 8774	. . . . . . . 8 ⊢ (ω ≼ 𝐴 → 𝐴 ≠ ∅)
20	19	ad3antlr 729	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐴 ≠ ∅)
21		simpr 487	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐴 ≼ 𝐵)
22		infxpabs 9628	. . . . . . 7 ⊢ (((𝐵 ∈ dom card ∧ ω ≼ 𝐵) ∧ (𝐴 ≠ ∅ ∧ 𝐴 ≼ 𝐵)) → (𝐵 × 𝐴) ≈ 𝐵)
23	16, 18, 20, 21, 22	syl22anc 836	. . . . . 6 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐵 × 𝐴) ≈ 𝐵)
24		uncom 4129	. . . . . . . 8 ⊢ (𝐴 ∪ 𝐵) = (𝐵 ∪ 𝐴)
25		infunabs 9623	. . . . . . . . 9 ⊢ ((𝐵 ∈ dom card ∧ ω ≼ 𝐵 ∧ 𝐴 ≼ 𝐵) → (𝐵 ∪ 𝐴) ≈ 𝐵)
26	16, 18, 21, 25	syl3anc 1367	. . . . . . . 8 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐵 ∪ 𝐴) ≈ 𝐵)
27	24, 26	eqbrtrid 5094	. . . . . . 7 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐴 ∪ 𝐵) ≈ 𝐵)
28	27	ensymd 8554	. . . . . 6 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → 𝐵 ≈ (𝐴 ∪ 𝐵))
29		entr 8555	. . . . . 6 ⊢ (((𝐵 × 𝐴) ≈ 𝐵 ∧ 𝐵 ≈ (𝐴 ∪ 𝐵)) → (𝐵 × 𝐴) ≈ (𝐴 ∪ 𝐵))
30	23, 28, 29	syl2anc 586	. . . . 5 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐵 × 𝐴) ≈ (𝐴 ∪ 𝐵))
31		entr 8555	. . . . 5 ⊢ (((𝐴 × 𝐵) ≈ (𝐵 × 𝐴) ∧ (𝐵 × 𝐴) ≈ (𝐴 ∪ 𝐵)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
32	15, 30, 31	syl2an2r 683	. . . 4 ⊢ ((((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) ∧ 𝐴 ≼ 𝐵) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))
33	32	ex 415	. . 3 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 ≼ 𝐵 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
34	13, 33	sylbird 262	. 2 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (¬ 𝐵 ≺ 𝐴 → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵)))
35	11, 34	pm2.61d 181	1 ⊢ (((𝐴 ∈ dom card ∧ ω ≼ 𝐴) ∧ (𝐵 ∈ dom card ∧ 𝐵 ≠ ∅)) → (𝐴 × 𝐵) ≈ (𝐴 ∪ 𝐵))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 208   ∧ wa 398   ∈ wcel 2110   ≠ wne 3016   ∪ cun 3934  ∅c0 4291   class class class wbr 5059   × cxp 5548  dom cdm 5550  ωcom 7574   ≈ cen 8500   ≼ cdom 8501   ≺ csdm 8502  cardccrd 9358

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 2156  ax-12 2172  ax-ext 2793  ax-rep 5183  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5322  ax-un 7455  ax-inf2 9098

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 3497  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4562  df-pr 4564  df-tp 4566  df-op 4568  df-uni 4833  df-int 4870  df-iun 4914  df-br 5060  df-opab 5122  df-mpt 5140  df-tr 5166  df-id 5455  df-eprel 5460  df-po 5469  df-so 5470  df-fr 5509  df-se 5510  df-we 5511  df-xp 5556  df-rel 5557  df-cnv 5558  df-co 5559  df-dm 5560  df-rn 5561  df-res 5562  df-ima 5563  df-pred 6143  df-ord 6189  df-on 6190  df-lim 6191  df-suc 6192  df-iota 6309  df-fun 6352  df-fn 6353  df-f 6354  df-f1 6355  df-fo 6356  df-f1o 6357  df-fv 6358  df-isom 6359  df-riota 7108  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7575  df-1st 7683  df-2nd 7684  df-wrecs 7941  df-recs 8002  df-rdg 8040  df-1o 8096  df-2o 8097  df-oadd 8100  df-er 8283  df-en 8504  df-dom 8505  df-sdom 8506  df-fin 8507  df-oi 8968  df-dju 9324  df-card 9362

This theorem is referenced by:  alephmul  9994