Theorem omword2 7699

Description: An ordinal is less than or equal to its product with another. (Contributed by NM, 21-Dec-2004.)

Assertion

Ref	Expression
omword2	⊢ (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ ∅ ∈ 𝐵) → 𝐴 ⊆ (𝐵 ·𝑜 𝐴))

Proof of Theorem omword2

Step	Hyp	Ref	Expression
1		om1r 7668	. . 3 ⊢ (𝐴 ∈ On → (1𝑜 ·𝑜 𝐴) = 𝐴)
2	1	ad2antrr 762	. 2 ⊢ (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ ∅ ∈ 𝐵) → (1𝑜 ·𝑜 𝐴) = 𝐴)
3		eloni 5771	. . . . 5 ⊢ (𝐵 ∈ On → Ord 𝐵)
4		ordgt0ge1 7622	. . . . . 6 ⊢ (Ord 𝐵 → (∅ ∈ 𝐵 ↔ 1𝑜 ⊆ 𝐵))
5	4	biimpa 500	. . . . 5 ⊢ ((Ord 𝐵 ∧ ∅ ∈ 𝐵) → 1𝑜 ⊆ 𝐵)
6	3, 5	sylan 487	. . . 4 ⊢ ((𝐵 ∈ On ∧ ∅ ∈ 𝐵) → 1𝑜 ⊆ 𝐵)
7	6	adantll 750	. . 3 ⊢ (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ ∅ ∈ 𝐵) → 1𝑜 ⊆ 𝐵)
8		1on 7612	. . . . . 6 ⊢ 1𝑜 ∈ On
9		omwordri 7697	. . . . . 6 ⊢ ((1𝑜 ∈ On ∧ 𝐵 ∈ On ∧ 𝐴 ∈ On) → (1𝑜 ⊆ 𝐵 → (1𝑜 ·𝑜 𝐴) ⊆ (𝐵 ·𝑜 𝐴)))
10	8, 9	mp3an1 1451	. . . . 5 ⊢ ((𝐵 ∈ On ∧ 𝐴 ∈ On) → (1𝑜 ⊆ 𝐵 → (1𝑜 ·𝑜 𝐴) ⊆ (𝐵 ·𝑜 𝐴)))
11	10	ancoms 468	. . . 4 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (1𝑜 ⊆ 𝐵 → (1𝑜 ·𝑜 𝐴) ⊆ (𝐵 ·𝑜 𝐴)))
12	11	adantr 480	. . 3 ⊢ (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ ∅ ∈ 𝐵) → (1𝑜 ⊆ 𝐵 → (1𝑜 ·𝑜 𝐴) ⊆ (𝐵 ·𝑜 𝐴)))
13	7, 12	mpd 15	. 2 ⊢ (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ ∅ ∈ 𝐵) → (1𝑜 ·𝑜 𝐴) ⊆ (𝐵 ·𝑜 𝐴))
14	2, 13	eqsstr3d 3673	1 ⊢ (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ ∅ ∈ 𝐵) → 𝐴 ⊆ (𝐵 ·𝑜 𝐴))

Syntax hints:   → wi 4   ∧ wa 383   = wceq 1523   ∈ wcel 2030   ⊆ wss 3607  ∅c0 3948  Ord word 5760  Oncon0 5761  (class class class)co 6690  1_𝑜c1o 7598   ·_𝑜 comu 7603

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991

This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-om 7108  df-1st 7210  df-2nd 7211  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-1o 7605  df-oadd 7609  df-omul 7610

This theorem is referenced by:  omeulem1  7707  omabslem  7771  omabs  7772