Theorem omword2 7654

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 7623	. . 3 ⊢ (𝐴 ∈ On → (1𝑜 ·𝑜 𝐴) = 𝐴)
2	1	ad2antrr 762	. 2 ⊢ (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ ∅ ∈ 𝐵) → (1𝑜 ·𝑜 𝐴) = 𝐴)
3		eloni 5733	. . . . 5 ⊢ (𝐵 ∈ On → Ord 𝐵)
4		ordgt0ge1 7577	. . . . . 6 ⊢ (Ord 𝐵 → (∅ ∈ 𝐵 ↔ 1𝑜 ⊆ 𝐵))
5	4	biimpa 501	. . . . 5 ⊢ ((Ord 𝐵 ∧ ∅ ∈ 𝐵) → 1𝑜 ⊆ 𝐵)
6	3, 5	sylan 488	. . . 4 ⊢ ((𝐵 ∈ On ∧ ∅ ∈ 𝐵) → 1𝑜 ⊆ 𝐵)
7	6	adantll 750	. . 3 ⊢ (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ ∅ ∈ 𝐵) → 1𝑜 ⊆ 𝐵)
8		1on 7567	. . . . . 6 ⊢ 1𝑜 ∈ On
9		omwordri 7652	. . . . . 6 ⊢ ((1𝑜 ∈ On ∧ 𝐵 ∈ On ∧ 𝐴 ∈ On) → (1𝑜 ⊆ 𝐵 → (1𝑜 ·𝑜 𝐴) ⊆ (𝐵 ·𝑜 𝐴)))
10	8, 9	mp3an1 1411	. . . . 5 ⊢ ((𝐵 ∈ On ∧ 𝐴 ∈ On) → (1𝑜 ⊆ 𝐵 → (1𝑜 ·𝑜 𝐴) ⊆ (𝐵 ·𝑜 𝐴)))
11	10	ancoms 469	. . . 4 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (1𝑜 ⊆ 𝐵 → (1𝑜 ·𝑜 𝐴) ⊆ (𝐵 ·𝑜 𝐴)))
12	11	adantr 481	. . 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 3640	1 ⊢ (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ ∅ ∈ 𝐵) → 𝐴 ⊆ (𝐵 ·𝑜 𝐴))

Syntax hints:   → wi 4   ∧ wa 384   = wceq 1483   ∈ wcel 1990   ⊆ wss 3574  ∅c0 3915  Ord word 5722  Oncon0 5723  (class class class)co 6650  1_𝑜c1o 7553   ·_𝑜 comu 7558

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-omul 7565

This theorem is referenced by:  omeulem1  7662  omabslem  7726  omabs  7727